Explosion-proof hydraulic power tongs

Abstract

The utility model relates to the technical field of hydraulic power tongs, in particular to explosion-proof hydraulic power tongs which comprise a hydraulic cylinder body, the hydraulic cylinder body is installed on a machine shell of the explosion-proof hydraulic power tongs through a fixing ring, a cylinder cover is installed at the top end of the hydraulic cylinder body in a threaded connection mode, and a plurality of sets of anti-loosening block installation grooves are formed in the inner wall of the cylinder cover. The anti-loosening hydraulic cylinder has the beneficial effects that when threaded connection between the hydraulic cylinder body and the cylinder cover has a loosening trend, the anti-loosening block mounting groove and the inner wall of the anti-loosening groove generate extrusion stress on the anti-loosening block, so that the hydraulic cylinder body and the cylinder cover cannot rotate relatively, and the purpose of preventing the threads between the hydraulic cylinder body and the cylinder cover from loosening is achieved; and the purpose of explosion of the cylinder cover is further achieved, and an explosion-proof measure of the cylinder cover of the hydraulic cylinder is provided for the explosion-proof hydraulic power tongs.

Description

Technical Field

[0001] The utility model relates to the field of hydraulic power tongs, in particular to a flameproof hydraulic power tongs. Background Art

[0002] Flameproof hydraulic power tongs are a specially designed hydraulic tool, mainly used for tightening and disassembling pipe connections in flammable and explosive environments such as petroleum, chemical, and mining. This tool has a flameproof function that can prevent sparks or heat from being transferred to the external environment, thereby reducing the risk of explosion.

[0003] In the prior art, a patent document with an application number of CN201921220490.0, which was reviewed and published by the State Intellectual Property Office of China, discloses a flameproof hydraulic power tongs, including a casing, a hydraulic cylinder and a tongs head, a fixing ring is arranged on the left side of the upper end of the casing, a hydraulic cylinder is arranged on the upper end of the fixing ring, a tongs head is arranged inside the casing, mounting holes are provided at the upper and lower ends of the casing between the tongs head and the tongs head, ventilation frames are arranged on the front and rear sides of the upper end of the casing corresponding to the mounting hole position, fans are arranged inside the ventilation frames, ventilation holes are arranged at the position of the upper end of the casing corresponding to the ventilation frame, ventilation holes are arranged at the position of the lower end of the casing corresponding to the ventilation holes at the upper end of the casing, only mounting grooves are arranged at the four corners of the lower end of the casing, and lifting rods are arranged inside the mounting grooves. The utility model solves the problem that the hydraulic power tongs do not have the flameproof function and the lifting function by arranging the fan, the ventilation holes and the lifting rods.

[0004] However, the cylinder head of the hydraulic cylinder used in the explosion-proof hydraulic power tongs in the prior art is still installed with the hydraulic cylinder body in a single traditional threaded connection manner. During the use of the hydraulic cylinder, the cylinder pressure inside the hydraulic cylinder will undergo a huge change, which will cause the threaded connection between the cylinder head and the hydraulic cylinder body to gradually loosen. When the threaded connection loosens to a certain extent, continuing to use the hydraulic cylinder will cause the cylinder head of the hydraulic cylinder to explode. Therefore, the explosion-proof hydraulic power tongs in the prior art lack explosion-proof measures for the cylinder head of the hydraulic cylinder. Utility Model Content

[0005] The utility model aims to provide a flameproof hydraulic power tongs to solve the problems raised in the above background technology.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions: a flameproof hydraulic power tongs,

[0007] It includes: a hydraulic cylinder body, which is installed on the casing of the explosion-proof hydraulic power tongs through a fixing ring, and a cylinder cover is installed on the top of the hydraulic cylinder body through a threaded connection. A plurality of groups of anti-loosening block installation grooves are opened on the inner wall of the cylinder cover, and one end of the anti-loosening block is movably inserted in the anti-loosening block installation groove, and the other end of the anti-loosening block is movably inserted in the anti-loosening groove, and the anti-loosening groove is opened on the surface of the hydraulic cylinder body.

[0008] Preferably, the anti-loosening grooves are provided in a plurality of groups, the plurality of groups of anti-loosening grooves correspond to the plurality of groups of anti-loosening block mounting grooves one by one, and the plurality of groups of anti-loosening block mounting grooves and the plurality of groups of anti-loosening grooves are distributed in a circle about the hydraulic cylinder body.

[0009] Preferably, the anti-loosening block is in a rectangular block structure, and a connecting rod and an anti-loosening spring are fixed to one end of the anti-loosening block extending into the anti-loosening block installation slot, and the end of the anti-loosening spring away from the anti-loosening block is fixed to the inner wall of the anti-loosening block installation slot.

[0010] Preferably, a plurality of connecting rod holes are provided on the surface of the cylinder head, and the plurality of connecting rod holes are respectively connected with the plurality of anti-loosening block mounting grooves, and one end of the connecting rod away from the anti-loosening block is movably inserted in the connecting rod hole, and the other end of the connecting rod away from the anti-loosening block extends from the top end of the connecting rod hole, and the connecting rod has a circular rod body structure.

[0011] Preferably, the connecting rods are provided in several groups, and one end of the connecting rods in the several groups extending out of the connecting rod holes is fixed with the same group of pull-out rings, and the pull-out rings are in an annular plate-shaped structure.

[0012] Preferably, a sealing groove is provided on the inner wall of the cylinder cover, and the sealing groove is in the form of an annular groove body. A sealing gasket is fixed in the sealing groove, and one end of the sealing gasket protruding from the sealing groove abuts against the surface of the hydraulic cylinder body.

[0013] Preferably, a hydraulic oil through hole is provided on the surface of the hydraulic cylinder body, one end of a hydraulic pipe is connected to the position where the hydraulic oil through hole is provided on the hydraulic cylinder body, and the other end of the hydraulic pipe is connected to an oil storage cylinder.

[0014] Preferably, a piston rod is movably inserted on the surface of the hydraulic cylinder body, one end of the piston rod extends into the hydraulic cylinder body, a piston is fixed to the end of the piston rod extending into the hydraulic cylinder body, a piston spring is sleeved on the rod body of the part of the piston rod extending into the hydraulic cylinder body, one end of the piston spring abuts against the surface of the piston, and the other end of the piston spring abuts against the inner wall of the hydraulic cylinder body.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] The explosion-proof hydraulic power pliers proposed by the utility model tighten the cylinder cover on the hydraulic cylinder body through threaded connection, and after tightening, the relative position of the hydraulic cylinder body and the cylinder cover is fine-tuned to align the mounting grooves of each group of anti-loosening blocks with the mounting grooves of each group of anti-loosening grooves. After alignment, one end of each group of anti-loosening blocks is automatically inserted into each group of anti-loosening grooves, and the other end stays in the mounting groove of the anti-loosening block. When the threaded connection between the hydraulic cylinder body and the cylinder cover tends to loosen, the inner walls of the mounting groove of the anti-loosening block and the anti-loosening groove generate extrusion stress on the anti-loosening block, so that relative rotation cannot occur between the hydraulic cylinder body and the cylinder cover, thereby achieving the purpose of preventing the threads between the hydraulic cylinder body and the cylinder cover from loosening, and further achieving the purpose of the cylinder cover exploding, providing explosion-proof measures for the hydraulic cylinder cover for the explosion-proof hydraulic power pliers. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the utility model;

[0018] Figure 2 This is a schematic diagram of the cross-sectional structure of the utility model;

[0019] Figure 3 for Figure 2 A schematic diagram of the structure enlargement in the middle;

[0020] Figure 4 It is a schematic diagram of the structure of the hydraulic cylinder body;

[0021] Figure 5 Schematic diagram of the cylinder head structure.

[0022] In the figure: hydraulic cylinder body 1, cylinder head 2, anti-loosening block mounting groove 3, anti-loosening groove 4, anti-loosening block 5, connecting rod hole 6, connecting rod 7, anti-loosening spring 8, pull-out ring 9, sealing groove 10, sealing gasket 11, hydraulic oil through hole 12, piston 13, piston rod 14, piston spring 15. DETAILED DESCRIPTION

[0023] In order to make the purpose and technical solution of the utility model clearly and completely described, and the advantages more clearly understood, the embodiments of the utility model are further described in detail in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are part of the embodiments of the utility model, not all of the embodiments, and are only used to explain the embodiments of the utility model, and are not used to limit the embodiments of the utility model. All other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] Embodiment 1

[0025] See also Figure 1-Figure 3The utility model provides a technical solution: a flameproof hydraulic power tongs, comprising: a hydraulic cylinder body 1, the hydraulic cylinder body 1 is installed on the casing of the flameproof hydraulic power tongs through a fixing ring, a cylinder cover 2 is installed on the top of the hydraulic cylinder body 1 through a threaded connection, a plurality of groups of anti-loosening block installation grooves 3 are opened on the inner wall of the cylinder cover 2, one end of an anti-loosening block 5 is movably inserted in the anti-loosening block installation groove 3, and the other end of the anti-loosening block 5 is movably inserted in the anti-loosening groove 4, the anti-loosening groove 4 is opened on the surface of the hydraulic cylinder body 1, and a plurality of groups of anti-loosening grooves 4 are opened, and a plurality of groups of anti-loosening grooves 4 correspond to a plurality of groups of anti-loosening block installation grooves 3 one by one, and a plurality of groups of anti-loosening block installation grooves 3 and a plurality of groups of anti-loosening grooves 4 are distributed circumferentially about the hydraulic cylinder body 1.

[0026] In actual use, threads are provided on the inner wall of the cylinder cover 2 and the outer wall of the hydraulic cylinder body 1. When installing the cylinder cover 2 on the hydraulic cylinder body 1, firstly, each group of anti-loosening blocks 5 are completely retracted into each group of anti-loosening block mounting grooves 3, and then the cylinder cover 2 is tightened on the hydraulic cylinder body 1 through threaded connection. After tightening, the relative position of the hydraulic cylinder body 1 and the cylinder cover 2 is fine-tuned to align each group of anti-loosening block mounting grooves 3 with each group of anti-loosening grooves 4. After alignment, one end of each group of anti-loosening blocks 5 is automatically inserted into each group of anti-loosening grooves 4, and the other end is stopped. It remains in the anti-loosening block installation groove 3. When the threaded connection between the hydraulic cylinder body 1 and the cylinder head 2 tends to loosen, the inner walls of the anti-loosening block installation groove 3 and the anti-loosening groove 4 generate extrusion stress on the anti-loosening block 5, so that the hydraulic cylinder body 1 and the cylinder head 2 cannot rotate relative to each other, thereby preventing the threads between the hydraulic cylinder body 1 and the cylinder head 2 from loosening, and further achieving the purpose of the cylinder head 2 exploding, providing an explosion-proof measure for the hydraulic cylinder head of the explosion-proof hydraulic power tongs.

[0027] Embodiment 2

[0028] On the basis of Example 1, in order to achieve simultaneous operation of the positions of each group of anti-loosening blocks 5, the anti-loosening blocks 5 are in a rectangular block structure, and one end of the anti-loosening block 5 extending into the anti-loosening block mounting groove 3 is fixed with a connecting rod 7 and an anti-loosening spring 8, and the end of the anti-loosening spring 8 away from the anti-loosening block 5 is fixed on the inner wall of the groove body of the anti-loosening block mounting groove 3. A plurality of groups of connecting rod holes 6 are provided on the surface of the cylinder head 2, and the plurality of groups of connecting rod holes 6 are respectively connected with the plurality of groups of anti-loosening block mounting grooves 3. The end of the connecting rod 7 away from the anti-loosening block 5 is movably inserted in the connecting rod hole 6, and the end of the connecting rod 7 away from the anti-loosening block 5 extends from the top of the connecting rod hole 6. The connecting rod 7 is in a circular rod structure, and a plurality of groups of connecting rods 7 are provided. The ends of the plurality of groups of connecting rods 7 extending out of the connecting rod holes 6 are fixed with the same group of pull-out rings 9, and the pull-out rings 9 are in a ring-shaped plate structure.

[0029] When it is necessary for each group of anti-loosening blocks 5 to be completely retracted into each group of anti-loosening block mounting grooves 3, it is only necessary to pull the pull ring 9 in the direction away from the cylinder head 2, and the pull ring 9 drives each group of connecting rods 7 to extend out of the connecting rod holes 6, and then drives the anti-loosening blocks 5 to move in the same direction through the connecting rods 7, so that each group of anti-loosening blocks 5 are completely retracted into each group of anti-loosening block mounting grooves 3. At this time, the anti-loosening spring 8 is in a compressed state; when it is necessary for one end of each group of anti-loosening blocks 5 to be inserted into each group of anti-loosening block mounting grooves 3, it is only necessary to loosen the pull ring 9 after the cylinder head 2 is tightened on the hydraulic cylinder body 1, and then fine-tune the relative position of the hydraulic cylinder body 1 and the cylinder head 2 so that the anti-loosening block mounting groove 3 is aligned with the nearest group of anti-loosening grooves 4. Then, the anti-loosening spring 8 pushes one end of the anti-loosening block 5 into the anti-loosening groove 4 under the action of its own elastic force, so that one end of each group of anti-loosening blocks 5 can be inserted into each group of anti-loosening block mounting grooves 3, and then the position of each group of anti-loosening blocks 5 can be operated simultaneously.

[0030] Embodiment 3

[0031] On the basis of the second embodiment, in order to prevent the hydraulic oil in the hydraulic cylinder body 1 from leaking from the gap between the hydraulic cylinder body 1 and the cylinder cover 2, a sealing groove 10 is opened on the inner wall of the cylinder cover 2. The sealing groove 10 is in the form of a circular groove body. A sealing gasket 11 is fixed in the sealing groove 10. One end of the sealing gasket 11 extends out of the sealing groove 10 and abuts against the surface of the hydraulic cylinder body 1.

[0032] One end of the sealing gasket 11 extending out of the sealing groove 10 abuts against the surface of the hydraulic cylinder body 1. The sealing gasket 11 is made of a highly elastic rubber material, thereby sealing the gap between the hydraulic cylinder body 1 and the cylinder cover 2 to prevent the hydraulic oil in the hydraulic cylinder body 1 from leaking from the gap between the hydraulic cylinder body 1 and the cylinder cover 2.

[0033] Embodiment 4

[0034] On the basis of Example 3, in order to change the length of the piston rod 14 extending from the surface of the hydraulic cylinder body 1, a hydraulic oil through hole 12 is opened on the surface of the hydraulic cylinder body 1, and one end of the hydraulic pipe is connected to the position where the hydraulic oil through hole 12 is opened in the hydraulic cylinder body 1, and the other end of the hydraulic pipe is connected to the oil storage cylinder. A piston rod 14 is movably inserted on the surface of the hydraulic cylinder body 1, and one end of the piston rod 14 extends into the hydraulic cylinder body 1. A piston 13 is fixed to the end of the piston rod 14 extending into the hydraulic cylinder body 1. A piston spring 15 is sleeved on the rod body of the part of the piston rod 14 extending into the hydraulic cylinder body 1, and one end of the piston spring 15 is against the surface of the piston 13, and the other end of the piston spring 15 is against the inner wall of the hydraulic cylinder body 1.

[0035] The oil pump of the oil storage cylinder pumps the hydraulic oil in the oil storage cylinder through the hydraulic pipe and the hydraulic oil through hole 12 into the hydraulic cylinder body 1, and the position where the hydraulic oil is pumped is the side of the piston 13 away from the piston rod 14. As the hydraulic oil pressure in the hydraulic cylinder body 1 increases, the hydraulic oil pushes the piston 13 to move toward the side close to the piston rod 14, so that the length of the piston rod 14 extending from the hydraulic cylinder body 1 becomes longer. At this time, the piston spring 15 is gradually compressed. When the oil pump of the oil storage cylinder stops running, the oil pressure in the hydraulic cylinder body 1 no longer increases. At this time, the piston spring 15 pushes the piston 13 away from the piston rod 14 under the action of its own elasticity. On the one hand, this makes the hydraulic oil in the hydraulic cylinder body 1 flow back into the oil storage cylinder, and on the other hand, it also shortens the distance that the piston rod 14 extends from the hydraulic cylinder body 1, thereby achieving the purpose of changing the length of the piston rod 14 extending from the surface of the hydraulic cylinder body 1.

[0036] In actual use, threads are provided on the inner wall of the cylinder cover 2 and the outer wall of the hydraulic cylinder body 1. When the cylinder cover 2 is installed on the hydraulic cylinder body 1, firstly, each group of anti-loosening blocks 5 are completely retracted into each group of anti-loosening block installation grooves 3, and then the cylinder cover 2 is tightened on the hydraulic cylinder body 1 through threaded connection. After tightening, the relative position of the hydraulic cylinder body 1 and the cylinder cover 2 is fine-tuned to align each group of anti-loosening block installation grooves 3 with each group of anti-loosening grooves 4. After alignment, one end of each group of anti-loosening blocks 5 is automatically inserted into each group of anti-loosening grooves 4, and the other end stays in the anti-loosening block installation groove 3. When the hydraulic cylinder body When the threaded connection between the hydraulic cylinder body 1 and the cylinder head 2 tends to loosen, the inner walls of the anti-loosening block installation groove 3 and the anti-loosening groove 4 generate extrusion stress on the anti-loosening block 5, so that the hydraulic cylinder body 1 and the cylinder head 2 cannot rotate relative to each other, thereby achieving the purpose of preventing the threads between the hydraulic cylinder body 1 and the cylinder head 2 from loosening, and further achieving the purpose of the cylinder head 2 from exploding, providing an explosion-proof measure for the hydraulic cylinder head of the explosion-proof hydraulic power tongs; when it is necessary for each group of anti-loosening blocks 5 to be completely retracted into each group of anti-loosening block installation grooves 3, it is only necessary to move the anti-loosening block 5 away from the cylinder head 2. The pull ring 9 is pulled in the direction, and the pull ring 9 drives each group of connecting rods 7 to extend from the connecting rod holes 6, and then drives the anti-loosening blocks 5 to move in the same direction through the connecting rods 7, so that each group of anti-loosening blocks 5 are completely retracted into each group of anti-loosening block mounting grooves 3. At this time, the anti-loosening spring 8 is in a compressed state; when one end of each group of anti-loosening blocks 5 needs to be inserted into each group of anti-loosening block mounting grooves 3, it is only necessary to loosen the pull ring 9 after the cylinder cover 2 is tightened on the hydraulic cylinder body 1, and then fine-tune the relative position of the hydraulic cylinder body 1 and the cylinder cover 2 so that the anti-loosening block mounting groove 3 is aligned with the nearest group of anti-loosening grooves 4. The anti-loosening spring 8 pushes one end of the anti-loosening block 5 into the anti-loosening groove 4 under its own elastic force, so that one end of each group of anti-loosening blocks 5 can be inserted into each group of anti-loosening block installation grooves 3, and then the positions of each group of anti-loosening blocks 5 can be operated simultaneously; one end of the sealing gasket 11 extending out of the sealing groove 10 abuts against the surface of the hydraulic cylinder body 1, and the sealing gasket 11 is made of highly elastic rubber material, thereby blocking the gap between the hydraulic cylinder body 1 and the cylinder cover 2, preventing the hydraulic oil in the hydraulic cylinder body 1 from leaking from the gap between the hydraulic cylinder body 1 and the cylinder cover 2;The oil pump of the oil storage cylinder pumps the hydraulic oil in the oil storage cylinder through the hydraulic pipe and the hydraulic oil through hole 12 into the hydraulic cylinder body 1, and the position where the hydraulic oil is pumped is the side of the piston 13 away from the piston rod 14. As the hydraulic oil pressure in the hydraulic cylinder body 1 increases, the hydraulic oil pushes the piston 13 to move toward the side close to the piston rod 14, so that the length of the piston rod 14 extending from the hydraulic cylinder body 1 becomes longer. At this time, the piston spring 15 is gradually compressed. When the oil pump of the oil storage cylinder stops running, the oil pressure in the hydraulic cylinder body 1 no longer increases. At this time, the piston spring 15 pushes the piston 13 away from the piston rod 14 under its own elastic action. On the one hand, this makes the hydraulic oil in the hydraulic cylinder body 1 flow back into the oil storage cylinder, and on the other hand, it also shortens the distance that the piston rod 14 extends from the hydraulic cylinder body 1, thereby achieving the purpose of changing the length of the piston rod 14 extending from the surface of the hydraulic cylinder body 1. ;

[0037] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A flameproof hydraulic power tongs, comprising: A hydraulic cylinder body (1) is mounted on a casing of a flameproof hydraulic power tongs via a fixing ring, a cylinder cover (2) is mounted on the top of the hydraulic cylinder body (1) via a threaded connection, and is characterized in that: a plurality of groups of anti-loosening block mounting grooves (3) are provided on the inner wall of the cylinder cover (2), one end of an anti-loosening block (5) is movably inserted into the anti-loosening block mounting groove (3), and the other end of the anti-loosening block (5) is movably inserted into an anti-loosening groove (4), and the anti-loosening groove (4) is provided on the surface of the hydraulic cylinder body (1).

2. The explosion-proof hydraulic power tongs according to claim 1, characterized in that: The anti-loosening grooves (4) are provided in a plurality of groups, the plurality of groups of anti-loosening grooves (4) and the plurality of groups of anti-loosening block installation grooves (3) correspond one to one, and the plurality of groups of anti-loosening block installation grooves (3) and the plurality of groups of anti-loosening grooves (4) are all distributed in a circular pattern with respect to the hydraulic cylinder body (1).

3. The explosion-proof hydraulic power tongs according to claim 1, characterized in that: The anti-loosening block (5) is in a rectangular block structure. A connecting rod (7) and an anti-loosening spring (8) are fixed to one end of the anti-loosening block (5) extending into the anti-loosening block installation groove (3). The end of the anti-loosening spring (8) away from the anti-loosening block (5) is fixed to the inner wall of the anti-loosening block installation groove (3).

4. The explosion-proof hydraulic power tongs according to claim 3 are characterized in that: A plurality of connecting rod holes (6) are provided on the surface of the cylinder cover (2), and the plurality of connecting rod holes (6) are respectively connected to the plurality of anti-loosening block mounting grooves (3). One end of the connecting rod (7) away from the anti-loosening block (5) is movably inserted into the connecting rod hole (6), and one end of the connecting rod (7) away from the anti-loosening block (5) extends out from the top of the connecting rod hole (6). The connecting rod (7) is a circular rod structure.

5. The explosion-proof hydraulic power tongs according to claim 4, characterized in that: The connecting rods (7) are provided in a plurality of groups, and one end of the connecting rods (7) extending out of the connecting rod holes (6) is fixed with the same group of pull-out rings (9), which are in an annular plate-shaped structure.

6. The flameproof hydraulic power tongs according to claim 1, characterized in that: A sealing groove (10) is provided on the inner wall of the cylinder cover (2). The sealing groove (10) is in the form of a circular groove. A sealing gasket (11) is fixed in the sealing groove (10). One end of the sealing gasket (11) extends out of the sealing groove (10) and abuts against the surface of the hydraulic cylinder body (1).

7. The explosion-proof hydraulic power tongs according to claim 1, characterized in that: A hydraulic oil through hole (12) is provided on the surface of the hydraulic cylinder body (1), one end of a hydraulic pipe is connected to the position where the hydraulic oil through hole (12) is provided on the hydraulic cylinder body (1), and the other end of the hydraulic pipe is connected to an oil storage cylinder.

8. The explosion-proof hydraulic power tongs according to claim 1, characterized in that: A piston rod (14) is movably inserted on the surface of the hydraulic cylinder body (1), one end of the piston rod (14) extends into the hydraulic cylinder body (1), and a piston (13) is fixed to the end of the piston rod (14) extending into the hydraulic cylinder body (1), and a piston spring (15) is sleeved on the rod body of the portion of the piston rod (14) extending into the hydraulic cylinder body (1), one end of the piston spring (15) abuts against the surface of the piston (13), and the other end of the piston spring (15) abuts against the inner wall of the hydraulic cylinder body (1).

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