An electric tool for preassembling a hydraulic pipe joint sleeve

Abstract

The application discloses an electric tool for preassembling a hydraulic pipe joint sleeve, comprising a shell, a motor and a speed reducer in transmission connection with the motor are arranged in the shell, a motor control switch is arranged on the shell, an output shaft of the speed reducer is a hollow shaft and extends to the outside of the shell at the front end, a center column is inserted into the center of the hollow shaft, a stud is fixed on the center shaft of the top of the front end of the center column in an axial direction, the outer diameter of the stud is smaller than the outer diameter of the center column, a counterbore is arranged in the center of the top end of the stud, and an inverted conical surface is arranged at the bottom of the counterbore; the front end of the hollow shaft is arranged as an internal hexagonal sleeve in an axial direction. Compared with the prior art, the electric tool can precontact the sleeve to the hydraulic pipe, ensures the sealing between the sleeve and the hydraulic pipe, and then can be directly screwed to the nut after the hydraulic pipe joint is quickly docked; the application has the advantages of simple structure, similar structure to the existing electric wrench, convenient and fast use, and convenient popularization and use.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of auxiliary tools for hydraulic pipe joints, in particular to an electric tool for preassembling a hydraulic pipe joint sleeve. BACKGROUND

[0002] As an important accessory and basic component of the hydraulic system of engineering machinery, the hydraulic pipe joint is widely used in the connection of pipe joints in high-end hydraulic systems in the aviation, aerospace, weapons, ships, automobiles, mining machinery, machine tools and other industries, and is related to military and civilian fields.

[0003] The traditional hydraulic pipe joint sleeve has a ring of sealing edges in structure, which belongs to metal contact sealing. Its function is to cut the edges of the hydraulic pipe joint sleeve into the surface layer of the oil pipe to achieve metal contact sealing when the oil pipe and the pipe joint are assembled and connected, and the nut is tightened. The existing hydraulic pipe joint installation sleeve is first sleeved on the front end of the hydraulic pipe, then the hydraulic pipe and the front end of the sleeve are inserted into the hydraulic pipe joint, then the hydraulic pipe joint or the nut is rotated by hand to tighten the nut on the hydraulic pipe joint, and finally the nut is tightened with two wrenches to extrude the tapered surface of the hydraulic pipe joint body, so that the edges of the hydraulic pipe joint sleeve cut into the surface layer of the oil pipe to achieve metal contact sealing. However, since the sleeve is initially sleeved on the hydraulic pipe, it is easy to deviate during the tightening of the nut, so that a gap exists between the sleeve and the surface layer of the hydraulic pipe when the nut is tightened to the tightest, causing sealing failure. In addition, the hydraulic pipe needs to be always ensured to reach the bottom of the hydraulic pipe joint during the tightening of the nut, so that the sleeve can be completely pressed on the hydraulic pipe to achieve the effect of contact sealing.

[0004] Therefore, if a tool can be used to contact seal the sleeve on the hydraulic pipe first, and then connect the hydraulic pipe joint, the above problems will not occur. SUMMARY

[0005] The purpose of the present application is to solve the problems existing in the prior art and provide an electric tool for preassembling a hydraulic pipe joint sleeve.

[0006] To achieve the above purpose, the present application is implemented according to the following technical scheme:

[0007] An electric tool for preassembling hydraulic pipe joint sleeve, comprising a shell, a motor and a speed reducer in transmission connection with the motor are arranged in the shell, a motor control switch is arranged on the shell, the output shaft of the speed reducer is a hollow shaft and its front end extends to the outside of the shell, a center column is inserted in the center of the hollow shaft, the outer diameter of the center column is smaller than the inner diameter of the hollow shaft, the rear end of the center column extends to the outside of the shell at the rear end of the hollow shaft and is fixed on the shell, a stud for being threadedly connected with the screw cap on the hydraulic pipe joint is fixed on the top center of the front end of the center column, the outer diameter of the stud is smaller than the outer diameter of the center column, a counterbore for accommodating the hydraulic pipe and the sleeve is arranged in the center of the top end of the stud, the inner diameter of the counterbore is larger than the outer diameter of the hydraulic pipe, the outer diameter of the front end of the sleeve is smaller than the inner diameter of the counterbore and the outer diameter of the rear end of the sleeve is larger than the inner diameter of the counterbore, a reverse taper surface is arranged at the bottom of the counterbore; the front end of the hollow shaft is arranged as an inner hexagonal sleeve matched with the outer wall of the screw cap, the inner hexagonal sleeve is in clearance fit with the screw cap and the length of the inner hexagonal sleeve is larger than the height of the screw cap.

[0008] As a further technical scheme of the present application, the length of the stud is equal to or smaller than the length of the internal thread in the screw cap.

[0009] As a further technical scheme of the present application, the depth of the counterbore is equal to or smaller than the length of the sleeve.

[0010] As a further technical scheme of the present application, the distance between the top end of the stud and the top end of the inner hexagonal sleeve is smaller than the height of the screw cap.

[0011] Preferably, the motor control switch comprises a motor forward rotation control switch and a motor reverse rotation control switch.

[0012] Compared with the prior art, the electric tool of the present application can pre-contact the sleeve to the hydraulic pipe to ensure the sealing between the sleeve and the hydraulic pipe, and then the nut can be directly tightened after the hydraulic pipe joint is quickly docked; the present application has simple structure, the whole structure is similar to the existing electric wrench, is convenient and fast to use, and is convenient to popularize and use. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 is a structural schematic view of the present application.

[0014] Figure 2 is a partial enlarged schematic view of Figure 1 . DETAILED DESCRIPTION

[0015] In order to make the purpose, technical scheme and advantages of the present application more clear and explicit, the present application is further described in detail below in combination with embodiments. The specific embodiments described herein are only used to explain the present application and do not limit the present application.

[0016] As Figure 1 , Figure 2As shown, the embodiment provides an electric tool for preassembling hydraulic pipe joint sleeve, which comprises a shell 1, a motor and a speed reducer connected with the motor are arranged in the shell (the motor and the speed reducer are not shown in the figure, the overall structure of the shell 1 of the embodiment is consistent with the existing electric wrench, and the position and transmission relationship of the motor and the speed reducer are also consistent, so the embodiment will not be described in detail), a motor control switch is arranged on the shell 1, such as Figure 1 As shown, the motor control switch comprises a motor forward rotation control switch 8 and a motor reverse rotation control switch 9, the output shaft of the speed reducer is a hollow shaft 2 (the mounting structure of the hollow shaft and the output shaft of the existing speed reducer is consistent) and the front end of the hollow shaft 2 extends to the outside of the shell 1, a center column 3 is inserted into the center of the hollow shaft 2, the outer diameter of the center column 3 is smaller than the inner diameter of the hollow shaft 2, the rear end of the center column 3 extends to the outside of the shell 1 at the rear end of the hollow shaft 2 and is fixed on the shell 1, a screw column 4 for thread connection with the screw cap on the hydraulic pipe joint 11 is fixed on the top center of the front end of the center column 3, the outer diameter of the screw column 4 is smaller than the outer diameter of the center column 3, a counterbore 5 for accommodating the hydraulic pipe 10 and the sleeve 12 is arranged on the top center of the front end of the screw column 4, the inner diameter of the counterbore 5 is greater than the outer diameter of the hydraulic pipe 10, the outer diameter of the front end of the sleeve 12 is smaller than the inner diameter of the counterbore 5 and the outer diameter of the rear end of the sleeve 12 is greater than the inner diameter of the counterbore, a reverse taper surface 6 is arranged on the bottom of the counterbore 5, the structure of the whole screw column 4 is consistent with the original hydraulic pipe joint structure, so that after the sleeve 12 of the embodiment is installed on the hydraulic pipe 10, the subsequent joint connection can be directly carried out; the front end of the hollow shaft 2 is arranged as an inner hexagonal sleeve 7 matched with the outer wall of the screw cap 11, the inner hexagonal sleeve 7 is gap-fitted with the screw cap 11 and the length of the inner hexagonal sleeve 7 is greater than the height of the screw cap 11, and the outer wall of the screw cap 11 can slide in the inner hexagonal sleeve 7.

[0017] In order to ensure that the sleeve 12 is better in contact with the hydraulic pipe 10, the length of the screw column 4 is less than or equal to the length of the internal thread in the screw cap 11, and the depth of the counterbore 5 is less than or equal to the length of the sleeve 12.

[0018] In actual use, in order to facilitate taking and placing the screw cap 11, the distance between the top end of the screw column 4 and the top end of the inner hexagonal sleeve 7 is less than the height of the screw cap 11, so that the screw cap 11 can be pushed into the inner hexagonal sleeve 7, and a part of the screw cap 11 will protrude from the top end of the inner hexagonal sleeve 7, ensuring that the inner hexagonal sleeve 7 can clamp a part of the screw cap 11; in addition, after the installation of the sleeve 12 is completed, the screw cap 11 is withdrawn from the inner hexagonal sleeve 7, and the screw cap 11 can also be conveniently taken off.

[0019] The working principle of the electric tool for preassembling hydraulic pipe joint sleeve of the embodiment is as follows: Figure 1First, the front end of the hydraulic pipe 10 is inserted into the nut 11 through the hole in the rear end of the nut 11, the sleeve 12 is sleeved on the front end of the hydraulic pipe 10, then the nut 11 is installed into the internal hex sleeve 7, the front end of the hydraulic pipe 10 is inserted into the bottom of the counterbore 5, then the motor forward rotation control switch 8 is pressed to make the motor drive the hollow shaft 2 of the speed reducer to rotate forward, the internal hex sleeve 7 drives the nut 11 to rotate, and the nut 11 slides inward along the internal hex sleeve 7 during the rotation process, so that the sleeve 12 is gradually pressed into the counterbore 5, until the front end of the sleeve 12 is pressed into the bottom of the counterbore 5, due to the existence of the inverted taper surface 6, the entire sleeve 12 is tightly contacted and sealed on the hydraulic pipe 10, the entire operation process can be completed by holding the electric tool with one hand and holding the hydraulic pipe 10 with the other hand; after the sleeve 12 is installed, the motor reverse rotation control switch 9 is pressed to make the motor drive the hollow shaft 2 of the speed reducer to rotate reversely, the internal hex sleeve 7 drives the nut 11 to rotate, and the nut 11 slides outward along the internal hex sleeve 7 during the rotation process, then the nut 11 and the hydraulic pipe 10 with the installed sleeve 12 are taken out, then the hydraulic pipe joint can be quickly butt-jointed and the nut 11 can be directly tightened.

[0020] The technical scheme of the present application is not limited to the above specific embodiments, and any technical modification made according to the technical scheme of the present application falls within the protection scope of the present application.

Claims

1. A power tool for preassembling hydraulic pipe joint sleeve, comprising a housing, a motor and a speed reducer in transmission connection with the motor are arranged in the housing, and a motor control switch is arranged on the housing, characterized in that: The output shaft of the speed reducer is a hollow shaft, the front end of which extends outside the shell, a center column is inserted into the center of the hollow shaft, the outer diameter of the center column is smaller than the inner diameter of the hollow shaft, the rear end of the center column extends outside the shell at the rear end of the hollow shaft and is fixed on the shell, a stud for thread connection with the screw cap on the hydraulic pipe joint is fixed on the top center of the front end of the center column, the outer diameter of the stud is smaller than the outer diameter of the center column, a counterbore for accommodating the hydraulic pipe and a sleeve is formed in the center of the top end of the stud, the inner diameter of the counterbore is larger than the outer diameter of the hydraulic pipe, the outer diameter of the front end of the sleeve is smaller than the inner diameter of the counterbore and the outer diameter of the rear end of the sleeve is larger than the inner diameter of the counterbore, a reverse taper is arranged at the bottom of the counterbore; the front end of the hollow shaft is provided with an inner hexagonal sleeve matching the outer wall of the screw cap, the inner hexagonal sleeve is in clearance fit with the screw cap and the length of the inner hexagonal sleeve is greater than the height of the screw cap; the depth of the counterbore is less than or equal to the length of the sleeve; the distance between the top end of the stud and the top end of the inner hexagonal sleeve is less than the height of the screw cap; the length of the stud is less than or equal to the length of the internal thread in the screw cap.

2. The electric tool for preassembling a hydraulic pipe joint sleeve according to claim 1, characterized by: The motor control switch comprises a motor forward rotation control switch and a motor reverse rotation control switch.

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