A hydraulic nut

Abstract

The present invention belongs to the technical field of hydraulic nuts, and specifically is a hydraulic nut, comprising a cylinder body, an oil groove is provided on the top of the cylinder body, the cylinder body is slidably connected with a piston through the oil groove, an internal thread is provided in the middle of the piston, an oil inlet hole and an oil outlet hole connected to the oil groove are provided on the cylinder body, a nut sleeve is rotatably connected with a nut sleeve at the bottom of the cylinder body, a sliding block is fixedly connected to the outer edge of the nut sleeve, a sliding groove is provided at the corresponding position of the cylinder body and the sliding block, and the sliding groove matches the size of the sliding block; the present invention diverts the introduced hydraulic oil through a branch pipe, so that part of the hydraulic oil enters the sliding groove through the branch pipe, the sliding block slides along the sliding groove, and the nut sleeve drives the nut to rotate, so that there is no need to manually rotate the nut sleeve, manpower is saved, work efficiency is improved, and the physical strength of workers is reduced after long-term work, resulting in insufficient force to tighten the nut, so that the nut is not tightened in place.

Description

Technical Field

[0001] The invention belongs to the technical field of hydraulic nuts, in particular to a hydraulic nut. Background Art

[0002] Hydraulic nuts are used for bolts that need to be frequently disassembled and assembled; pre-tightening of oversized bolts; locking of large workpieces, etc., and can be used as hydraulic interference connection disassembly tools. Installing or removing bearings on tapered shafts or sleeves is usually a difficult and time-consuming project. The use of hydraulic nuts can improve work efficiency and reduce such problems. The principle is that hydraulic oil is input into the nut by a high-pressure oil pump to generate a force that pushes the piston, which makes installing or removing bearings effortless, accurate and safe.

[0003] When pre-tightening the two flanges, the operator generally first passes the bolts through the corresponding assembly holes on the two flanges at the same time, then screws the nut on one end of the bolt, then sets the nut sleeve on the hydraulic nut on the nut, and then sets the cylinder body on the nut sleeve, while the end of the bolt exposed to the nut is surrounded by the cylinder body, the operator then manually screws the internal thread of the piston connected to the inner wall of the cylinder body to the end of the bolt exposed to the nut, starts the hydraulic pump, and the hydraulic oil enters the inner cavity of the cylinder through the oil inlet pipe under the action of the hydraulic pump, and then the hydraulic oil pushes the piston out of the cylinder body, and the piston is subjected to an upward force. Since the piston thread is connected to one end of the bolt, the two flanges are tightened in cooperation with the threaded sleeve pulling the bolt;

[0004] After the two flanges are pre-tightened by the hydraulic nut, the nut sleeve needs to be manually rotated so that the nut sleeve drives the nut to be tightened. Manual tightening consumes manpower and has low work efficiency. In addition, the physical strength of the workers will decrease after working for a long time, which may easily lead to the nut not being tightened properly. Summary of the invention

[0005] In order to make up for the deficiencies of the prior art, the present invention proposes a hydraulic nut, which solves the problem that after the two flanges are pre-tightened by the hydraulic nut, the nut sleeve needs to be manually rotated, so that the nut sleeve drives the nut to be tightened. Manual tightening consumes manpower and has low work efficiency. In addition, the physical strength of the workers will decrease after working for a long time, which may easily lead to the problem that the nut is not tightened properly.

[0006] The technical solution adopted by the present invention to solve its technical problem is: a hydraulic nut described in the present invention includes a cylinder body, an oil groove is provided on the top of the cylinder body, the cylinder body is slidably connected to a piston through the oil groove, an internal thread is provided in the middle of the piston, an oil inlet hole and an oil outlet hole connected to the oil groove are provided on the cylinder body, a nut sleeve is rotatably connected to the bottom of the cylinder body, a slider is fixedly connected to the outer edge of the nut sleeve, a slide groove is provided at the corresponding position of the cylinder body and the slider, the slide groove matches the size of the slider, a branch pipe is connected between the oil inlet hole and the slide groove, and an oil drain pipe connected to the slide groove is provided on the outer side of the cylinder body.

[0007] Preferably, the chute is spiral.

[0008] Preferably, the pitch of the spiral groove is equal to the pitch of the internal thread.

[0009] Preferably, the slide groove is an annular groove.

[0010] Preferably, the slider is rectangular.

[0011] Preferably, the side of the sliding block facing the branch pipe is configured as a concave surface.

[0012] Preferably, the sliding block is semicircular.

[0013] Preferably, a torsion spring is sleeved on the nut sleeve, one end of the torsion spring is fixedly connected to the nut sleeve, and the other end of the torsion spring is fixedly connected to the cylinder body.

[0014] Preferably, a rubber pad is fixedly connected to the inner side of the nut sleeve.

[0015] Preferably, a side of the rubber pad facing the bottom of the nut sleeve is configured as an inclined surface.

[0016] The beneficial effects of the present invention are as follows:

[0017] 1. The hydraulic nut described in the present invention diverts the hydraulic oil introduced through a branch pipe, so that part of the hydraulic oil enters the slide groove through the branch pipe, so that the slider slides along the slide groove, and the nut sleeve drives the nut to rotate, so that there is no need to manually rotate the nut sleeve, saving manpower, improving work efficiency, and reducing the physical decline of workers after long-term work, resulting in insufficient force to tighten the nut, so that the nut cannot be tightened properly.

[0018] 2. The hydraulic nut described in the present invention increases the moving distance of the slider in the slider by providing a spiral slide groove, so that the number of turns that the slider can drive the nut sleeve to rotate is increased, so that when the bolt is pulled a long distance, the nut sleeve can rotate multiple turns so that the nut can be tightened. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below in conjunction with the accompanying drawings.

[0020] Figure 1 is a stereogram of the present invention;

[0021] Figure 2 It is a structural schematic diagram of a first embodiment of a chute;

[0022] Figure 3 is a structural schematic diagram of a second embodiment of the chute;

[0023] Figure 4 is a structural schematic diagram of a second embodiment of a slider;

[0024] In the figure: 1. cylinder body; 11. oil tank; 12. oil inlet hole; 13. oil outlet hole; 2. piston; 21. internal thread; 3. nut sleeve; 31. slider; 32. slide groove; 33. branch pipe; 34. oil drain pipe; 35. torsion spring; 36. rubber pad. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical means and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are described clearly and completely. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] The hydraulic nut proposed by the present invention solves the problem that after two flanges are pre-tightened by a hydraulic nut, the nut sleeve 3 needs to be manually rotated so that the nut sleeve 3 drives the nut to be tightened. Manual tightening consumes manpower and has low work efficiency. Moreover, the physical strength of the manpower will decrease after working for a long time, which may easily lead to the problem that the nut is not tightened properly.

[0027] The technical solution in the embodiment of the present invention is to solve the above technical problems, and the overall idea is as follows: when hydraulic oil is introduced into the oil tank 11 through the hydraulic pump, the introduced hydraulic oil is diverted through the branch pipe 33, so that part of the hydraulic oil enters the slide groove 32 through the branch pipe 33. Under the continuous operation of the hydraulic pump, the hydraulic oil squeezes the slider 31 in the slide groove 32, so that the slider 31 slides along the slide groove 32, so that the slider 31 drives the nut sleeve 3 to rotate the rod, so that the nut sleeve 3 drives the nut to rotate, so that the hydraulic oil pushes the piston 2 to be squeezed out of the cylinder body 1, and the nut can be tightened on the bolt, so that the two flanges are tightened and fixed to each other.

[0028] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0029] like Figures 1 to 4As shown, a hydraulic nut described in the present invention comprises a cylinder body 1, an oil groove 11 is provided on the top of the cylinder body 1, a piston 2 is slidably connected to the cylinder body 1 through the oil groove 11, an internal thread 21 is provided in the middle of the piston 2, an oil inlet hole 12 and an oil outlet hole 13 connected to the oil groove 11 are provided on the cylinder body 1, a nut sleeve 3 is rotatably connected to the bottom of the cylinder body 1, a slider 31 is fixedly connected to the outer edge of the nut sleeve 3, a slide groove 32 is provided at a corresponding position of the cylinder body 1 and the slider 31, the slide groove 32 matches the size of the slider 31, a branch pipe 33 is connected between the oil inlet hole 12 and the slide groove 32, and an oil drain pipe 34 connected to the slide groove 32 is provided on the outer side of the cylinder body 1;

[0030] When pre-tightening the two flanges, the operator generally first passes the bolts through the corresponding assembly holes on the two flanges at the same time, then screws the nut on one end of the bolt, and then sleeves the nut sleeve 3 on the hydraulic nut on the nut, and then sleeves the cylinder body 1 on the nut sleeve 3, and at the same time, the end of the bolt exposed to the nut is surrounded by the cylinder body 1, and the operator manually screws the internal thread 21 of the piston 2 connected to the inner wall of the cylinder body 1 to the end of the bolt exposed to the nut, and starts the hydraulic pump. Under the action of the hydraulic pump, the hydraulic oil enters the inner cavity of the cylinder body 1 through the oil inlet pipe, and then the hydraulic oil pushes the piston 2 out of the cylinder body 1. The piston 2 will be subjected to an upward force. Since the piston 2 is threadedly connected to one end of the bolt, the two flanges are tightened in cooperation with the threaded sleeve pulling the bolt; after the two flanges are pre-tightened by the hydraulic nut, it is still necessary to manually rotate the nut sleeve 3 so that the nut sleeve 3 drives the nut to tighten, and manual tightening consumes manpower and has low work efficiency. In addition, the physical strength of the human will decrease after working for a long time, which may easily lead to the nut not being tightened in place;

[0031] The hydraulic oil introduced into the oil tank 11 is discharged through the drain pipe 34 and collected for reuse, thereby eliminating the need to manually rotate the nut sleeve 32, thereby saving manpower, improving work efficiency, and reducing the risk of workers' physical decline due to long-term work, resulting in insufficient force to tighten the nut, and thus causing the nut to fail to be tightened properly.

[0032] In the first embodiment of the chute 32, the chute 32 is spiral; when working, Figure 2As shown, by providing a spiral groove 32, the moving distance of the slider 31 in the groove 32 is increased, so that the number of turns that the slider 31 can drive the nut sleeve 3 to rotate is increased, so that when the bolt is pulled a long distance, the nut sleeve 3 can rotate multiple turns so that the nut can be tightened.

[0033] As an embodiment of the present invention, the pitch of the spiral groove is equal to the pitch of the internal thread 21; when working, Figure 2 As shown, through the pitch of the spiral groove and the pitch of the internal thread 21, the pitch of the bolt matching the internal thread 21 is also the same as the pitch of the spiral groove, so that when the slider 31 drives the nut sleeve 3 to move the nut on the bolt, since the rotation angle of the slider 31 in the spiral groove is the same as the rotation angle of the nut, the moving direction and moving distance of the nut sleeve 3 driven by the slider 31 are the same as the moving direction and moving distance of the nut, so that the nut is relatively still with the nut sleeve 3 when rotating and moving, thereby reducing the friction between the nut and the nut sleeve 3, reducing the wear of the nut sleeve 3, and thus improving the service life of the hydraulic nut.

[0034] The second embodiment of the slide groove 32 is that the slide groove 32 is an annular groove; when working, Figure 3 As shown, by setting the annular slide groove 32, the friction between the slider 31 and the slide groove 32 is small, the wear of the slide groove 32 and the slider 31 is reduced, the service life of the hydraulic nut is increased, and when the hydraulic oil flows into the slide groove 32, the loss of hydraulic oil power is small, so that the force of the hydraulic oil to push the sliding movement is greater, which facilitates the tightening of the nut.

[0035] In the first embodiment of the slider 31, the slider 31 is rectangular; when working, Figure 3 As shown, by providing a rectangular slider 31 , the slider 31 and the slide groove 32 have multiple surface contacts, so that the slide groove 32 and the slider 31 fit better, reducing the occurrence of deflection and looseness of the slider 31 in the slide groove 32 .

[0036] As an embodiment of the present invention, the side of the slider 31 facing the branch pipe 33 is set as a concave surface; when working, Figure 3 As shown, by setting a concave surface, when the hydraulic oil flows into the slide groove 32, the lowest point of the concave surface is subjected to the greatest force and the force is more concentrated. The hydraulic oil can better push the slider 31 to move along the slide groove 32, reducing the loss of hydraulic oil force. If one side of the slider 31 is subjected to a greater force, the slider 31 may be offset in the slide groove 32.

[0037] The second embodiment of the slider 31 is that the slider 31 is semicircular; when working, Figure 4As shown, by setting a semicircular slider 31, the arc surface of the slider 31 is in contact with the slide groove 32. When the slider 31 slides in the slide groove 32, the entire arc surface is subjected to relatively uniform force. If the slider 31 is of other shapes, the multiple surfaces of the slider 31 in contact with the slide groove 32 may be subjected to uneven force, causing the side subjected to greater force to wear faster, resulting in a loose connection between the slider 31 and the slide groove 32, causing the hydraulic oil to penetrate from the connection between the slider 31 and the slide groove 32, thereby reducing the effect of the hydraulic oil pushing the slider 31.

[0038] As an embodiment of the present invention, a torsion spring 35 is sleeved on the nut sleeve 3, one end of the torsion spring 35 is fixedly connected to the nut sleeve 3, and the other end of the torsion spring 35 is fixedly connected to the cylinder body 1; when working, Figure 3 As shown, by setting a torsion spring 35, the torsion spring 35 is driven to twist when the nut sleeve 3 rotates. When the hydraulic oil is stopped from entering the slide groove 32, the torsion spring 35 rotates and resets, so that the torsion spring 35 drives the nut sleeve 3 to rotate and resets the nut sleeve 3, thereby facilitating the next use.

[0039] As an embodiment of the present invention, a rubber pad 36 is fixedly connected to the inner side of the nut sleeve 3; when working, Figure 1 As shown, by setting the rubber pad 36, the gap between the nut sleeve 3 and the nut is reduced, so that there can be a greater friction between the nut and the rubber pad 36, so that the nut sleeve 3 can better drive the nut to rotate. At the same time, the soft rubber pad 36 can reduce the wear on the nut sleeve 3 and the bolt, thereby increasing the service life of the hydraulic nut.

[0040] As an embodiment of the present invention, the side of the rubber pad 36 facing the bottom of the nut sleeve 3 is set as an inclined surface; when working, Figure 1 As shown, by setting the inclined surface, when the nut is inserted into the nut sleeve 3, the nut can be better inserted along the inclined surface of the rubber pad 36, reducing the obstruction of the rubber pad 36 to the insertion of the nut, until the nut is in the middle of the rubber pad 36 so that the rubber pad 36 can be in close contact with the nut.

[0041] The specific workflow is as follows:

[0042] When pre-tightening the two flanges, the operator generally first passes the bolts through the corresponding assembly holes on the two flanges at the same time, then screws the nuts on one end of the bolts, then puts the nut sleeve 3 on the hydraulic nut on the nut, and then puts the cylinder body 1 on the nut sleeve 3, and at the same time, the end of the bolt exposed to the nut is surrounded by the cylinder body 1. The operator then manually screws the internal thread 21 of the piston 2 connected to the inner wall of the cylinder body 1 to the end of the bolt exposed to the nut, starts the hydraulic pump, and the hydraulic oil enters the inner cavity of the cylinder body 1 through the oil inlet pipe under the action of the hydraulic pump. Then the hydraulic oil pushes the piston 2 out of the cylinder body 1, and the piston 2 is subjected to an upward force. Since the piston 2 is threadedly connected to one end of the bolt, the two flanges are tightened with the cooperation of the threaded sleeve pulling the bolt. When the hydraulic oil is introduced into the oil tank 11 through the hydraulic pump, The branch pipe 33 diverts the hydraulic oil introduced, so that part of the hydraulic oil enters the slide groove 32 through the branch pipe 33. Under the continuous operation of the hydraulic pump, the hydraulic oil squeezes the slider 31 in the slide groove 32, so that the slider 31 slides along the slide groove 32, so that the slider 31 drives the nut sleeve 3 to rotate the rod, so that the nut sleeve 3 drives the nut to rotate, so that the hydraulic oil pushes the piston 2 to be squeezed out from the cylinder body 1 while the nut can be tightened on the bolt, so that the two flanges are tightened and fixed to each other, and the hydraulic oil introduced into the slide groove 32 is discharged through the oil drain pipe 34 and collected for reuse, thereby eliminating the need to manually rotate the nut sleeve 3, saving manpower, improving work efficiency, and reducing the physical decline of workers after long-term work, resulting in insufficient force to tighten the nut, resulting in the occurrence of the nut not being tightened in place.

[0043] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A hydraulic nut, comprising a cylinder body, an oil groove is provided on the top of the cylinder body, a piston is slidably connected to the cylinder body through the oil groove, an internal thread is provided in the middle of the piston, an oil inlet hole and an oil outlet hole connected to the oil groove are provided on the cylinder body, and a nut sleeve is rotatably connected to the bottom of the cylinder body, characterized in that: The outer edge of the nut sleeve is fixedly connected with a slider, a slide groove is provided at the corresponding position of the cylinder body and the slider, the slide groove matches the size of the slider, a branch pipe is connected between the oil inlet hole and the slide groove, and an oil drain pipe connected to the slide groove is provided on the outer side of the cylinder body; The slide groove is spiral or annular; when the slide groove is spiral, the pitch of the spiral slide groove is equal to the pitch of the internal thread; the slider is rectangular or semicircular; the side of the slider facing the branch pipe is set as a concave surface; a torsion spring is sleeved on the nut sleeve, one end of the torsion spring is fixedly connected to the nut sleeve, and the other end of the torsion spring is fixedly connected to the cylinder body; By setting a branch pipe, when hydraulic oil is introduced into the oil tank through the hydraulic pump, the introduced hydraulic oil is diverted through the branch pipe, so that part of the hydraulic oil enters the slide groove through the branch pipe. Under the continuous operation of the hydraulic pump, the hydraulic oil squeezes the slider in the slide groove, so that the slider slides along the slide groove, so that the slider drives the nut sleeve to rotate, and the nut sleeve drives the nut to rotate, so that the hydraulic oil pushes the piston to be squeezed out of the cylinder body, and the nut can be tightened on the bolt, so that the two flanges are tightened and fixed to each other, and the hydraulic oil introduced into the slide groove is discharged through the oil drain pipe and collected for reuse; A rubber pad is fixedly connected to the inner side of the nut sleeve; The side of the rubber pad facing the bottom of the nut sleeve is set as an inclined surface.

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