What is the general inclination of the latch diagonal tongue

Generally, a kind of dark lock is installed on the classroom door, and this dark lock is made up of shell A, skeleton B, spring C (stiffness coefficient K), deadbolt D (inclination angle = 45 °), lock groove E, and connecting rod, lock head and other components, as shown in Figure 1 The friction factor between the side of the deadbolt D and the shell A and the lock groove E are all , and the maximum static friction force fm is obtained by FM = N (n is positive pressure) Once after school, when a student is ready to close the door, no matter how much force is used, the door cannot be closed (this phenomenon is called self-locking) The top view of the state of the dark lock at this moment is shown in Figure 2, p is the contact point between the deadbolt d and the lock groove e, and the spring is shortened by x due to compression

Judging from the situation, it should be that there is a problem with the spring of the oblique tongue in the lock body. You can remove the lock body and see if it is **stuck, under normal circumstances, it is easy to get stuck is that the oblique tongue sticks out of that place and there is a gap on the lock body, which is basically stuck there. If not, maybe the internal structure is a thing.

It is estimated that the lock body should be replaced, if it can still be used, it is not recommended to replace the lock body, it is very troublesome to change. Of course, there is also a situation where the mechanical transmission fails due to the lock cylinder being too tight, so it should be better to apply a little stone grinding lubricant to the lock cylinder. Did I help you?

According to Article 1 of the Code for the Design of Building Foundations.

For the local inclination of the masonry load-bearing structure foundation, medium and low compressibility soil is used, and high compressibility soil is used.

For the overall inclination of multi-storey and high-rise buildings, the building height is less than or equal to 24 meters.

The so-called tilt here refers to the ratio of the settlement difference between the two ends of the foundation inclination direction to its distance.

This is related to the specific layout of the structure, but according to the provisions, the maximum inclination angle of a six-storey building cannot exceed the arctg (degrees).

<>1) Let the maximum collapsed static friction on the lower surface of the deadbolt D be <> positive pressure is n, the positive pressure of the lower surface is f, and the elastic force is kx, which is determined by the equilibrium condition:

2 points) <

2 points) and <>

(2 points) Solve the above equation together: <

2 points) <

2) Let n tend to infinity, then there is:

2 points) solution: <

2 marks) This question examines the application of Newton's second law, the maximum static friction on the lower surface of the deadbolt D is the effect, the maximum static friction force on the deadbolt D is the maximum static friction force of the locking groove E, the deadbolt is used as the research object to analyze the force, the force is decomposed after the hail accompanies the oak in the Cartesian coordinate system, and the positive pressure can be obtained from the balance of the horizontal and vertical forces, and when n tends to infinity, there is a <>

So as to obtain the magnitude of the kinetic friction factor.

Pro, don't judge your lock at first may have one of two problems, one is that the rebound function between the lock baffle and the lock body is blocked, which is generally a problem with the lock body, you need to remove the lock body to see whether the lock body diagonal tongue is damaged with the lock body; Second, I think it's unlikely, but it's also possible that the inside of your lock cylinder should be too tight, so it is very laborious to drive the diagonal tongue belt when you twist, and the solution is to change the lock cylinder or inject some graphite (or 2B pencil lead powder) into the lock cylinder. You can try it.

The deadbolt of the lock cylinder of the anti-theft door is very tight, you are sure.

Du must be this part of the tight, anti-theft door a dao lock cylinder control.

From the top of the door version to the lower part of the door up to two meters of connecting rod, as well as the deadbolt on the side of the door, any part of the flexible, you will feel that the deadbolt lock cylinder is tight, if it is a new anti-theft door, it is recommended that the manufacturer to deal with it, if it is an old anti-theft door, that is, the lubrication part is enough, sewing oil, pencil lead powder, find a way to pour it into it can play a lubricating role, to each part to go up. Hope it works for you.

The lock needs to be lubricated and maintained frequently, otherwise it will be difficult to open, rust, or even screw the key, or the internal lock block will be stuck and cannot be opened.

There are two situations in this way, one is the problem of installation, which is caused by the installation and debugging in place; Second, after the installation of the anti-theft door, the door leaf and the door frame are impacted in the case of anti-locking, resulting in the deformation of the door lock.

From your love for this.

Judging by the situation, it is very good.

Bai can be neither, but the problem of the anti-theft door itself, because the domestic anti-theft doors are basically made of metal DAO, are relatively heavy, so the door will easily cause the door to sag after a period of use, which directly leads to the situation that the door lock cannot be closed when the door is closed normally.

There is another situation, that is, the anti-theft door is not standard when it is installed, which causes the door frame to be squeezed badly and causes deformation, so the above situation occurs.

It is recommended that you can test it like this: in the state of the door open, test it with a key or handle, whether it is open and closed (insert it into the lock cylinder with a key and twist) laborious, if it is laborious, you can judge that it is a problem with the lock, if it is not laborious, if it is normal, then it is a problem with the door, and the door needs to be readjusted.

Locks are required to be constantly lubricated.

Maintenance of bai, otherwise it will be difficult to open, rusty, or even screw the du key, zhi or the internal lock block is stuck and cannot be opened.

Most of the well-known lock factories such as Esdao Cora use fully synthetic lock lubricants from Hotolube or Kluber. Fully synthetic base oil production, clear and transparent, colorless and odorless, low temperature resistance, no dust. Tao is full of 30 ml needle-nosed small oil bottles, drop a few drops, easy to use.

The maintenance interval is six months.

Mineral oil should not be used because it is highly viscous and tends to get dirty. It is also not suitable to use pencil end or black graphite lubrication, which cannot lubricate the internal parts, and there will be heavy metal and color pollution.

Customize a long deadbolt.

Replace it with a new, larger lock.

The deadbolt is a very figurative word, and if you think of the side of the door with the lock as a mouth, then the deadbolt does spit in and out like a tongue.

There are many kinds of deadbolts, including oblique tongues, square tongues, anti-saw deadbolts, double-hook deadbolts, etc., and the lock cylinders are also divided into single deadbolt locks and multi-point deadbolts through the number of deadbolts.

As with other technological products, the deadbolt has evolved with the times.

The earliest common thing we are common is the oblique tongue, the inclined design of the oblique tongue and its internal spring parts are completely for the convenience of closing the door, but because the structure is also convenient for "opening the door", we have used the membership card to open a single lock (oblique) tongue door lock. The structure of the oblique tongue is too easy to crack, therefore, people invented the square tongue.

Unlike oblique tongues, square tongues do not contain spring parts, so they cannot be ejected automatically and are not indented by external forces. The square tongue is controlled by the action of opening the door and locking the door, and its fixation is strong, and because of this characteristic, we must make the square tongue work through operation. This is why most of the external door locks in China now use the combination of oblique tongue and square tongue.

There is another kind of anti-saw deadbolt, the anti-sawing deadbolt is through its sturdy material and internal rotating deadbolt structure to increase the time of the saw deadbolt, the anti-sawing deadbolt of the Probuck fingerprint lock is resistant to the chainsaw time of at least 3 hours, which greatly increases the "difficulty of attacking" the thief.

The main differences are, different structure, different operability, different safety, and different applicability, as follows:

First, the structure is different.

1. Double tongue lock.

There are two deadbolts, square tongue and oblique tongue, which are usually divided into three types: single-live mortise door lock, double-active mortise door lock and quick-open mortise door lock according to the function of the handle. Single-active means that the handle is fixed on the outdoor side, the indoor side can be pressed down to open the oblique tongue, and double-active means that the handle on both sides can be pressed down to open the oblique tongue; Quick opening means that the outdoor and indoor handles can be lifted and locked.

2. Single tongue lock.

There is only one bevel.

The lockhouse is equipped with a pair of handles, with a lock cylinder on one side and a knob on the handle on the interior side to lock the door.

Second, the operability is different.

1. Double tongue lock.

The outside and inside of the door are opened with a key.

2. Single tongue lock.

The outside of the door is opened with a key, and the inside of the door is opened with a handle (or knob).

Third, the security is different.

1. Double tongue lock.

Secrecy is higher than monolature locks, thieves can not open without a key after entering, and most of them also have a defensive function, as long as there is no key to indent the deadbolt, use a common tool, such as a screwdriver.

Pliers and hammers also cannot remove the lock.

2. Single tongue lock.

It has the characteristics of strong confidentiality outside the door, convenient operation inside the door, and low security.

Fourth, the applicability is different.

1. Double tongue lock.

It is suitable for installation in indoor suit doors, security doors, and defensive places.

2. Single tongue lock.

It is often used on office doors or indoor doors at home, especially for emergency situations such as fire prevention.

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The main differences between a double tongue lock and a single tongue lock are as follows:

1. The number of deadbolts is different.

The double tongue lock has two deadbolts, including an oblique tongue and a square tongue. The single tongue generally has only one oblique tongue, and there are two specifications, 50 and 1500px, which refers to the distance between the lining plate and the square hole of the lock body.

2. It is convenient to install and has different degrees.

The installation of double tongue locks is more time-consuming, and the possibility of the master's choice is small when decorating. The monolingual lock body is easy to install, and the general master will choose the monolinge for fear of trouble.

3. ** is different.

The double snake lock body is larger, and a good square tongue is composed of tungsten steel bars and carbon steel, and its ** is generally more expensive, while the single tongue lock is relatively cheap.

4. The safety performance is different.

The material of the double tongue lock is well selected, and the anti-theft performance is relatively good, and it is generally locked with the door. The monolat lock is mainly used in bathroom door locks, and is the most used in engineering, but it is the most unreliable and easy to destroy.

<> "The picture above is a double tongue, and the picture below is a single tongue.

The handle can be moved when the tongue is locked, and the handle cannot be moved when the tongue is locked.

The binlingual lock is longer and the monolingual lock is shorter.

The safety of the lock is in the cylinder, and it has little to do with the number of deadbolts! For details, you can read a detailed introduction in the search "Anhui Zhi'an Security Technology"!