Hydraulic support jack

Abstract

The invention relates to the technical field of mining mechanical equipment, and particularly discloses a hydraulic support jack which comprises a cylinder barrel, a piston rod, a piston assembly and a cylinder cover assembly, the piston assembly is fixedly connected with the piston rod through a connecting bolt, and an inner hexagonal elastic pipe and an elastic washer are arranged to improve the sealing performance and stability; the cylinder cover assembly is composed of a guide sleeve, multi-layer sealing and dustproof design is achieved, the working performance of the jack is effectively improved, and the service life of the jack is effectively prolonged. The technical effect of enhancing the reliability and durability of the jack is achieved.

Description

Technical Field

[0001] The present application relates to the technical field of mining machinery and equipment, and in particular to a hydraulic support jack. Background Art

[0002] Hydraulic support jack is one of the commonly used support equipment in mining, mainly used to support and adjust the top and side of the mine tunnel. With the continuous development of the mining industry, the requirements for hydraulic supports are also increasing, especially for their reliability and service life. Although the traditional hydraulic support jack meets the use requirements to a certain extent, there are still some shortcomings in practical applications.

[0003] At present, common hydraulic support jacks mainly include components such as a cylinder body, a piston shaft, a piston and a cylinder head. During assembly, the piston shaft and the piston are connected by bolts, and the cylinder head and the cylinder body are connected by bolts.

[0004] The above-mentioned related technologies have the following defects: after long-term use, the bolt connection parts of the existing hydraulic support jacks are prone to loosening due to frequent pressure changes and mechanical wear, which in turn leads to loosening between the piston shaft and the piston, and between the cylinder head and the cylinder body, thereby affecting the overall stability and reliability of the jack. Especially in high-pressure environments, this loosening phenomenon is more obvious, which not only reduces work efficiency but may also cause safety accidents. Summary of the invention

[0005] In order to improve the overall stability of the jack, the present application provides a hydraulic support jack.

[0006] The hydraulic support jack provided in this application adopts the following technical solution: A hydraulic support jack, comprising a cylinder, a piston rod, a piston assembly and a cylinder head assembly, wherein the piston rod, the piston assembly and the cylinder head assembly are all coaxially arranged in the cylinder, the piston assembly and the cylinder head assembly are both sleeved on the piston rod, and the piston assembly is installed at one end of the piston rod facing the inner bottom of the cylinder, and the cylinder head assembly is installed on the barrel mouth of the cylinder; the piston assembly comprises a piston head and a plurality of connecting bolts, the piston head is coaxially sleeved on the piston rod, the outer side wall of the piston head is provided with a plurality of radially arranged blind holes, and the hole wall of the blind hole is provided with a coaxial An annular groove, a coaxial through hole is provided at the bottom of the blind hole; a plurality of screw holes corresponding to the plurality of through holes are provided on the piston rod; a coaxial hexagonal elastic tube is provided in each of the annular grooves, and the outer side wall of the hexagonal elastic tube is connected to the piston head; a plurality of connecting bolts are arranged corresponding to the plurality of through holes, and the screw rods of the connecting bolts pass through the corresponding through holes and are screwed into the corresponding screw holes; the head of the connecting bolt is hexagonal, and a hexagonal blind hole is provided at the end of the head away from the screw rod, and the outer diameter of the head is equal to the inner diameter of the hexagonal elastic tube.

[0007] By adopting the above technical solution, when installing the bolt, the hexagonal wrench can be inserted into the hexagonal blind hole, and the connecting bolt can be screwed into the screw hole by rotating the hexagonal wrench. In the process of rotating the connecting bolt, since the hexagonal elastic tube itself has good elasticity and can be compressed, even if the outer diameter of the head is equal to the inner diameter of the hexagonal elastic tube, after the torque applied to the head by the hexagonal wrench increases to a certain extent, the head can press the hexagonal elastic tube into deformation and forcibly rotate until the connecting bolt is fully screwed. When setting the position of the hexagonal elastic tube, it is necessary to ensure that after the connecting bolt is installed in place, the six corners of the head can be inserted into the six corners of the hexagonal elastic tube respectively, so as to realize the limit of the hexagonal elastic tube to the head. In this application, the cooperation between the hexagonal elastic tube and the connecting bolt set on the piston head not only enhances the stability of the structure, but also effectively prevents the loosening phenomenon caused by vibration. In addition, this design makes the disassembly and assembly process more convenient and improves the maintenance efficiency.

[0008] Preferably, an elastic gasket is provided between the head and the bottom of the blind hole.

[0009] By adopting the above technical solution, the elastic gasket between the head of the connecting bolt and the bottom of the blind hole can effectively prevent loosening caused by vibration, thereby ensuring the stability and reliability of the piston assembly during long-term use.

[0010] Preferably, the plurality of blind holes are distributed along the circumference of the piston head; a coaxial first guide ring is installed on the outer side wall of the piston head; and the blind holes are arranged on the inner side of the first guide ring.

[0011] By adopting the above technical solution, multiple blind holes are distributed along the circumference of the piston head, so that the connecting bolts can be evenly distributed on the piston head, ensuring the stability and force balance of the piston assembly. At the same time, the installation position of the first guide ring is reasonably designed, which not only improves the coaxiality and linear motion accuracy between the piston head and the cylinder, but also effectively prevents the piston head from deflecting or getting stuck during movement. In addition, the first guide ring also blocks the orifice of the blind hole to prevent the hydraulic oil in the cylinder from entering the blind hole.

[0012] Preferably, a coaxial first outer sealing ring is installed on the outer side wall of the piston head.

[0013] By adopting the above technical solution, the installation of the first outer sealing ring effectively improves the sealing performance between the piston head and the cylinder barrel, prevents hydraulic oil leakage, and ensures the stability and reliability of the hydraulic system.

[0014] Preferably, a coaxial first inner sealing ring is connected between the piston head and the piston rod.

[0015] By adopting the above technical solution, the first inner sealing ring between the piston head and the piston rod can effectively prevent hydraulic oil leakage, improve the sealing performance and working reliability of the jack. At the same time, the sealing design helps to extend the service life of the jack and reduce the maintenance frequency.

[0016] Preferably, the cylinder head assembly includes a guide sleeve, which includes a round tube, a first externally threaded tube and a limiting ring, and the round tube, the first externally threaded tube and the limiting ring are coaxially connected in sequence; the first externally threaded tube is threadedly connected to the cylinder barrel, and the limiting ring is bolted to the barrel mouth of the cylinder barrel.

[0017] By adopting the above technical solution, the stability and sealing of the hydraulic support jack can be effectively improved. Specifically: the design of the guide sleeve makes the piston rod more stable during movement, reducing the risk of deviation and wear. The screw connection structure between the first external threaded tube and the cylinder ensures a tight connection between the guide sleeve and the cylinder, improving the overall stability of the device. The bolt connection between the limit ring and the barrel mouth of the cylinder further enhances the fixing effect of the guide sleeve, prevents loosening or falling off, and thus ensures reliable performance in long-term use.

[0018] Preferably, a coaxial second outer sealing ring is installed on the outer wall of the circular tube; and a coaxial third outer sealing ring is provided between the limiting ring and the cylinder barrel.

[0019] By adopting the above technical solution, the setting of the second outer sealing ring and the third outer sealing ring effectively improves the sealing performance between the round tube and the cylinder, prevents liquid leakage, and at the same time enhances the connection stability between the limit ring and the cylinder, ensuring the reliability and safety of the hydraulic support jack in a high-pressure working environment.

[0020] Preferably, a coaxial dust ring, a plurality of second guide rings and a plurality of second inner sealing rings are installed on the inner hole wall of the guide sleeve, and the dust ring is located on the side of the second guide ring and the second inner sealing ring away from the piston assembly.

[0021] By adopting the above technical solution, the dust ring can effectively prevent external dust and impurities from entering the guide sleeve, thereby improving the service life and working reliability of the jack; multiple second guide rings can ensure that the piston rod maintains good straightness during reciprocating motion, reduce wear, and improve operating stability; multiple second inner sealing rings further enhance the sealing performance between the guide sleeve and the piston rod, prevent oil leakage, and ensure the normal operation of the hydraulic system.

[0022] Preferably, the hydraulic support jack further comprises a support pipe assembly, the support pipe assembly comprises a guide pipe and a reinforcement pipe, and the guide pipe is coaxially sleeved on one end of the cylinder barrel; The reinforcement tube is coaxially sleeved on the other end of the cylinder and can be interference fit with the cylinder, and the reinforcement tube is coaxially connected with the guide tube.

[0023] By adopting the above technical solution, the guide tube is sleeved on the cylinder to guide the reinforcement tube, and the reinforcement tube and the cylinder have an interference fit, so that the reinforcement tube can fit tightly with the cylinder, which can effectively and stably increase the wall thickness of the cylinder, thereby increasing the pressure-bearing capacity of the jack, so that it can withstand higher working pressure.

[0024] Preferably, the side wall of the guide tube is provided with a coaxial first external thread; The reinforcement tube includes a plurality of arched side plates, which surround the reinforcement tube, one end of the arched side plate is connected to the guide tube, and the other end is provided with a limit plate, and a second external thread is provided on a side of the arched side plate away from the cylinder, and the second external thread has the same specification as the first external thread; The support tube assembly further includes an internally threaded tube, and the internally threaded tube can be threadedly connected with the first external thread and the second external thread.

[0025] By adopting the above technical solution, after the guide tube and the reinforcement tube are both sleeved on the cylinder, the internal threaded tube is screwed with the first external thread and the second external thread in sequence, and the arched side plate is pressed against the side wall of the cylinder, so that the reinforcement tube surrounded by multiple arched side plates has an interference fit with the side wall of the cylinder, and the arched side plate can be tightly pressed against the side wall of the cylinder, thereby effectively reinforcing the side wall of the cylinder.

[0026] In summary, the present application includes at least one of the following beneficial technical effects: 1. In the present application, the piston assembly is fixed to the piston rod by a plurality of connecting bolts, and the head of each connecting bolt is provided with a hexagonal blind hole and embedded in the hexagonal elastic tube, so that the connection is more stable, effectively avoiding the loosening of the bolt due to pressure changes and mechanical wear, and improving the overall stability and reliability of the jack.

[0027] 2. The elastic washer provided between the head of the connecting bolt and the bottom of the blind hole in the present application can absorb vibration and impact, reduce stress concentration, and extend the service life of the piston assembly.

[0028] 3. In the present application, the coordinated cooperation of the guide tube and the reinforcement tube can increase the wall thickness of the cylinder, thereby increasing the pressure-bearing capacity of the jack, so that it can withstand higher working pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0030] Figure 1 is a partial structural cross-sectional schematic diagram of embodiment 1; Figure 2 yes Figure 1 A magnified schematic diagram of part A; Figure 3 yes Figure 1 A magnified schematic diagram of part B; Figure 4 is an exploded schematic diagram of a cylinder head assembly of Embodiment 2; Figure 5 It is a schematic diagram of the guide sleeve structure of the second embodiment.

[0031] Reference numerals: 1. Cylinder barrel; 101. Internal thread; 2. Piston rod; 201. Screw hole; 3. Piston assembly; 30. Piston head; 301. Blind hole; 302. Annular groove; 303. Through hole; 31. First guide ring; 32. First outer sealing ring; 33. First inner sealing ring; 34. Hexagonal elastic tube; 35. Connecting bolt; 351. Head; 352. Screw rod; 36. Elastic gasket; 4. Cylinder head assembly; 41. Guide sleeve; 411. Round tube; 412. First external threaded tube; 413. Limiting ring; 5. Support tube assembly; 51. Guide tube; 510. First external thread; 52. Reinforcement tube; 521. Arched side plate; 520. Second external thread; 522. Limiting plate; 53. Internal threaded tube. DETAILED DESCRIPTION

[0032] The following is combined with Figure 1-5 This application is described in further detail.

[0033] The embodiment of the present application discloses a hydraulic support jack. Example

[0034] Reference Figure 1 , Figure 2 and Figure 3 A hydraulic support jack includes a cylinder 1, a piston rod 2, a piston assembly 3 and a cylinder head assembly 4. The piston rod 2, the piston assembly 3 and the cylinder head assembly 4 are all coaxially arranged in the cylinder 1. The piston assembly 3 and the cylinder head assembly 4 are both sleeved on the piston rod 2, and the piston assembly 3 is installed at one end of the piston rod 2 facing the inner bottom of the cylinder 1, and the cylinder head assembly 4 is installed at the barrel mouth of the cylinder 1. The piston assembly 3 includes a piston head 30 and a plurality of connecting bolts 35. The piston head 30 is coaxially sleeved on the piston rod 2. The outer wall of the piston head 30 is provided with a plurality of blind holes 301 arranged radially. The plurality of blind holes 301 are distributed along the circumference of the piston head 30, so that the connecting bolts 35 can be evenly distributed on the piston head 30, ensuring the stability and force balance of the piston assembly 3. The outer wall of the piston head 30 is installed with a coaxial first guide ring 31. The first guide ring 31 not only improves the coaxiality and linear motion accuracy between the piston head 30 and the cylinder 1, but also effectively prevents the piston head 30 from deflecting or getting stuck during the movement. The first guide ring 31 also blocks the orifice of the blind hole 301 to prevent the hydraulic oil in the cylinder 1 from entering the blind hole 301. The blind hole 301 is arranged on the inner side of the first guide ring 31. The hole wall of the blind hole 301 is provided with a coaxial annular groove 302, and the bottom of the blind hole 301 is provided with a coaxial through hole 303. The piston rod 2 is provided with a plurality of screw holes 201 corresponding to the plurality of through holes 303. A coaxial hexagonal elastic tube 34 is provided in each annular groove 302, and the outer side wall of the hexagonal elastic tube 34 is connected to the piston head 30. A plurality of connecting bolts 35 are provided corresponding to the plurality of through holes 303, and the screw rod 352 of the connecting bolt 35 passes through the corresponding through hole 303 and is screwed into the corresponding screw hole 201. The head 351 of the connecting bolt 35 is hexagonal, and a hexagonal blind hole 301 is provided at one end of the head 351 away from the screw rod 352, and the outer diameter of the head 351 is equal to the inner diameter of the hexagonal elastic tube 34. An elastic washer 36 is provided between the head 351 and the bottom of the blind hole 301.

[0035] Reference Figure 1 , Figure 2 and Figure 3By adopting the above technical solution, when installing the bolt, the hexagonal wrench can be inserted into the hexagonal blind hole 301, and the connecting bolt 35 can be screwed into the screw hole 201 by rotating the hexagonal wrench. In the process of rotating the connecting bolt 35, since the hexagonal elastic tube 34 itself has good elasticity and can be compressed, even if the outer diameter of the head 351 is equal to the inner diameter of the hexagonal elastic tube 34, after the torque applied to the head 351 by the hexagonal wrench increases to a certain extent, the head 351 can compress the hexagonal elastic tube 34 and forcibly rotate until the connecting bolt 35 is fully in the screw hole 201. When setting the position of the hexagonal elastic tube 34, it is necessary to ensure that after the connecting bolt 35 is installed in place, the six corners of the head 351 can be just inserted into the six corners of the hexagonal elastic tube respectively, so as to achieve the limit of the hexagonal elastic tube on the head 351. The elastic washer 36 between the head 351 of the connecting bolt 35 and the bottom of the blind hole 301 can effectively prevent loosening caused by vibration, thereby ensuring the stability and reliability of the piston assembly 3 during long-term use.

[0036] Reference Figure 1 , Figure 2 and Figure 3 The outer side wall of the piston head 30 is provided with a coaxial first outer sealing ring 32. By adopting the above technical solution, the installation of the first outer sealing ring 32 effectively improves the sealing performance between the piston head 30 and the cylinder barrel 1, prevents hydraulic oil leakage, and ensures the stability and reliability of the hydraulic system.

[0037] Reference Figure 1 , Figure 2 and Figure 3 A coaxial first inner seal ring 33 is connected between the piston head 30 and the piston rod 2. By adopting the above technical solution, the first inner seal ring 33 between the piston head 30 and the piston rod 2 can effectively prevent hydraulic oil leakage, improve the sealing performance and working reliability of the jack. At the same time, the sealing design helps to extend the service life of the jack and reduce the maintenance frequency.

[0038] Reference Figure 1 , Figure 2 and Figure 3The cylinder head assembly 4 includes a guide sleeve 41, which includes a round tube 411, a first externally threaded tube 412 and a stop ring 413. The round tube 411, the first externally threaded tube 412 and the stop ring 413 are coaxially connected in sequence. An internal thread 101 is provided at the mouth of the cylinder barrel 1, the first externally threaded tube 412 is screwed to the cylinder barrel 1 through the internal thread 101, and the stop ring 413 is bolted to the mouth of the cylinder barrel 1. By adopting the above technical solution, the stability and sealing of the hydraulic support jack can be effectively improved. Specifically: the design of the guide sleeve 41 makes the piston rod 2 more stable during movement, reducing the risk of deviation and wear. The screw connection structure of the first externally threaded tube 412 and the cylinder barrel 1 ensures the tight connection between the guide sleeve 41 and the cylinder barrel 1, and improves the overall stability of the device. The stop ring 413 is bolted to the mouth of the cylinder barrel 1 to further enhance the fixing effect of the guide sleeve 41, prevent loosening or falling off, thereby ensuring reliable performance in long-term use.

[0039] Reference Figure 1 , Figure 2 and Figure 3 , a coaxial second outer sealing ring 42 is installed on the outer wall of the circular tube 411. A coaxial third outer sealing ring 43 is provided between the limiting ring 413 and the cylinder 1. By adopting the above technical solution, the second outer sealing ring 42 and the third outer sealing ring 43 are effectively provided to improve the sealing performance between the circular tube 411 and the cylinder 1, prevent liquid leakage, and enhance the connection stability between the limiting ring 413 and the cylinder 1, thereby ensuring the reliability and safety of the hydraulic support jack under high-pressure working environment.

[0040] Reference Figure 1 , Figure 2 and Figure 3 The inner hole wall of the guide sleeve 41 is installed with a coaxial dust ring 46, a plurality of second guide rings 44 and a plurality of second inner sealing rings 45. The dust ring 46 is located on the side of the second guide ring 44 and the second inner sealing ring 45 away from the piston assembly 3. By adopting the above technical solution, the dust ring 46 can effectively prevent external dust and impurities from entering the guide sleeve 41, thereby improving the service life and working reliability of the jack. The plurality of second guide rings 44 can ensure that the piston rod 2 maintains good straightness during the reciprocating motion, reduce wear and improve operational stability. The plurality of second inner sealing rings 45 further enhance the sealing performance between the guide sleeve 41 and the piston rod 2, prevent oil leakage, and ensure the normal operation of the hydraulic system.

[0041] The implementation principle of a hydraulic support jack in the embodiment of the present application is: First, install the cylinder head assembly 4 on the piston rod 2 : after installing the second guide ring 44 , the second inner sealing ring 45 and the dust ring 46 on the inner wall of the guide sleeve 41 , put the guide sleeve 41 on the piston rod 2 .

[0042] Then install the piston assembly 3 on the piston rod 2: when installing the piston assembly 3, first install the first inner sealing ring 33 on the piston rod 2, then install the elastic washer 36 at the bottom of the blind hole 301, and then install the hexagon socket elastic tube 34 in the annular groove 302. Then, after the piston head 30 is sleeved on the piston rod 2, insert the hexagon socket blind hole 301 into the hexagon socket, and screw the connecting bolt 35 into the screw hole 201 by rotating the hexagon socket wrench. In the process of rotating the connecting bolt 35, since the hexagon socket elastic tube 34 has good elasticity and can be compressed, even if the outer diameter of the head 351 is equal to the inner diameter of the hexagon socket elastic tube 34, after the torque applied to the head 351 by the hexagon socket wrench increases to a certain extent, the head 351 can compress the hexagon socket elastic tube 34 and forcibly rotate until the connecting bolt 35 is fully in the screw hole 201. When setting the position of the hexagonal elastic tube 34, it is necessary to ensure that after the connecting bolt 35 is installed in place, the six corners of the head 351 can be inserted into the six corners of the hexagonal elastic tube respectively, so that the hexagonal elastic tube can limit the head 351. The elastic gasket 36 between the head 351 of the connecting bolt 35 and the bottom of the blind hole 301 can effectively prevent loosening caused by vibration, ensuring the stability and reliability of the piston assembly 3 during long-term use. Finally, the first guide ring 31 and the first outer sealing ring 32 are installed on the piston head 30.

[0043] Finally, the piston assembly 3 is inserted into the cylinder barrel 1 , the first externally threaded tube 412 is screwed to the cylinder barrel 1 , and the limiting ring 413 is bolted to the barrel mouth of the cylinder barrel 1 , so as to realize the connection between the cylinder head assembly 4 and the cylinder barrel 1 . Example

[0044] Reference Figure 4 and Figure 5 The difference between the second embodiment and the first embodiment is that the hydraulic support jack further includes a support pipe assembly 5, and the support pipe assembly 5 includes a guide pipe 51 and a reinforcement pipe 52, and the guide pipe 51 is coaxially sleeved on one end of the cylinder 1. The reinforcement pipe 52 is coaxially sleeved on the other end of the cylinder 1, and can be interference-fitted with the cylinder 1, and the reinforcement pipe 52 is coaxially connected with the guide pipe 51. By sleeved the guide pipe 51 on the cylinder 1, the reinforcement pipe 52 is sleeved on the cylinder 1 for guidance, and the reinforcement pipe 52 is interference-fitted with the cylinder 1, so that the reinforcement pipe 52 can be closely fitted with the cylinder 1, and the wall thickness of the cylinder 1 can be effectively and stably increased, thereby increasing the pressure bearing capacity of the jack, so that it can withstand higher working pressure.

[0045] Reference Figure 4 and Figure 5, the side wall of the guide tube 51 is provided with a coaxial first external thread 510. The reinforcement tube 52 includes a plurality of arched side plates 521, and the plurality of arched side plates 521 surround the reinforcement tube 52, one end of the arched side plate 521 is connected to the guide tube 51, and the other end is provided with a stop plate 522, and the side of the arched side plate 521 away from the cylinder 1 is provided with a second external thread 520, and the second external thread 520 has the same specifications as the first external thread 510. The support tube assembly 5 also includes an internal threaded tube 53, and the internal threaded tube 53 can be screwed with the first external thread 510 and the second external thread 520. After the guide tube 51 and the reinforcement tube 52 are both sleeved on the cylinder 1, the internal threaded tube 53 is screwed with the first external thread 510 and the second external thread 520 in sequence, and the arched side plate 521 is pressed against the side wall of the cylinder 1, so that the reinforcement tube 52 surrounded by multiple arched side plates 521 has an interference fit with the side wall of the cylinder 1, and then the arched side plate 521 can be tightly pressed against the side wall of the cylinder 1, thereby effectively reinforcing the side wall of the cylinder 1.

[0046] The implementation principle of a hydraulic support jack in the embodiment of the present application is: First, install the cylinder head assembly 4 on the piston rod 2 : after installing the second guide ring, the second inner sealing ring and the dust ring on the inner wall of the guide sleeve 41 , put the guide sleeve 41 on the piston rod 2 .

[0047] Then install the piston assembly 3 on the piston rod 2: when installing the piston assembly 3, first install the first inner sealing ring 33 on the piston rod 2, then install the elastic washer 36 at the bottom of the blind hole 301, and then install the hexagon socket elastic tube 34 in the annular groove 302. Then, after the piston head 30 is sleeved on the piston rod 2, insert the hexagon socket blind hole 301 into the hexagon socket, and screw the connecting bolt 35 into the screw hole 201 by rotating the hexagon socket wrench. In the process of rotating the connecting bolt 35, since the hexagon socket elastic tube 34 has good elasticity and can be compressed, even if the outer diameter of the head 351 is equal to the inner diameter of the hexagon socket elastic tube 34, after the torque applied to the head 351 by the hexagon socket wrench increases to a certain extent, the head 351 can compress the hexagon socket elastic tube 34 and forcibly rotate until the connecting bolt 35 is fully in the screw hole 201. When setting the position of the hexagonal elastic tube 34, it is necessary to ensure that after the connecting bolt 35 is installed in place, the six corners of the head 351 can be inserted into the six corners of the hexagonal elastic tube respectively, so that the hexagonal elastic tube can limit the head 351. The elastic gasket 36 between the head 351 of the connecting bolt 35 and the bottom of the blind hole 301 can effectively prevent loosening caused by vibration, ensuring the stability and reliability of the piston assembly 3 during long-term use. Finally, the first guide ring 31 and the first outer sealing ring 32 are installed on the piston head 30.

[0048] Finally, the piston assembly 3 is inserted into the cylinder barrel 1. The first externally threaded tube 412 is screwed to the cylinder barrel 1, and the limiting ring 413 is bolted to the barrel mouth of the cylinder barrel 1 to achieve the connection between the cylinder head assembly 4 and the cylinder barrel 1.

[0049] When it is necessary to reinforce the cylinder 1, after the guide tube 51 and the reinforcement tube 52 are both put on the cylinder 1, the internal threaded tube 53 is screwed with the first external thread 510 and the second external thread 520 in sequence, and the arched side plate 521 is pressed against the side wall of the cylinder 1, so that the reinforcement tube 52 surrounded by multiple arched side plates 521 has an interference fit with the side wall of the cylinder 1, and then the arched side plate 521 can be tightly pressed against the side wall of the cylinder 1, thereby effectively reinforcing the side wall of the cylinder 1.

[0050] Unless otherwise defined, the technical terms or scientific terms used in this application should be understood by people with ordinary skills in the field to which this application belongs. The words "first", "second", "third" and similar words used in the specification and claims of this application do not indicate any order, quantity or importance, but are only used to distinguish different components. "One" or "one" and similar words do not indicate a quantitative limit, but indicate that there is at least one. "Include" or "comprise" and similar words mean that the elements or objects appearing before "include" or "comprise" include the elements or objects listed after "include" or "comprise" and their equivalents, and do not exclude other elements or objects. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0051] The above are all optional embodiments of the present application, and are not intended to limit the protection scope of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A hydraulic support jack, characterized in that: The invention comprises a cylinder barrel (1), a piston rod (2), a piston assembly (3) and a cylinder head assembly (4), wherein the piston rod (2), the piston assembly (3) and the cylinder head assembly (4) are all coaxially arranged in the cylinder barrel (1), the piston assembly (3) and the cylinder head assembly (4) are both sleeved on the piston rod (2), and the piston assembly (3) is mounted on an end of the piston rod (2) facing the inner bottom of the cylinder barrel (1), and the cylinder head assembly (4) is mounted on the barrel mouth of the cylinder barrel (1); The piston assembly (3) comprises a piston head (30) and a plurality of connecting bolts (35); the piston head (30) is coaxially sleeved on the piston rod (2); the outer wall of the piston head (30) is provided with a plurality of radially arranged blind holes (301); the hole wall of the blind hole (301) is provided with a coaxial annular groove (302); the bottom of the blind hole (301) is provided with a coaxial through hole (303); the piston rod (2) is provided with a plurality of screw holes (201) corresponding one-to-one to the plurality of through holes (303); A coaxial hexagonal elastic tube (34) is disposed in each of the annular grooves (302), and an outer side wall of the hexagonal elastic tube (34) is connected to the piston head (30); The plurality of connecting bolts (35) are arranged corresponding to the plurality of through holes (303); the screw rod (352) of the connecting bolt (35) passes through the corresponding through hole (303) and is screwed into the corresponding screw hole (201); the head (351) of the connecting bolt (35) is hexagonal, and an inner hexagonal blind hole (301) is provided at one end of the head (351) away from the screw rod (352); and the outer diameter of the head (351) is equal to the inner diameter of the inner hexagonal elastic tube (34).

2. A hydraulic support jack according to claim 1, characterized in that: An elastic gasket (36) is provided between the head (351) and the bottom of the blind hole (301).

3. The hydraulic support jack according to claim 1, characterized in that: The plurality of blind holes (301) are distributed along the circumference of the piston head (30); a coaxial first guide ring (31) is installed on the outer side wall of the piston head (30); and the blind holes (301) are arranged on the inner side of the first guide ring (31).

4. The hydraulic support jack according to claim 1, characterized in that: A coaxial first outer sealing ring (32) is mounted on the outer side wall of the piston head (30).

5. The hydraulic support jack according to claim 1, characterized in that: A coaxial first inner sealing ring (33) is connected between the piston head (30) and the piston rod (2).

6. The hydraulic support jack according to claim 1, characterized in that: The cylinder head assembly (4) comprises a guide sleeve (41), the guide sleeve (41) comprises a round tube (411), a first externally threaded tube (412) and a limiting ring (413), the round tube (411), the first externally threaded tube (412) and the limiting ring (413) being coaxially connected in sequence; The first externally threaded tube (412) is threadedly connected to the cylinder barrel (1), and the limiting ring (413) is bolted to the barrel mouth of the cylinder barrel (1).

7. The hydraulic support jack according to claim 6, characterized in that: A coaxial second outer sealing ring (42) is installed on the outer wall of the circular tube (411); and a coaxial third outer sealing ring (43) is provided between the limiting ring (413) and the cylinder barrel (1).

8. The hydraulic support jack according to claim 6, characterized in that: A coaxial dust ring (46), a plurality of second guide rings (44) and a plurality of second inner sealing rings (45) are mounted on the inner hole wall of the guide sleeve (41); the dust ring (46) is located on a side of the second guide ring (44) and the second inner sealing ring (45) away from the piston assembly (3).

9. The hydraulic support jack according to claim 1, characterized in that: The hydraulic support jack further comprises a support pipe assembly (5), wherein the support pipe assembly (5) comprises a guide pipe (51) and a reinforcement pipe (52), wherein the guide pipe (51) is coaxially sleeved on one end of the cylinder barrel (1); The reinforcement tube (52) is coaxially sleeved on the other end of the cylinder barrel (1) and is capable of interference fit with the cylinder barrel (1), and the reinforcement tube (52) is coaxially connected to the guide tube (51).

10. The hydraulic support jack according to claim 9, characterized in that: The side wall of the guide tube (51) is provided with a coaxial first external thread (510); The reinforcement tube (52) comprises a plurality of arched side plates (521), the plurality of arched side plates (521) enclosing the reinforcement tube (52), one end of the arched side plate (521) being connected to the guide tube (51), and the other end being provided with a limit plate (522), and a second external thread (520) being provided on a surface of the arched side plate (521) away from the cylinder barrel (1), and the second external thread (520) having the same specification as the first external thread (510); The support tube assembly (5) further comprises an internally threaded tube (53), wherein the internally threaded tube (53) can be threadedly connected to the first external thread (510) and the second external thread (520).

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