CN217317833U

CN217317833U - Reduce puller of lead screw frictional force

Info

Publication number: CN217317833U
Application number: CN202220388847.1U
Authority: CN
Inventors: 姜杭生; 郑求义; 李�浩; 严豪冠
Original assignee: Hangzhou Haichao Rubber Co Ltd
Current assignee: Hangzhou Haichao Rubber Co Ltd
Priority date: 2022-02-24
Filing date: 2022-02-24
Publication date: 2022-08-30
Anticipated expiration: 2032-02-24

Abstract

The utility model relates to a draw the horse field, especially relate to a reduce screw rod frictional force draw horse. The puller comprises a bracket, a screw rod, a plurality of pulling feet, a top and a plane bearing; the bracket is provided with a threaded hole, the screw rod is screwed with the threaded hole, and the pull feet are respectively connected with the bracket; the bottom end of the screw rod is provided with a matching head, the matching head is connected with a tight ring of the plane bearing, and the lower surface of the loose ring of the plane bearing is attached to the upper surface of the top head. This puller is through setting up plane bearing and top to cooperation head and top are connected with plane bearing's tight ring and loose ring respectively, and then only receive the less frictional force that plane bearing produced when making the lead screw rotate, guarantee that the lead screw is rotatory lighter.

Description

Reduce puller of lead screw frictional force

Technical Field

The utility model relates to a draw the horse field, especially relate to a reduce drawing horse of lead screw frictional force.

Background

The puller is a tool for disassembling various machines. The puller is suitable for overhauling railway vehicles, mechanical installation, mine maintenance, building engineering support and lifting and descending of heavy objects, and can also be used for disassembling round workpieces such as belt pulleys, gears, bearings and the like in various mechanical equipment. The puller is used for doing linear tension when working, is convenient and labor-saving, has stable performance, and can also do lifting, jacking, straightening, pressure test and other work.

The Chinese utility model patent application (publication No. CN211388591U, published: 20200901) discloses a novel bearing puller device, which comprises a left puller seat, a right puller seat, a supporting screw rod, a supporting frame and a mandril. The bearing is fixed with supporting screw on the left side draw horse seat and the right side draw horse seat among this novel bearing draws horse device, supporting screw's top sets up in the supporting screw standing groove at support frame both ends, through adjusting the position of support frame in the supporting screw standing groove, can be used for adjusting the left side and draw the distance between the horse seat and the right side draw the horse seat, so that use the bearing of different specifications, it is together fixed through fixing bolt to adjust between the back left side draw horse seat and the right side draw the horse seat, place the platform at the bearing with the bearing that the middle part is fixed with the pivot, drive the ejector pin through rotatory rotating head and rotate, it is ejecting with the pivot in the bearing. In a word, this bearing draws horse device structural design is reasonable, and is small, can come the bearing that adapts to different specifications and the breaking away from of pivot by automatically regulated size, is fit for using widely.

The prior art has the following defects: the existing puller is directly contacted with the shaft end through a matching head, the pulling foot heads of a plurality of pulling feet hook a workpiece to be pulled out, and then a screw rod rotates to drive the pulling foot heads to move upwards relative to the matching head so as to pull out the workpiece to be pulled out; in the mode, the matching head can rotate relative to the shaft end along with the rotation of the screw rod, so that the screw rod rotates to generate larger friction resistance with the shaft end, and the screw rod is not beneficial to rotation.

Disclosure of Invention

The utility model aims at: to above-mentioned problem, propose through setting up plane bearing and top to cooperation head and top are connected with plane bearing's tightring and loose ring respectively, and then only receive the less frictional force that plane bearing produced when making the lead screw rotate, guarantee the rotatory lighter horse that draws of reduction lead screw frictional force of lead screw.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a screw extractor for reducing the friction force of a screw rod comprises a bracket, the screw rod, a plurality of pull feet, a top and a plane bearing; the bracket is provided with a threaded hole, the screw rod is screwed with the threaded hole, and the pull legs are respectively connected with the bracket; the bottom end of the screw rod is provided with a matching head, the matching head is connected with a tight ring of the plane bearing, and the lower surface of the loose ring of the plane bearing is attached to the upper surface of the top head.

Preferably, the fitting head comprises a fitting cylindrical surface and a fitting end surface; the matching cylindrical surface penetrates through the inner hole of the plane bearing, and the matching end surface is attached to the upper surface of the tightening ring of the plane bearing.

Preferably, the matching cylindrical surface is in transition fit or interference fit with an inner hole of a tight ring of the plane bearing, and an inner hole of a loose ring of the plane bearing of the matching cylindrical surface is in clearance fit.

Preferably, the plug is provided with a receiving bore and the mating head passes through the planar bearing bore and is located in the receiving bore.

Preferably, the bottom surface of the plug is chamfered.

Preferably, the foot-rests are provided with sliding holes, and the sliding holes are in sliding fit with the brackets.

Preferably, the slide hole is a square hole.

Preferably, the pull foot comprises a pull foot rod and a pull foot head; the foot-pulling head is positioned at the bottom end of the foot-pulling rod and protrudes out of the inner side of the foot-pulling rod, and the upper surface of the foot-pulling head is attached to the corresponding bottom surface of the workpiece to be pulled out.

Preferably, the threaded hole is positioned in the center of the bracket, and the plurality of pull feet are symmetrically distributed along the center of the bracket.

The utility model adopts the above technical scheme a reduce draw horse of lead screw frictional force's advantage is:

when the puller is used: 1) the lower surface of the plug is contacted with the shaft end, and a plurality of pull foot tensioning ends are respectively attached to the corresponding surfaces of the workpieces to be pulled out; 2) the rotating screw rod is matched with the head to drive the tightening ring of the plane bearing to rotate relative to the top head; 3) the plurality of pulling feet move upwards relative to the screw rod so as to pull out the workpiece to be pulled out. In the mode, the matching head and the ejecting head are respectively connected with the tightening ring and the loosening ring of the plane bearing, so that the screw rod is only subjected to smaller friction force generated by the plane bearing when rotating, and the screw rod is ensured to rotate more easily.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic structural diagram of the mating cylindrical surface and the mating end surface.

Fig. 3 is a schematic structural view of the plug.

Detailed Description

The following describes in detail embodiments of the present invention with reference to the accompanying drawings.

Example 1

The screw extractor for reducing the friction force of the screw rod as shown in figure 1 comprises a bracket 1, a screw rod 2, a plurality of pull feet 3, a top head 4 and a plane bearing 5; the bracket 1 is provided with a threaded hole 11, the screw rod 2 is screwed with the threaded hole 11, and the pull feet 3 are respectively connected with the bracket 1; the bottom end of the screw rod 2 is provided with a matching head 21, the matching head 21 is connected with a tight ring of the plane bearing 5, and the lower surface of a loose ring of the plane bearing 5 is attached to the upper surface of the top head 4. When the puller is used: 1) the lower surface of the top head 4 is contacted with the shaft end, and the tensioning ends of the pull feet 3 are respectively attached to the corresponding surfaces of the workpieces to be pulled out; 2) the screw rod 2 is rotated, and the matching head 21 drives the tightening ring of the plane bearing 5 to rotate relative to the top head 4; 3) the plurality of pulling feet 3 move upwards relative to the screw rod 2 so as to pull out the workpiece to be pulled out. In this way, the matching head 21 and the top head 4 are respectively connected with the tightening ring and the loosening ring of the plane bearing 5, so that the screw rod 2 is only subjected to smaller friction force generated by the plane bearing 5 when rotating, and the screw rod 2 is ensured to rotate more easily.

As shown in fig. 2, the fitting head 21 includes a fitting cylindrical surface 22 and a fitting end surface 23; the matching cylindrical surface 22 passes through the inner hole of the plane bearing 5, and the matching end surface 23 is attached to the upper surface of the tight ring of the plane bearing 5.

The fit cylindrical surface 22 is in transition fit or interference fit with the inner hole of the tight ring of the plane bearing 5, so that the fit cylindrical surface 22 drives the tight ring of the plane bearing 5 to rotate, and the fit cylindrical surface 22 is in clearance fit with the inner hole of the loose ring of the plane bearing 5.

As shown in fig. 3, the plug 4 is provided with a receiving hole 41, and the fitting head 21 passes through the inner hole of the flat bearing 5 and is located in the receiving hole 41. The bottom surface of the top head 4 is of a chamfer structure.

As shown in fig. 1, the pulling foot 3 is provided with a sliding hole 31, and the sliding hole 31 is in sliding fit with the bracket 1. The foot 3 is slid on the stand 1 through the slide hole 31 to a set distance to suit the size of the work piece to be pulled out. The slide hole 31 is a square hole.

The pull foot 3 comprises a pull foot rod 32 and a pull foot head 33; the pull foot head 33 is positioned at the bottom end of the pull foot rod 32 and protrudes out of the inner side of the pull foot rod 32, and the upper surface of the pull foot head 33 is attached to the corresponding bottom surface of the workpiece to be pulled out so as to be convenient for lifting and pulling out the workpiece to be pulled out.

The threaded hole 11 is positioned in the center of the bracket 1, and the pull feet 3 are symmetrically distributed along the center of the bracket 1.

Claims

1. The screw extractor for reducing the friction force of the screw rod is characterized by comprising a bracket (1), the screw rod (2), a plurality of pulling feet (3), a top (4) and a plane bearing (5); the bracket (1) is provided with a threaded hole (11), the screw rod (2) is screwed with the threaded hole (11), and the pull legs (3) are respectively connected with the bracket (1); the bottom end of the screw rod (2) is provided with a matching head (21), the matching head (21) is connected with a tight ring of the plane bearing (5), and the lower surface of the loose ring of the plane bearing (5) is attached to the upper surface of the top (4).

2. Puller for reducing friction of lead screw according to claim 1, characterized in that the fitting head (21) comprises a fitting cylindrical surface (22) and a fitting end surface (23); the matching cylindrical surface (22) penetrates through an inner hole of the plane bearing (5), and the matching end surface (23) is attached to the upper surface of a tight ring of the plane bearing (5).

3. The puller for reducing the friction force of the screw rod as recited in claim 2, wherein the fitting cylindrical surface (22) is in transition fit or interference fit with the inner hole of the tight ring of the plane bearing (5), and the inner hole of the loose ring of the plane bearing (5) of the fitting cylindrical surface (22) is in clearance fit.

4. Screw friction reducing puller according to claim 1, characterized in that the head (4) is provided with a receiving hole (41), the mating head (21) passing through the inner hole of the flat bearing (5) and being located in the receiving hole (41).

5. The screw extractor for reducing the friction force of the screw rod as recited in claim 1, wherein the bottom surface of the top head (4) is of a chamfer structure.

6. The puller for reducing the friction force of the screw rod as recited in claim 1, wherein the pulling foot (3) is provided with a sliding hole (31), and the sliding hole (31) is in sliding fit with the bracket (1).

7. The puller for reducing friction force of a screw rod as recited in claim 6, wherein the sliding hole (31) is a square hole.

8. The puller for reducing friction force of a screw rod as recited in claim 1, characterized in that the pulling foot (3) comprises a pulling foot rod (32) and a pulling foot head (33); the pull foot head (33) is positioned at the bottom end of the pull foot rod (32) and protrudes out of the inner side of the pull foot rod (32), and the upper surface of the pull foot head (33) is attached to the corresponding bottom surface of a workpiece to be pulled out.

9. The puller for reducing the friction force of the screw rod as recited in claim 1, wherein the threaded hole (11) is positioned at the center of the bracket (1), and the plurality of pulling feet (3) are symmetrically distributed along the center of the bracket (1).