CN216098542U

CN216098542U - Clamping tool for pipe machining

Info

Publication number: CN216098542U
Application number: CN202122493541.0U
Authority: CN
Inventors: 冯金伟
Original assignee: Kaiping Jinte Sanitary Ware Co ltd
Current assignee: Kaiping Jinte Sanitary Ware Co ltd
Priority date: 2021-10-15
Filing date: 2021-10-15
Publication date: 2022-03-22
Anticipated expiration: 2031-10-15

Abstract

The utility model discloses a clamping tool for processing a pipe, which comprises an installation seat, two sliding parts, a moving part and a driving mechanism, wherein the two sliding parts can be installed on the installation seat in a sliding manner along the mutually approaching or separating direction, one end, close to the two sliding parts, of each sliding part is provided with a clamping part, one end, far away from the two sliding parts, of each sliding part is provided with an inclined surface, the moving part can be movably arranged on the installation seat, the moving part is provided with two control parts corresponding to the inclined surfaces, in the moving process of the moving part, the two control parts can abut against the corresponding inclined surfaces to push the two sliding parts to synchronously slide along the mutually approaching direction, and the driving mechanism is arranged on the installation seat and is in transmission connection with the moving part so as to control the moving part to move. The clamping tool for processing the pipe is simple in structure, simple to operate when the pipe needs to be clamped, and time and labor are saved.

Description

Clamping tool for pipe machining

Technical Field

The utility model relates to a clamping device, in particular to a clamping tool for pipe machining.

Background

When cutting, punching or port flanging and the like are carried out on the pipe, a clamping device is required to be used for fixing the pipe, so that the pipe is prevented from being moved or rotated randomly in the machining process to influence the machining quality.

The existing clamping devices are various, however, most of the clamping devices are complex in structure, troublesome in operation and time and labor consuming when the pipes need to be clamped.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the clamping tool for pipe machining is simple in structure, simple to operate when the pipe needs to be clamped, and time and labor are saved.

According to the embodiment of the utility model, the clamping tool for processing the pipe comprises:

a mounting seat;

the two sliding parts can be arranged on the mounting seat in a sliding manner along the direction of approaching or separating from each other, a clamping part is arranged at one end of the two sliding parts, which is close to each other, and an inclined surface is arranged at one end of the two sliding parts, which is far away from each other;

the moving part is movably arranged on the mounting seat and is provided with two control parts corresponding to the inclined surfaces, and in the moving process of the moving part, the two control parts can be abutted against the corresponding inclined surfaces to push the two sliding parts to synchronously slide along the mutually approaching directions;

and the driving mechanism is arranged on the mounting seat and is in transmission connection with the moving part so as to control the moving part to move.

The clamping tool for pipe machining provided by the embodiment of the utility model at least has the following technical effects:

the mount pad can be installed on the lathe of processing such as cutting to tubular product, punch a hole or port turn-ups, process to tubular product and when needing to press from both sides tight tubular product, place tubular product between two clamping parts, then start actuating mechanism, actuating mechanism can control the removal portion and remove towards setting for the direction, thereby the removal portion drives the inclined plane on the sliding part that two control part butt correspond, when actuating mechanism control removal portion continues to remove towards setting for the direction, two control parts can promote two sliding parts and slide along the direction synchronous that is close to each other, clamping parts on two sliding parts can be close to each other, thereby press from both sides tight tubular product. After the pipe is machined, the driving mechanism controls the moving part to move in the direction opposite to the set direction, so that the clamping part can release the clamping of the pipe, and finally the machined pipe is taken down. According to the clamping tool for processing the pipe, the structure is simple, when the pipe needs to be clamped, the pipe only needs to be placed between the two clamping parts, and then the driving mechanism is started, so that the clamping tool is convenient to operate, and time and labor are saved.

According to some embodiments of the present invention, the two sliding portions are slidably mounted on the upper end of the mounting base along a first horizontal direction, the two inclined surfaces extend obliquely downward in a direction away from each other, the moving portion is movably disposed on the mounting base up and down, and the two control portions are disposed at the bottom end of the moving portion and above the corresponding inclined surfaces.

According to some embodiments of the utility model, the control portion is of a cylindrical structure and an axial direction of the control portion extends in a second horizontal direction perpendicular to the first horizontal direction, an outer side wall of the control portion abutting the corresponding inclined surface during downward movement of the moving portion.

According to some embodiments of the utility model, the control part is rotatably mounted on the moving part around its axis.

According to some embodiments of the utility model, the mounting seat is provided with a mounting portion between the two sliding portions, and an elastic restoring member is provided between the mounting portion and the sliding portions, and the elastic restoring member is used for keeping the two sliding portions in a state of being away from each other.

According to some embodiments of the utility model, the elastic return member comprises a plurality of springs disposed between the mounting portion and the sliding portion, the springs extending in the first horizontal direction.

According to some embodiments of the present invention, the end surface of the mounting portion close to the sliding portion is provided with a plurality of guide rods, the guide rods extend along the first horizontal direction, the sliding portion is correspondingly provided with a plurality of guide holes, the guide rods are slidably inserted into the corresponding guide holes, and the corresponding guide rods are sleeved with the springs.

According to some embodiments of the utility model, a plurality of support portions are arranged above the mounting seat along a second horizontal direction perpendicular to the first horizontal direction, and the support portions are used for supporting pipes.

According to some embodiments of the utility model, the support portion is adjustably provided up and down on the mount.

According to some embodiments of the utility model, a screw rod is vertically arranged at the bottom end of the supporting part, the mounting seat is correspondingly provided with a yielding hole, the screw rod penetrates through the yielding hole, and locking nuts are respectively in threaded connection with the screw rod above and below the mounting seat.

According to some embodiments of the present invention, a plurality of support rods are vertically arranged at the bottom end of the support portion, and the mounting seat is correspondingly provided with mounting holes through which the support rods are slidably inserted.

According to some embodiments of the utility model, the two clamping parts are provided with a C-shaped clamping groove on one side close to each other, an openable clamping space is formed between the two C-shaped clamping grooves, and the clamping space is used for clamping pipes with different pipe diameters.

According to some embodiments of the utility model, the mounting base is provided with a mounting frame, the driving mechanism comprises a lift cylinder vertically arranged at the top end of the mounting frame, and the moving part is arranged at the bottom end of the lift cylinder.

According to some embodiments of the utility model, the top end of the support part is provided with a C-shaped support groove adapted to the tube.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is another perspective view of the present invention;

FIG. 3 is a partial schematic view of the present invention;

reference numerals:

the mounting structure comprises a mounting seat 100, a mounting part 101, a spring 102, a guide rod 103, a supporting part 104, a screw 105, a lock nut 106, a support rod 107, a mounting rack 108 and a guide rail 109; a sliding part 200, a clamping part 201, an inclined surface 202 and a guide hole 203; a moving unit 300 and a control unit 301; a drive mechanism 400.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", and the like, indicate orientations and positional relationships based on the orientations and positional relationships shown in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "plurality" means two or more and "plural groups" means two or more groups unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

A clamping tool for pipe machining according to an embodiment of the present invention is described below with reference to fig. 1 to 3.

According to the pipe machining clamping tool provided by the embodiment of the utility model, as shown in fig. 1 to 3, the clamping tool comprises:

a mounting base 100;

two sliding parts 200 which are slidably mounted on the mounting base 100 in a direction of approaching or separating from each other, wherein a clamping part 201 is arranged at one end of the two sliding parts 200 which are close to each other, and an inclined surface 202 is arranged at one end of the two sliding parts 200 which are far away from each other;

a moving part 300 movably arranged on the mounting seat 100, wherein the moving part 300 is provided with two control parts 301 corresponding to the inclined surfaces 202, and the two control parts 301 can abut against the corresponding inclined surfaces 202 to push the two sliding parts 200 to synchronously slide along the mutually approaching direction in the moving process of the moving part 300;

the driving mechanism 400 is disposed on the mounting base 100 and is in transmission connection with the moving part 300, so as to control the moving part 300 to move.

In this embodiment, the mounting base 100 may be installed on a machine tool for cutting, punching or flanging a port of a pipe, when the pipe needs to be clamped during processing, the pipe is placed between the two clamping portions 201, and then the driving mechanism 400 is started, the driving mechanism 400 can control the moving portion 300 to move towards a set direction, the moving portion 300 thereby drives the two control portions 301 to abut against the inclined surfaces 202 on the corresponding sliding portions 200, when the driving mechanism 400 controls the moving portion 300 to continue moving towards the set direction, the two control portions 301 can push the two sliding portions 200 to synchronously slide along directions close to each other, the clamping portions 201 on the two sliding portions 200 can be close to each other, and the pipe is clamped. After the pipe is machined, the driving mechanism 400 controls the moving part 300 to move in the direction opposite to the set direction, so that the clamping part 201 can release the clamping of the pipe, and finally the machined pipe is taken down. According to the clamping tool for processing the pipe, the structure is simple, when the pipe needs to be clamped, the pipe only needs to be placed between the two clamping parts 201, and then the driving mechanism 400 is started, so that the clamping tool is convenient to operate, and time and labor are saved.

It should be noted that the mounting base 100 needs to be installed at a suitable position on a machine tool for performing cutting, punching or port flanging on the pipe, so that after the pipe is clamped by the two clamping portions 201, the machine tool can perform cutting, punching or port flanging on the pipe conveniently. There are various ways in which the sliding portion 200 is slidably attached to the mount 100, and for example, the mount 100 may be provided with the guide rail 109, and the sliding portion 200 may be slidably attached to the guide rail 109, or the mount 100 may be provided with a slide groove, and the sliding portion 200 may be provided with a slider and slidably attached to the slide groove via the slider. When the driving mechanism 400 controls the moving part 300 to move continuously after the control part 301 abuts against the corresponding inclined surface 202, the control part 301 applies a force to the inclined surface 202, the force decomposes a component force in the sliding direction of the sliding part 200, and the component force pushes the two sliding parts 200 to slide in the direction of approaching each other, so that the two clamping parts 201 clamp the pipe material.

In some embodiments of the present invention, as shown in fig. 1 to 3, two sliding portions 200 are slidably mounted on the upper end of the mounting seat 100 along a first horizontal direction, two inclined surfaces 202 extend obliquely downward in a direction away from each other, the moving portion 300 is disposed on the mounting seat 100 so as to be capable of moving up and down, and two control portions 301 are disposed at the bottom end of the moving portion 300 and above the corresponding inclined surfaces 202. Correspondingly, the driving mechanism 400 controls the moving part 300 to move up and down, when the pipe needs to be clamped, the pipe is placed between the two clamping parts 201, then the driving mechanism 400 controls the moving part 300 to move down, the moving part 300 can drive the control part 301 to move down and abut against the corresponding inclined surface 202, and when the control part 301 continues to move down, the two sliding parts 200 can be pushed to slide towards the direction close to each other, so that the two clamping parts 201 clamp the pipe.

The moving portion 300 may move in another direction, for example, the two inclined surfaces 202 may extend obliquely toward the same side in the first horizontal direction in a direction away from each other, and in this case, the moving portion 300 may move in a second horizontal direction perpendicular to the first horizontal direction so that the control portion 301 abuts against the corresponding inclined surface 202. It is understood that the control portion 301 is located above the corresponding inclined surface 202, which means that the control portion 301 is located above the corresponding inclined surface 202 when not abutting against the corresponding inclined surface 202.

In some embodiments of the present invention, as shown in fig. 1, the control portion 301 has a cylindrical structure, and the axial direction of the control portion 301 extends in a second horizontal direction perpendicular to the first horizontal direction, and during the downward movement of the moving portion 300, the outer side wall of the control portion 301 abuts against the corresponding inclined surface 202. The control part 301 is a cylindrical structure, and the outer side wall of the control part is abutted to the inclined surface 202, and when the control part 301 moves downwards, the friction force between the outer side wall of the control part 301 and the inclined surface 202 is small, so that the control part 301 moves more smoothly, the phenomenon of stress concentration cannot occur, and the situation that the control part 301 and the inclined surface 202 of the sliding part 200 are damaged can be reduced. The first horizontal direction and the second horizontal direction do not refer to a specific horizontal direction, but are both horizontal and perpendicular to each other to define the sliding direction of the sliding portion 200 and the axial direction of the control portion 301.

In some embodiments of the present invention, as shown in fig. 1, the control portion 301 is rotatably mounted on the moving portion 300 around its axis. Specifically, the moving portion 300 may be provided with an installation shaft along a second horizontal direction perpendicular to the first horizontal direction, and the control portion 301 may be coaxially provided with a sleeve hole and rotatably sleeved on the installation shaft through the sleeve hole. In this embodiment, the control portion 301 can rotate around its axis, and when the control portion 301 slides relative to the inclined surface 202, the friction force between the control portion 301 and the inclined surface 202 is rolling friction force, so that the control portion 301 moves more smoothly.

In some embodiments of the present invention, as shown in fig. 1 and 3, the mounting seat 100 is provided with a mounting portion 101 between two sliding portions 200, and an elastic restoring member is provided between the mounting portion 101 and the sliding portions 200, and the elastic restoring member is used for keeping the two sliding portions 200 away from each other. When needs press from both sides tight tubular product, control portion 301 promotes two sliding part 200 and slides towards the direction that is close to each other, elasticity resets the piece compression and produces the elastic restoring force, after tubular product processing is accomplished, removal portion 300 drives control portion 301 and rises and separate with inclined plane 202, sliding part 200 can slide towards the direction of keeping away from each other under the effect of the elastic restoring force that elasticity resets, thereby make clamping part 201 remove the centre gripping to tubular product, and do not need artifical sliding part 200, it is more convenient to operate, more time saving and labor saving.

In some embodiments of the present invention, as shown in fig. 1 and 3, the elastic restoring member includes a plurality of springs 102 disposed between the mounting part 101 and the sliding part 200, the springs 102 extending in the first horizontal direction. When the tube is machined, the sliding portion 200 can move away from each other under the elastic restoring force of the spring 102, so that the clamping portion 201 releases the clamping of the tube. The spring 102 is economical, wide in source, high in structural strength and long in service life. Of course, the elastic restoring member may have another structure, for example, an elastic rubber provided between the mounting portion 101 and the sliding portion 200.

In some embodiments of the present invention, as shown in fig. 1 and 3, the end surface of the mounting portion 101 close to the sliding portion 200 is provided with a plurality of guide rods 103, the guide rods 103 extend along the first horizontal direction, the sliding portion 200 is correspondingly provided with a plurality of guide holes 203, the guide rods 103 are slidably inserted into the corresponding guide holes 203, and the spring 102 is sleeved on the guide rods 103. The guide rod 103 is arranged to enable the spring 102 to stretch and contract only along the axial direction, so that the phenomenon that the spring 102 bends along the radial direction in the contraction process to reduce the elastic restoring force and even damage the spring can be avoided.

In some embodiments of the present invention, as shown in fig. 1 and 2, a plurality of supporting portions 104 are disposed above the mounting seat 100 along a second horizontal direction perpendicular to the first horizontal direction, and the supporting portions 104 are used for supporting the pipes. Tubular product presss from both sides tightly through two clamping part 201, and is different when tubular product in the length outside clamping part 201 both ends, and the upset appears because the atress is uneven in tubular product easily, and then influences the processing of tubular product. In this embodiment, the mounting base 100 is provided with a plurality of supporting portions 104 along the second horizontal direction perpendicular to the first horizontal direction, and the pipe can be supported on a plurality of supporting portions 104, so that the pipe can be prevented from being overturned due to uneven stress, and the pipe can be processed more conveniently.

In some embodiments of the present invention, as shown in fig. 1, the supporting portion 104 is adjustably disposed on the mounting base 100. Because clamping part 201 is the fixed position of centre gripping tubular product generally, for example the middle part position of tubular product both sides, and then when the pipe diameter of tubular product is different, the height of tubular product bottom is same different, if the supporting part 104 height is unchangeable, and then inconvenient tubular product to the pipe diameter difference supports. In this embodiment, the supporting portion 104 can be adjusted from top to bottom, and then can support the tubular product of different pipe diameter sizes, and the practicality is good.

In some embodiments of the present invention, as shown in fig. 1, a screw 105 is vertically disposed at a bottom end of the supporting portion 104, a yielding hole is correspondingly disposed on the mounting seat 100, the screw 105 penetrates through the yielding hole, and the screw 105 is threadedly connected to a locking nut 106 above and below the mounting seat 100. The screw 105 is moved up and down to enable different positions of the screw 105 to be located in the yielding holes, then the locking nut 106 is rotated to enable the locking nut 106 to tightly press the upper end and the lower end of the mounting base 100, and the supporting portion 104 can be adjusted up and down. Of course, the support portion 104 can be adjusted up and down by other means, for example, an air cylinder or an oil cylinder can be vertically disposed on the mounting base 100, the support portion 104 is disposed on the top end of the air cylinder or the oil cylinder, and the air cylinder or the oil cylinder is activated, that is, the up and down adjustment of the support portion 104 can be controlled.

In some embodiments of the present invention, as shown in fig. 1, a plurality of support rods 107 are vertically disposed at the bottom end of the support portion 104, and the mounting seat 100 is correspondingly provided with mounting holes, through which the support rods 107 are slidably disposed. If the supporting portion 104 is supported only by the screw 105, when the supporting portion 104 supports the tube, the tube is prone to rollover due to uneven stress, which not only affects the support of the tube, but also easily damages the supporting portion 104 and the screw 105. In this embodiment, the bottom end of the supporting portion 104 is provided with a plurality of supporting rods 107, and the supporting rods 107 are slidably inserted into the mounting holes, so as to avoid the situation that the supporting portion 104 turns on one's side.

In some embodiments of the present invention, as shown in fig. 1 and fig. 3, C-shaped clamping grooves are disposed on both sides of the two clamping portions 201 close to each other, and an openable clamping space is formed between the two C-shaped clamping grooves, and the clamping space is used for clamping pipes with different pipe diameters. Clamping part 201 sets up C shape and presss from both sides the groove, and is comparatively firm not only to the tubular product centre gripping, can the centre gripping tubular product of different pipe diameters moreover, and the practicality is better.

In some embodiments of the present invention, as shown in fig. 1 and 2, the mounting base 100 is provided with a mounting bracket 108, the driving mechanism 400 includes a lift cylinder vertically disposed at a top end of the mounting bracket 108, and the moving portion 300 is disposed at a bottom end of the lift cylinder. Specifically, the moving part 300 is arranged at the bottom end of a piston rod of the lifting oil cylinder, the lifting oil cylinder is started, the lifting oil cylinder can control the piston rod to slide up and down, and the piston rod controls the moving part 300 to move up and down, so that the operation is convenient, and time and labor are saved. Of course, the driving mechanism 400 may have another structure, for example, an air cylinder vertically disposed at the top end of the mounting frame 108, the moving portion 300 disposed at the bottom end of the air cylinder, and the moving portion 300 may be controlled to move up and down by a motor screw mechanism.

In some embodiments of the present invention, as shown in fig. 1, the top end of the supporting portion 104 is provided with a C-shaped supporting groove adapted to the tube. And then can reduce the condition that the tubular product from the border landing of supporting part 104 top to make supporting part 104 support the support of tubular product more firm.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the utility model have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the utility model, the scope of which is defined by the claims and their equivalents.

Claims

1. The utility model provides a centre gripping frock is used in tubular product processing which characterized in that includes:

a mounting base (100);

the two sliding parts (200) can be installed on the installation seat (100) in a sliding mode along the direction of approaching or separating from each other, a clamping part (201) is arranged at one end, close to each other, of each sliding part (200), and an inclined surface (202) is arranged at one end, away from each other, of each sliding part (200);

a moving part (300) which is movably arranged on the mounting seat (100), wherein the moving part (300) is provided with two control parts (301) corresponding to the inclined surfaces (202), and the two control parts (301) can abut against the corresponding inclined surfaces (202) to push the two sliding parts (200) to synchronously slide along the mutually approaching directions in the moving process of the moving part (300);

the driving mechanism (400) is arranged on the mounting seat (100) and is in transmission connection with the moving part (300) so as to control the moving part (300) to move.

2. The clamping tool for pipe machining according to claim 1, wherein the two sliding portions (200) are slidably mounted on the upper end of the mounting base (100) in a first horizontal direction, the two inclined surfaces (202) extend obliquely downward in a direction away from each other, the moving portion (300) is provided on the mounting base (100) so as to be movable up and down, and the two control portions (301) are provided at the bottom end of the moving portion (300) and are located above the corresponding inclined surfaces (202).

3. The clamping tool for pipe machining according to claim 2, wherein the control portion (301) is cylindrical, an axial direction of the control portion (301) extends in a second horizontal direction perpendicular to the first horizontal direction, and an outer side wall of the control portion (301) abuts against the corresponding inclined surface (202) during downward movement of the moving portion (300).

4. The clamping tool for pipe machining according to claim 3, wherein the control portion (301) is rotatably mounted on the moving portion (300) around its axis.

5. The clamping tool for pipe machining according to any one of claims 2 to 4, wherein an installation part (101) is arranged between the two sliding parts (200) of the installation seat (100), and an elastic resetting piece is arranged between the installation part (101) and the sliding parts (200) and used for keeping the two sliding parts (200) in a state of being away from each other.

6. The clamping tool for pipe machining according to claim 5, wherein the elastic reset piece comprises a plurality of springs (102) arranged between the mounting portion (101) and the sliding portion (200), and the springs (102) extend in the first horizontal direction.

7. The clamping tool for pipe machining according to claim 6, wherein a plurality of guide rods (103) are arranged on the end face, close to the sliding portion (200), of the mounting portion (101), the guide rods (103) extend in the first horizontal direction, a plurality of guide holes (203) are correspondingly formed in the sliding portion (200), the guide rods (103) are slidably inserted into the corresponding guide holes (203), and the corresponding guide rods (103) are sleeved with the springs (102).

8. The clamping tool for pipe machining according to any one of claims 2 to 4, wherein a plurality of supporting portions (104) are arranged above the mounting seat (100) along a second horizontal direction perpendicular to the first horizontal direction, and the supporting portions (104) are used for supporting a pipe.

9. The clamping tool for pipe machining according to claim 8, wherein the supporting portion (104) is arranged on the mounting seat (100) in a manner of being adjustable up and down.

10. The clamping tool for pipe machining according to claim 9, wherein a screw (105) is vertically arranged at the bottom end of the supporting portion (104), an abdicating hole is correspondingly arranged on the mounting seat (100), the screw (105) penetrates through the abdicating hole, and locking nuts (106) are respectively in threaded connection with the screw (105) above and below the mounting seat (100).