Drawing device

Abstract

The utility model relates to a puller. Comprising a center connecting block, a penetrating threaded hole is formed in the middle of the top of the center connecting block, a center threaded rod is arranged in the penetrating threaded hole, a connecting threaded hole is formed in the side portion of the center connecting block, and a distance adjusting unit for clamping a workpiece is arranged on the connecting threaded hole; the distance adjusting unit comprises an upper adjusting unit part and a lower adjusting unit part; the lower adjusting unit part is provided with a clamping piece matched with a contact surface of a workpiece; the drawing tool has the advantage of being good in universality, workpieces of different sizes can be used, and meanwhile when the contact face of the workpiece can be a plane or an arc face, drawing operation can be achieved as well.

Description

Technical Field

[0001] The utility model relates to the technical field of dry ice recovery, in particular to a puller. Background Art

[0002] There are many interference fits between shafts and holes in mechanical assembly. During the inspection, repair and maintenance operations of mechanical equipment, the problem of separating interference-fitted shafts and holes is often encountered. For this, common methods include knocking or using a puller, etc. Among them, knocking may cause damage to parts, and the existing pullers have poor applicability. For example: Chinese Patent Grant Publication No.: CN101434061B, Patent Name: Puller, which discloses that when the puller works, first place the lower claw of the pull claw at the position where the object needs to be clamped, and then place the stepped surface on the screw hole body under the upper claw for hinged cooperation. By rotating the screw, the screw hole body moves to drive the pull claw to move together, so as to achieve the purpose of pulling out the object clamped by the lower claw. When the space around the object to be pulled is very small, the pull claws can be clamped one by one first, then hold the handle and place the screw and the screw hole body under the upper claw for hinged connection, and then perform pulling. If it is estimated that a large pulling force is required, more pull claws can be used for clamping and then pulling. Combining the above content and the attached Figure 2 and Figure 3 It can be seen that it adopts the method of detachable pull claws to use different numbers of pull claws for different workpieces; however, in the actual working process, the diameters (or widths) of workpieces often vary, and the contact surfaces between the pull claws and the workpieces can be flat surfaces or arc surfaces, etc.; thus, the existing pullers have the defect of poor versatility. Summary of the Utility Model

[0003] In order to make up for the above deficiencies, the utility model provides a puller, aiming to improve the problem of poor versatility of the existing puller.

[0004] To achieve the above object, the utility model provides the following technical solutions:

[0005] A puller, which includes a central connection block. A through-threaded hole is provided at the middle position of the top of the central connection block. A central threaded rod is arranged in the through-threaded hole. A connection threaded hole is provided on the side of the central connection block, and a distance adjustment unit for clamping the workpiece is arranged on the connection threaded hole; the distance adjustment unit includes an upper adjustment unit part and a lower adjustment unit part; a clamping member adapted to the contact surface of the workpiece is arranged on the lower adjustment unit part.

[0006] The beneficial effects of the present utility model are as follows: By setting the distance adjustment unit, the distance to the central threaded rod can be adjusted, so as to separate the shaft and the hole for workpieces of different sizes, thereby improving its applicability; further, by setting the clamping member adapted to the contact surface of the workpiece, the distance adjustment unit can fix the workpiece, which not only facilitates the subsequent separation of the shaft and the hole, but also further improves its versatility.

[0007] Preferably, the connection threaded holes and the distance adjustment units are in a one-to-one correspondence relationship, and there are at least two connection threaded holes, and the two are arranged on the corresponding two sides of the central connection block.

[0008] Preferably, there are at least three connection threaded holes, two of which are arranged on the corresponding two sides of the central connection block, and the other is arranged on the front side or the rear side of the central connection block.

[0009] Preferably, the upper adjustment unit includes a cross beam screw rod. One end of the cross beam screw rod is threadedly connected to the connection threaded hole. A longitudinal rod is movably arranged on the cross beam screw rod, and a first locking nut is sleeved on the cross beam screw rod outside the longitudinal rod; threaded holes are respectively arranged at both ends of the longitudinal rod, and the threaded hole at the upper end of the longitudinal rod meshes with the cross beam screw rod; the lower adjustment unit is arranged on the threaded hole at the lower end of the longitudinal rod.

[0010] Preferably, the lower adjustment unit includes a lower threaded rod meshing with the threaded hole at the lower end of the longitudinal rod. A clamping member is arranged at the inner end of the lower threaded rod, a first hexagonal head is arranged at the outer end of the lower threaded rod, and a second locking nut is arranged outside the meshing part of the lower threaded rod and the threaded hole at the lower end of the longitudinal rod.

[0011] Preferably, when the contact part of the clamping member and the workpiece is a plane, the clamping member includes a clamping body and an internal threaded hole arranged on the clamping body and adapted to the lower threaded rod, and the upper surface of the clamping body is a plane.

[0012] Preferably, when the contact part of the clamping member and the workpiece is an arc surface or a conical surface, the clamping member includes a clamping body and an internal threaded hole arranged on the clamping body and adapted to the lower threaded rod, and a groove is arranged on the upper surface of the clamping body, and the edge of the upper part of the groove forms a linear contact or a multi-point contact with the contact part of the workpiece.

[0013] Preferably, a second hexagonal head is arranged at the top of the central threaded rod.

[0014] A puller made according to the above solution. By setting a central connection block for connecting the central threaded rod and the distance adjustment unit, the distance adjustment unit is used to adapt to the workpiece. This adaptation includes adjusting the distance between the central threaded rod and the distance adjustment unit, and achieving a firm fixation between the clamping member in the distance adjustment unit and the contact surface of the workpiece. The above structural form can effectively improve the versatility of the present invention. Specifically, the upper adjustment unit of the present invention is used to adjust the distance between the longitudinal rod and the central threaded rod, and the lower adjustment unit is used to adjust the distance between the clamping member and the workpiece, so as to achieve the purpose of fixing the workpiece. A through-threaded hole is provided in the central connection block, and the central threaded rod applies pressure to the shaft through this through-threaded hole. At the same time, the upper adjustment unit can make the longitudinal rod approach the workpiece, and limit and fix the workpiece through the clamping member in the lower adjustment unit, so as to achieve the pulling operation. The present invention has the characteristics of good versatility, can be used for workpieces of different sizes, and can also achieve the pulling operation when the contact surface of the workpiece can be a plane or an arc surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic structural diagram of the present invention;

[0016] Figure 2 is a schematic structural diagram of the central connection block of the present invention;

[0017] Figure 3 is a schematic structural diagram of the longitudinal rod of the present invention;

[0018] Figure 4 is a schematic structural diagram of the clamping member of the present invention;

[0019] Figure 5 is a schematic structural diagram of another clamping member of the present invention.

[0020] Legend:

[0021] 1. Central connection block; 2. Central threaded rod; 3. Cross beam screw rod; 4. Longitudinal rod; 5. Clamping member; 6. First locking nut; 7. Lower threaded rod; 8. First hexagonal head; 9. Second locking nut; 10. Groove; 11. Second hexagonal head. DETAILED DESCRIPTION OF THE INVENTION

[0022] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0023] Refer toFigures 1 - 5 , a puller of the present utility model, which includes a central connection block 1. A through-threaded hole is provided at the middle position of the top of the central connection block 1. A central threaded rod 2 is provided in the through-threaded hole. A connection threaded hole is provided on the side of the central connection block 1, and a distance adjustment unit for clamping the workpiece is provided on the connection threaded hole; the distance adjustment unit includes an upper adjustment unit part and a lower adjustment unit part; a clamping part 5 adapted to the contact surface of the workpiece is provided on the lower adjustment unit part. The present utility model provides a central connection block 1, with a through-threaded hole provided at the middle position of its top for installing the central threaded rod 2, and a connection threaded hole provided on its side for setting the distance adjustment unit. The connection threaded hole is a blind hole and only serves the function of connection and fixation. The distance adjustment unit is at least two and is symmetrically arranged; the upper adjustment unit part is mainly used for adjusting the distance greatly, and the lower adjustment unit part is mainly used for fine adjustment. Especially, through the fine adjustment of the lower adjustment unit part, the fixation of the workpiece by the clamping part 5 can be realized, so as to facilitate the separation of the shaft and the hole.

[0024] Further, the connection threaded holes and the distance adjustment units have a one-to-one correspondence relationship. The connection threaded holes are at least two, and the two are provided on the opposite sides of the central connection block 1. The connection threaded holes and the distance adjustment units have a one-to-one correspondence relationship. In actual use, the connection threaded holes can be evenly distributed around the central connection block 1, and the distance adjustment units can be set according to actual needs; further, in the actual use process, the distance adjustment units are at least two and are symmetrically arranged to realize the firm fixation of the workpiece.

[0025] Further, the connection threaded holes are at least three, two of which are provided on the opposite sides of the central connection block 1, and the other one is provided on the front side or the rear side of the central connection block 1.

[0026] Further, the upper adjustment unit part includes a cross beam screw rod 3. One end of the cross beam screw rod 3 is threadedly connected to the connection threaded hole. A longitudinal rod 4 is movably arranged on the cross beam screw rod 3. A first locking nut 6 is sleeved on the cross beam screw rod 3 outside the longitudinal rod 4; threaded holes are respectively provided at both ends of the longitudinal rod 4. The upper threaded hole of the longitudinal rod 4 is meshed with the cross beam screw rod 3; the lower adjustment unit part is arranged on the lower threaded hole of the longitudinal rod 4. Through the above setting, the adjustment of the distance between the longitudinal rod 4 and the central threaded rod 2 (or to the workpiece) can be realized; when the size of the workpiece is large, the longitudinal rod 4 can be moved along the distal end of the cross beam screw rod 3. When the size of the workpiece is small, the longitudinal rod 4 can be moved along the proximal end (the proximal end refers to the end close to the central threaded rod 2) of the cross beam screw rod 3. When it moves to the appropriate position, it can be locked by the corresponding first locking nut 6; preferably, the upper adjustment unit part in the present utility model is mainly used for adjusting the position of the longitudinal rod 4 according to the size of the workpiece.

[0027] Further, the lowering and adjusting unit includes a lower threaded rod 7 engaged with the threaded hole at the lower end of the longitudinal rod 4. A clamping member 5 is provided at the inner end of the lower threaded rod 7, a first hexagonal head 8 is provided at the outer end of the lower threaded rod 7, and a second locking nut 9 is provided outside the engagement between the lower threaded rod 7 and the threaded hole at the lower end of the longitudinal rod 4. In the present utility model, the lower threaded rod 7 can rotate and move in the threaded hole at the lower end of the longitudinal rod 4 to bring the contact surface of the clamping member 5 into contact with the contact surface of the workpiece, thereby achieving the fixation of the workpiece.

[0028] Further, when the contact part of the clamping member 5 with the workpiece is a plane, the clamping member 5 includes a clamping body and an internal threaded hole provided on the clamping body and adapted to the lower threaded rod 7, and the upper surface of the clamping body is a plane.

[0029] Further, when the contact part of the clamping member 5 with the workpiece is an arc surface or a conical surface, the clamping member 5 includes a clamping body and an internal threaded hole provided on the clamping body and adapted to the lower threaded rod 7, and a groove 10 is provided on the upper surface of the clamping body, and the edge of the upper part of the groove 10 forms a linear contact or a multi-point contact with the contact part of the workpiece.

[0030] Further, a second hexagonal head 11 is provided at the top of the central threaded rod 2.

[0031] The working principle of the present utility model: When using the present utility model, the distance adjusting unit is installed on the connecting threaded hole according to the actual working conditions, and the distance adjusting unit can be two, three or four; after installation, according to the size of the workpiece, rotate the longitudinal rod 4 to make the longitudinal rod 4 move along the crossbeam screw rod 3, and when it moves to the appropriate position, lock it with the first locking nut 6; rotate the central threaded rod 2 through the second hexagonal head 11 to make the central threaded rod 2 extend downward until it contacts the center of the upper part of the shaft; then select a suitable clamping member 5 according to the matching position of the workpiece and the clamping member 5. When the contact part of the workpiece is a plane, select a clamping member with a plane upper surface of the clamping body; when the contact part of the workpiece is an arc surface or a conical surface, select a clamping member with a groove 10 on the upper surface of the clamping body; then make the upper surface of the clamping member closely contact the contact surface of the workpiece by adjusting the first hexagonal head 8, thereby increasing the friction force and further achieving the firm fixation of the workpiece; after the above adjustments are completed, tighten all the first locking nuts 6 and the second locking nuts 9, and finally slowly rotate the central threaded rod 2 to remove the workpiece.

[0032] Finally, it should be noted that the above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements on some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A puller, characterized in that: The extractor includes a central connection block (1). A through-threaded hole is provided at the middle position of the top of the central connection block (1). A central threaded rod (2) is provided in the through-threaded hole. A connection threaded hole is provided on the side of the central connection block (1), and a distance adjustment unit for clamping the workpiece is provided on the connection threaded hole. The distance adjustment unit includes an upper adjustment unit part and a lower adjustment unit part. A clamping member (5) adapted to the contact surface of the workpiece is provided on the lower adjustment unit part.

2. The extractor according to claim 1, characterized in that: The connection threaded hole and the distance adjustment unit are in a one-to-one correspondence. There are at least two connection threaded holes, and the two are arranged on the corresponding two sides of the central connection block (1).

3. The extractor according to claim 2, wherein: There are at least three connection threaded holes, two of which are arranged on the corresponding two sides of the central connection block (1), and the other is arranged on the front side or the rear side of the central connection block (1).

4. A puller according to any one of claims 1-3, characterized in that: The upper adjustment unit part includes a cross beam screw rod (3). One end of the cross beam screw rod (3) is threadedly connected to the connection threaded hole. A longitudinal rod (4) is movably arranged on the cross beam screw rod (3). A first locking nut (6) is sleeved on the cross beam screw rod (3) outside the longitudinal rod (4). Threaded holes are respectively provided at both ends of the longitudinal rod (4). The upper threaded hole of the longitudinal rod (4) is meshed with the cross beam screw rod (3). The lower adjustment unit part is arranged on the lower threaded hole of the longitudinal rod (4).

5. The puller according to claim 4, characterized in that: The lower adjustment unit part includes a lower threaded rod (7) meshed with the lower threaded hole of the longitudinal rod (4). A clamping member (5) is provided at the inner end of the lower threaded rod (7). A first hexagonal head (8) is provided at the outer end of the lower threaded rod (7). A second locking nut (9) is provided outside the meshing part of the lower threaded rod (7) and the lower threaded hole of the longitudinal rod (4).

6. The extractor according to claim 5, characterized in that: When the contact part of the clamping member (5) and the workpiece is a plane, the clamping member (5) includes a clamping body and an internal threaded hole provided on the clamping body and adapted to the lower threaded rod (7). The upper surface of the clamping body is a plane.

7. A puller according to claim 5, wherein: When the contact part of the clamping member (5) and the workpiece is an arc surface or a conical surface, the clamping member (5) includes a clamping body and an internal threaded hole provided on the clamping body and adapted to the lower threaded rod (7). A groove (10) is provided on the upper surface of the clamping body. The edge of the upper part of the groove (10) forms a linear contact or a multi-point contact with the contact part of the workpiece.

8. A puller according to claim 1, characterized in that: A second hexagonal head (11) is provided at the top of the central threaded rod (2).

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