CN111561490A - A piston travel limit mechanism - Google Patents

Abstract

A piston stroke limiting mechanism belongs to the technical field of stroke limiting of hydraulic fastening tool piston overtravel. The scheme is as follows: the method comprises the following steps: the cylinder body comprises a plug A, a spring, a steel ball, a limiting pin and a limiting module, wherein the plug A is arranged in the limiting module, one end of the spring is connected with the plug A, the other end of the spring is connected with the steel ball, one end of the limiting pin is connected with the steel ball, and the other end of the limiting pin is connected with the cylinder body. The invention has the advantages that because the piston stroke limiting mechanism is externally arranged, if the mechanism is damaged, the mechanism is only required to be disassembled and replaced by a new stroke limiting mechanism, and cylinder disassembly is avoided. The working time is saved; the piston stroke limiting mechanism is arranged outside, so that the sealing is not influenced, and the service life of the sealing is ensured.

Description

A piston travel limit mechanism

technical field

The invention belongs to the technical field of stroke limit of hydraulic fastening tool piston overtravel, and in particular relates to a piston stroke limit mechanism.

Background technique

At present, the solutions for the stroke limit of the bolt tensioner used in hydraulic bolt tightening tools generally adopt several built-in solutions. Such a stroke limit will have the following problems:

The built-in piston stroke limit generally adds a stroke limit mechanism inside the cylinder or grooves in the cylinder wall. Choosing to add a stroke limit inside the cylinder will require repeated disassembly of the cylinder during the debugging process, which is cumbersome and may cause some problems. Unnecessary problems; if the groove is selected inside the cylinder, the damage to the seal will be relatively large and the life of the seal will be affected.

SUMMARY OF THE INVENTION

In order to solve the above-mentioned problems in the prior art, the present invention proposes a piston stroke limit mechanism, which externally places the stroke limit mechanism, which is convenient for replacement, avoids disassembly of the cylinder, saves working time, and ensures the life of the seal .

The technical solution is as follows:

A piston stroke limit mechanism, comprising: a plug A, a spring, a steel ball, a limit pin, and a limit module, the plug A is arranged in the limit module, and one end of the spring is connected to the plug A connection, the other end is connected with the steel ball, one end of the limit pin is connected with the steel ball, and the other end is connected with the cylinder.

Further, a plug B for sealing the oil passage is also included, and the plug B is arranged below the limit module.

Further, it also includes a combined gasket for sealing the connection between the limit module and the cylinder, and the combined gasket is placed in the sealing groove of the limit module.

Further, it also includes a hexagon socket head bolt, which is fixed on the cylinder body through the piston stroke limit mechanism.

Compared with the existing piston stroke limit mechanism, the piston stroke limit mechanism of the present invention has the following beneficial effects:

1. Since the piston stroke limit mechanism is externally located in the present invention, if the mechanism is damaged, it is only necessary to remove the mechanism and replace with a new stroke limit mechanism to avoid dismantling the cylinder. Save working time.

2. Since the piston stroke limit mechanism is externally placed in the present invention, it will not have any influence on the seal, thus ensuring the life of the seal.

Description of drawings

Fig. 1 is the internal structure schematic diagram of the present invention;

Figure 2 is an isometric view of the present invention;

The reference signs in the figure are as follows: 1-plug, 2-spring, 3-steel ball, 4-limit pin, 5-limit module, 6-plug, 7-combination washer, 8-hexagon socket head bolt, 9- Piston, 10-cylinder.

Detailed ways

The piston stroke limiting mechanism will be further described below with reference to the accompanying drawings 1-2.

A piston stroke limit mechanism, comprising: a plug A1, a spring 2, a steel ball 3, a limit pin 4, and a limit module 5, the plug A1 is arranged in the limit module 5, and one end of the spring 2 It is connected to the plug A1, the other end is connected to the steel ball 3, one end of the limit pin 4 is connected to the steel ball 3, and the other end is connected to the piston 9.

Further, a plug B6 for sealing the oil passage is also included, and the plug B6 is arranged below the limiting module 5 .

Further, it also includes a combined gasket 7 for sealing the connection between the limit module and the cylinder, and the combined gasket 7 is placed in the sealing groove of the limit module 5 .

Further, it also includes a hexagon socket head bolt 8, which is fixed on the cylinder block 10 through the piston stroke limit mechanism.

The spring 2 in the limit module 5 attaches the steel ball 3 to the conical surface, and the conical surface refers to the surface on the side of the cylinder body 10 in the hole where the spring 2 of the limit module 5 is located, and the hydraulic oil in the oil chamber of the oil cylinder. Entering the limit module 5 through the oil passage, under the condition of pressure, the steel ball 3 and the conical surface are sealed, the two ends of the oil passage are sealed with plugs, and the limit module 5 and the cylinder block 10 are sealed by the combined gasket 7, so that the piston The stroke limit mechanism forms a sealed state as a whole, which does not affect the normal movement of the piston.

When the piston moves beyond the predetermined stroke, the inclined surface of the surface of the piston 9 contacts with the limit pin 4 in the piston stroke limit mechanism and causes the limit pin 4 to continue to move to the left. When the limit pin 4 contacts the steel ball 3, it breaks the In the sealing state formed by the steel ball 3 and the cone surface, the hydraulic oil leaks from here, and the oil pressure in the oil chamber drops instantly, warning that the piston 9 has reached the maximum stroke, so as to avoid the cylinder burst due to excessive pressure exceeding the stroke and damage the seal.

The assembling method of the present invention is as follows:

A. Place the steel ball 3 and the spring 2 in the hole of the limit module 5 in turn, and use the plug A1 to compress the spring 2 to make the steel ball 3 fit the tapered surface, and the plug A1 seals the oil passage at the same time;

B. Seal the oil passage with plug B6;

C. Place the combined gasket 7 in the sealing groove of the limit module 5;

D. Place the limit pin 4 at the opening of the cylinder;

E. Use two hexagon socket head cap bolts 8 to fix the piston stroke limit mechanism on the cylinder block 10 (note that the limit pin 4 should be in the limit module 5 and the opening of the cylinder block 10 at the same time).

The above is only a preferred embodiment of the present invention, but the protection scope of the present invention is not limited to this. The equivalent replacement or change of the inventive concept thereof shall be included within the protection scope of the present invention.

Claims (4)

1. A piston stroke limit mechanism, characterized in that it comprises: a plug A (1), a spring (2), a steel ball (3), a limit pin (4), and a limit module (5), the block The head A (1) is arranged in the limit module (5), one end of the spring (2) is connected with the plug A (1), and the other end is connected with the steel ball (3), the limit One end of the pin (4) is connected with the steel ball (3), and the other end is connected with the cylinder body (10). 2 . The piston stroke limit mechanism according to claim 1 , further comprising a plug B ( 6 ) for sealing the oil passage, and the plug B ( 6 ) is arranged on the limit module ( 2 . 5) Below. 3. The piston stroke limit mechanism according to claim 1, further comprising a combined gasket (7) for sealing the connection between the limit module and the cylinder, the combined gasket (7) being placed on the in the sealing groove of the limit module (5). 4 . The piston stroke limit mechanism according to claim 1 , further comprising a hexagon socket head cap bolt (8), the inner hexagon socket head cap bolt (8) passing through the piston stroke limit mechanism and being fixed on the cylinder. 5 . on the body (10).

Images