Repair type fixed piston of hydraulic support advancing jack

Abstract

The utility model discloses a repair type fixed piston of a hydraulic support pushing jack, which belongs to the technical field of mining mechanical equipment and comprises a cylinder body, a piston rod positioned in the cylinder body and arranged along the length direction, and a piston head mounted at the end part of the piston rod, first external threads are arranged on the outer side of the first stepped groove away from the inner end of the cylinder body. The first stepped groove and the second stepped groove are formed in the end of the piston rod, the first external threads are formed in the end of the first stepped groove, the second external threads are formed in the end of the second stepped groove, meanwhile, the annular grooves are formed in the two ends of the piston head, and the piston is used in cooperation with the internal thread disc, the insertion sleeve and the fixing nut. The piston head is positioned in an extrusion mode, no installation gap is generated on the end face of the piston head, the sealing effect is improved, the stroke of the hydraulic jack is not changed, and practicability is higher.

Description

Technical Field

[0001] The utility model relates to a repaired fixed piston, in particular to a repaired fixed piston for a hydraulic support push jack, belonging to the technical field of mining machinery equipment. Background Art

[0002] In the prior art, as disclosed in the utility model with the application number 201920510396.2, a repaired fixed piston for a hydraulic support push jack is provided. In order to solve the problems that the piston head slides on the piston rod, the requirement for the dynamic seal inside the piston is relatively high, and the seal is easily damaged, resulting in liquid leakage between the upper and lower chambers of the push jack, and it is very inconvenient to replace the push jack underground in the mine. The structure of the half-ring, the first annular groove and the second annular groove is simple, which is convenient for processing and installation. Or a bevel is processed at one end of the piston head close to the cylinder block, and the piston head is fixed by welding. The operation is also very simple, and the stroke of the hydraulic jack is not changed, which does not affect the use of the hydraulic jack, greatly saving the cost.

[0003] The similar applications currently still have deficiencies:

[0004] By the way of symmetrically clamping two groups of half-rings inside the first annular groove and the second annular groove to limit the piston head, although the position of the piston head can be fixed, due to processing errors, during the clamping process of the half-rings, gaps are likely to appear at the ends, affecting the sealing performance between the piston head and the piston rod. And the welding fixation method cannot be disassembled. When it is damaged, it needs to be replaced entirely, and the parts cannot be reused, increasing the use cost;

[0005] Therefore, a repaired fixed piston for a hydraulic support push jack is designed to optimize the above problems. Content of the Utility Model

[0006] The main purpose of the utility model is to provide a repaired fixed piston for a hydraulic support push jack. By opening a first stepped groove and a second stepped groove at the end of the piston rod, a first external thread is opened at the end of the first stepped groove, and a second external thread is provided at the end of the second stepped groove. At the same time, annular grooves are opened at both ends of the piston head, and then used in cooperation with an internal thread disc, an insertion sleeve and a fixing nut. The piston head is positioned by extrusion, no installation gap will be generated on the end face of the piston head, the sealing effect is improved, and the stroke of the hydraulic jack will not be changed, with higher practicability. By opening insertion holes at the relative positions of the end face of the internal thread disc and the piston head, and inserting and installing positioning insertion rods between the insertion holes, after the piston head is installed, it will not rotate, ensuring the stability of the installation.

[0007] The purpose of the utility model can be achieved by adopting the following technical solutions:

[0008] The repaired fixed piston of the hydraulic support pushing jack includes a cylinder block, a piston rod arranged inside the cylinder block along the length direction, and a piston head installed at the end of the piston rod. A first stepped groove is opened at the end of the piston rod. A first external thread is provided at the outer side of the first stepped groove away from the inner end of the cylinder block. A second stepped groove is opened at the outer side of the first stepped groove close to the inner end of the cylinder block. A second external thread is provided at the outer side of the second stepped groove away from the inner end of the cylinder block. An internal thread disc is threadedly installed at the outer side of the first external thread. A piston head is sleeved and installed at the outer side of the first stepped groove. Annular grooves are opened at both ends of the piston head. The internal thread disc is stuck inside the annular groove at the end of the piston head. A socket is sleeved at the outer side of the first stepped groove, and the outer side surface of the socket fits with the inner side of the piston head. The end of the socket is stuck inside the annular groove at one end of the piston head away from the internal thread disc. A fixing nut that squeezes the socket is threadedly installed at the outer side of the second external thread.

[0009] Preferably: The inner side edge of the fixing nut fits on the end faces of the piston head and the socket, and covers the annular groove.

[0010] Preferably: The outer end face of the internal thread disc and the outer end face of the socket are respectively flush with both ends of the piston head.

[0011] Preferably: A limiting groove is circumferentially opened on the inner side of the socket, and a sealing ring is provided inside the limiting groove.

[0012] Preferably: The inner end face of the socket fits with the surface of the internal thread disc, and both the end face of the socket and the side edge of the internal thread disc are smooth planes.

[0013] Preferably: Insertion holes are oppositely opened on the fitting surface inside the annular groove of the internal thread disc, and a positioning insertion rod is inserted between the insertion holes.

[0014] Preferably: The insertion holes are annularly and arrayedly distributed on the outer side of the internal thread disc, and the included angle between adjacent insertion holes is ninety degrees.

[0015] The beneficial effects of the present utility model are as follows:

[0016] The repaired fixed piston of the hydraulic support pushing jack provided by the present utility model, by opening a first stepped groove and a second stepped groove at the end of the piston rod, opening a first external thread at the end of the first stepped groove, and providing a second external thread at the end of the second stepped groove, while opening annular grooves at both ends of the piston head, and then cooperating with the internal thread disc, the socket and the fixing nut for use, positioning the piston head by an extrusion method, there will be no installation gap on the end face of the piston head, improving the sealing effect, and also not changing the stroke of the hydraulic jack, with higher practicability;

[0017] By providing insertion holes at the relative position of the end face between the internal thread disc and the piston head, and inserting and installing positioning rods between the insertion holes, rotation will not occur after the piston head is installed, ensuring the stability of the installation. Brief Description of the Drawings

[0018] Figure 1 is the front view cross-sectional view of the present utility model;

[0019] Figure 2 is the end view of the piston rod of the present utility model;

[0020] Figure 3 is the cross-sectional view of the socket of the present utility model;

[0021] Figure 4 is the cross-sectional view of the internal thread disc of the present utility model.

[0022] In the figure: 1, cylinder block; 2, piston rod; 3, piston head; 4, first stepped groove; 5, first external thread; 6, second stepped groove; 7, second external thread; 8, annular groove; 9, internal thread disc; 10, socket; 11, fixing nut; 12, positioning rod; 13, insertion hole. Detailed Description of the Preferred Embodiment

[0023] To make the technical solutions of the present utility model clearer and more definite for those skilled in the art, the present utility model will be further described in detail below in conjunction with the embodiments and the accompanying drawings. However, the embodiments of the present utility model are not limited thereto.

[0024] As Figures 1 - 4 shown, this embodiment provides a repaired fixed piston for a hydraulic support push jack, including a cylinder block 1, a piston rod 2 disposed inside the cylinder block 1 along the length direction, and a piston head 3 installed at the end of the piston rod 2. A first stepped groove 4 is provided at the end of the piston rod 2. A first external thread 5 is provided at the outer side of the first stepped groove 4 away from the inner end of the cylinder block 1. A second stepped groove 6 is provided at the outer side of the first stepped groove 4 close to the inner end of the cylinder block 1. A second external thread 7 is provided at the outer side of the second stepped groove 6 away from the inner end of the cylinder block 1. An internal thread disc 9 is threadedly installed at the outer side of the first external thread 5. A piston head 3 is sleeved and installed at the outer side of the first stepped groove 4. Annular grooves 8 are provided at both ends of the piston head 3. The internal thread disc 9 is stuck inside the annular groove 8 at the end of the piston head 3. A socket 10 is sleeved at the outer side of the first stepped groove 4, and the outer side surface of the socket 10 is attached to the inner side of the piston head 3. The end of the socket 10 is stuck inside the annular groove 8 at the end of the piston head 3 away from the internal thread disc 9. A fixing nut 11 that presses the socket 10 is threadedly installed at the outer side of the second external thread 7.

[0025] Overall working principle: At the front end of the piston rod 2, a first stepped groove 4 and a second stepped groove 6 are machined by a machine tool, and a first external thread 5 is machined on the surface of the first stepped groove 4, and a second external thread 7 is machined on the surface of the second stepped groove 6. In addition, annular grooves 8 are respectively opened at both ends of the piston head 3. During installation, first, the internal thread disc 9 is threadedly installed at the first external thread 5, then the piston head 3 is sleeved on the piston rod 2, and the annular groove 8 fits with the internal thread disc 9. Then, the socket 10 is inserted outside the piston rod 2 and fits with the inner side of the piston head 3. At the same time, the end of the socket 10 is limited inside the annular groove 8. Finally, the fixing nut 11 is installed in cooperation with the second external thread 7 to squeeze and fix the piston head 3.

[0026] In this embodiment, the inner side edge of the fixing nut 11 fits on the end faces of the piston head 3 and the socket 10, and covers the annular groove 8.

[0027] Partial working principle: The fixing nut 11 can not only squeeze and fix the piston head 3, but also fit on the outer surface of the piston head 3, increasing the contact area with the piston head 3 and improving the sealing effect.

[0028] In this embodiment, the outer end face of the internal thread disc 9 and the outer end face of the socket 10 are respectively flush with both ends of the piston head 3.

[0029] Partial working principle: The end parts of the internal thread disc 9 and the socket 10 are respectively hidden inside the piston head 3 and do not change the stroke of the piston head 3.

[0030] In this embodiment, a limiting groove is circumferentially opened on the inner side of the socket 10, and a sealing ring is provided inside the limiting groove.

[0031] Partial working principle: Through the setting of the sealing ring, the sealing effect between the socket 10 and the piston rod 2 can be improved.

[0032] In this embodiment, the inner end face of the socket 10 fits with the surface of the internal thread disc 9, and both the end face of the socket 10 and the side edge of the internal thread disc 9 are smooth planes.

[0033] Partial working principle: The inside of the piston head 3 is completely filled, increasing the contact area between each other and having higher sealing performance.

[0034] In this embodiment, insertion holes 13 are oppositely opened on the fitting surface inside the annular groove 8 of the internal thread disc 9, and a positioning insertion rod 12 is inserted between the insertion holes 13.

[0035] Partial working principle: By using the positioning insertion rod 12, the rotation of the piston head 3 can be avoided, ensuring the stability of the piston head 3.

[0036] In this embodiment, the jacks 13 are distributed in an annular array on the outer side of the internal thread disc 9, and the included angle between adjacent jacks 13 is ninety degrees.

[0037] Local working principle: Through the mutual cooperation of multiple groups of jacks 13 and the positioning insertion rods 12, the positioning stability of the piston head 3 is higher.

[0038] The above is only a further embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the scope disclosed by the present utility model, according to the technical solution and its concept of the present utility model, makes equivalent substitutions or changes, all belong to the protection scope of the present utility model.

Claims

1. A repairable fixed piston for a hydraulic support push jack, comprising a cylinder body (1), a piston rod (2) located inside the cylinder body (1) and arranged along the length direction, and a piston head (3) installed at the end of the piston rod (2), characterized in that: A first stepped groove (4) is provided at the end of the piston rod (2); a first external thread (5) is provided at the outer side of the first stepped groove (4) away from the inner end of the cylinder body (1); a second stepped groove (6) is provided at the outer side of the first stepped groove (4) close to the inner end of the cylinder body (1); a second external thread (7) is provided at the outer side of the second stepped groove (6) away from the inner end of the cylinder body (1); an internal thread disk (9) is installed on the outer side of the first external thread (5); a piston head (3) is installed on the outer side of the first stepped groove (4); and the piston head Both ends of the piston head (3) are provided with annular grooves (8), the internal thread disk (9) is clamped in the internal annular groove (8) at the end of the piston head (3), the outer side of the first stepped groove (4) is sleeved with a plug sleeve (10), and the outer side surface of the plug sleeve (10) is in contact with the inner side of the piston head (3), the end of the plug sleeve (10) is clamped in the internal annular groove (8) at one end of the piston head (3) away from the internal thread disk (9), and the outer side thread of the second external thread (7) is installed with a fixing nut (11) for pressing the plug sleeve (10).

2. The repairable fixed piston of the hydraulic support push jack according to claim 1 is characterized in that: The inner side of the fixing nut (11) is fitted on the piston head (3) and the end surface of the insert sleeve (10), and covers the annular groove (8).

3. The repairable fixed piston of the hydraulic support push jack according to claim 2 is characterized in that: The outer end surface of the internal threaded disc (9) and the outer end surface of the insert sleeve (10) are respectively flush with the two ends of the piston head (3).

4. The repairable fixed piston of the hydraulic support push jack according to claim 1 is characterized in that: A limiting groove is provided on the inner side of the insert sleeve (10) along the circumferential direction, and a sealing ring is provided inside the limiting groove.

5. The repairable fixed piston of the hydraulic support push jack according to claim 4 is characterized in that: The inner end surface of the insert sleeve (10) is in contact with the surface of the internal threaded disc (9), and the end surface of the insert sleeve (10) and the side edge of the internal threaded disc (9) are both smooth planes.

6. The repairable fixed piston of the hydraulic support push jack according to any one of claims 1 to 5, characterized in that: Insertion holes (13) are provided on the mating surfaces of the internal threaded disc (9) and the inner part of the annular groove (8) respectively, and a positioning insertion rod (12) is inserted between the insertion holes (13).

7. The repairable fixed piston of the hydraulic support push jack according to claim 6 is characterized by: The insertion holes (13) are distributed in an annular array on the outer side of the internal threaded disk (9), and the angle between adjacent insertion holes (13) is ninety degrees.

Images