Clamping tool for machining port of composite pipe

Abstract

The utility model discloses a clamping tool for composite pipe port machining, and relates to the technical field of composite pipe port machining devices. The utility model provides a clamping tool for machining a port of a composite pipe, which comprises a support plate provided with a first clamping cylinder; the two clamping units are arranged on the supporting plate, and the two clamping units are located on the two sides of the first clamping cylinder in the axis direction correspondingly and can move in the direction close to each other or away from each other; wherein the clamping unit comprises a connecting plate, a rotating disc, a connecting rod and a second clamping cylinder; the connecting plate is connected with the supporting plate, the rotating disc is connected with the rotating disc through a rotating shaft, one end of the connecting rod is connected with the rotating disc, the other end of the connecting rod is connected with the second clamping cylinder, and the axis of the second clamping cylinder and the axis of the first clamping cylinder are collinear; the rotating disc can rotate around the axis of the rotating shaft so that the second clamping cylinders of the two clamping units can be selectively located on the two sides, in the radial direction, of the first clamping cylinder correspondingly.

Description

Technical Field

[0001] The present application relates to the technical field of composite pipe port processing devices, and in particular to a clamping tool for composite pipe port processing. Background Art

[0002] Pressure-bearing composite pipes are a new type of pipes with high strength and excellent anti-corrosion performance. They are mainly composed of three parts: an outer plastic layer, a reinforcement layer, and an inner plastic layer. The outer plastic layer is generally made of PE / PP / PVC material, which provides excellent anti-corrosion performance; the reinforcement layer is generally a steel wire skeleton layer, a metal steel belt layer, a fiber braided layer, etc., which strengthens the overall strength of the pipe and ensures the pressure-bearing capacity; the inner plastic layer is generally made of PE / PP / PVC material to ensure the hygiene of the conveyed fluid and prevent the internal fluid from corroding the reinforcement layer. When connecting the ports of two composite pipes, if the ports of the two composite pipes are directly connected through a connecting sleeve, the ports of the composite pipes cannot be completely formed as a whole, resulting in the internal fluid penetrating between the outer plastic layer, the reinforcement layer, and the inner plastic layer after the connection, causing the composite pipe to bulge and rupture, thereby seriously affecting the quality of the pipe. Therefore, it is usually necessary to process the ends of the composite pipes before connecting them through the connecting sleeve. In the prior art, multiple clamping is usually required, which has the problem of high labor intensity and time waste caused by downtime clamping, resulting in low work efficiency. Utility Model Content

[0003] The main purpose of the present application is to provide a clamping tool for composite pipe port processing, aiming to solve the technical problems in the prior art that multiple clamping is usually required, the manual labor intensity is high, and the time is wasted due to downtime for clamping, resulting in low work efficiency.

[0004] To achieve the above-mentioned purpose, the present application provides a clamping tool for composite pipe port processing, comprising: a support plate, on which a first clamping cylinder is arranged; a clamping unit, two of the clamping units are arranged on the support plate, and the two clamping units are respectively located on both sides of the axis direction of the first clamping cylinder, and can move in a direction close to or away from each other; wherein, the clamping unit comprises a connecting plate, a rotating disk, a connecting rod and a second clamping cylinder; the connecting plate is connected to the support plate, and the rotating disk is connected to the rotating disk through a rotating shaft, one end of the connecting rod is connected to the rotating disk, and the other end is connected to the second clamping cylinder, and the axis of the second clamping cylinder is colinear with the axis of the first clamping cylinder; the rotating disk can rotate around the axis of the rotating shaft so that the second clamping cylinders of the two clamping units can be selectively located on both sides of the first clamping cylinder in the radial direction.

[0005] Optionally, a driving assembly is provided on the support plate, and the driving assembly includes a first motor, a screw rod, a nut and a slider; a slide groove is provided on the support plate, and the screw rod is rotatably arranged in the slide groove, the first motor is arranged on the support plate, and the output shaft of the first motor is connected to the screw rod, the screw rod includes a first section and a second section with opposite thread rotation directions, the two sliders are respectively connected to the first section and the second section through the nut, and the two sliders are respectively connected to the connecting plate.

[0006] Optionally, the inner wall of the slide groove is provided with a guide groove, and the side wall of the sliding block is provided with a guide protrusion that cooperates with the guide groove.

[0007] Optionally, the extending direction of the slide groove is parallel to the axial direction of the first clamping cylinder.

[0008] Optionally, the outer wall of the rotating disk is provided with circumferential teeth, the connecting plate is provided with a second motor, the output shaft of the second motor is sleeved with a driving wheel, and the driving wheel is meshed with the circumferential teeth.

[0009] Optionally, the side wall of the connecting plate is provided with an arc-shaped limiting groove, the center of the circle corresponding to the limiting groove is located on the axis of the rotating shaft, and the rotating disk is provided with a guide column, which is used to cooperate with the limiting groove and can move along its extension direction.

[0010] Optionally, the bottom wall of the limiting groove is also provided with a plurality of limiting holes, the guide column has a through hole extending axially therethrough, a limiting rod is provided through the through hole, the limiting rod can enter the limiting hole to form a limiting structure, a baffle is provided on one side of the limiting rod close to the limiting groove, and the limiting rod sleeve is provided with a compression spring located between the baffle and the guide column.

[0011] Optionally, the plane where the connecting plate is located is perpendicular to the axis of the first clamping cylinder, and the axis of the rotating shaft is parallel to the axis of the first clamping cylinder.

[0012] Optionally, a positioning column is provided on the rotating disk, and a positioning hole for the positioning column to pass through is opened on the connecting rod.

[0013] Optionally, both the first clamping cylinder and the second clamping cylinder are provided with a fixing unit, the fixing unit includes a plurality of fixing rods distributed in a ring shape, the side wall of the clamping cylinder is radially provided with threaded holes, the fixing rods are threadedly matched with the threaded holes, and a flexible pad is provided at the inner end of the fixing rod.

[0014] Beneficial effects that this application can achieve:

[0015] The embodiment of the present application proposes a clamping tool for processing the port of a composite pipe, wherein a first clamping cylinder is arranged on a support plate, the first clamping cylinder is used to clamp a connecting sleeve, a clamping unit is respectively arranged on both sides of the axial direction of the first clamping cylinder, the clamping unit is used to clamp the pipe to be processed, the axes of the first clamping cylinder and the second clamping cylinder can be collinear, and the two clamping cylinders can also be moved to both sides of the radial direction of the first clamping cylinder under the action of a rotating disk, so as to realize the staggered setting of the ports of the two pipes to be processed, so as to facilitate the processing of the ports of the two pipes to be processed respectively, after the processing of the ports of the two pipes to be processed is completed, the rotating disk is driven to rotate so that the first clamping cylinder and the second clamping cylinder are collinear; when the first clamping cylinder and the second clamping cylinder are collinear, the two clamping units are moved in a direction approaching each other, so that the two pipes to be processed can be moved into the connecting sleeve, and the connecting sleeve is sleeved on the two pipes to be processed. The port orientation of the pipe to be processed can be adjusted by the rotating disk, and the processing of two ports of the pipe to be processed can be completed by one clamping, and the ports of the two pipes to be processed can be connected through the connecting sleeve without multiple clamping, thereby reducing manual labor intensity and improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the structure of the clamping tooling of an embodiment of the present application;

[0017] Figure 2 A schematic top view of a drive assembly according to an embodiment of the present application;

[0018] Figure 3 for Figure 1 A schematic diagram of the side structure of the middle connecting plate;

[0019] Figure 4 for Figure 3 Another state diagram of ;

[0020] Figure 5 for Figure 3 Structural diagram of the middle connecting plate;

[0021] Figure 6 A cross-sectional schematic diagram of a limiting rod according to an embodiment of the present application;

[0022] Figure 7 It is a schematic side view of the first clamping cylinder according to an embodiment of the present application.

[0023] In the figure: 10-support plate, 11-slide groove, 12-guide groove, 13-guide protrusion, 20-first clamping cylinder, 21-connecting sleeve, 22-pipe to be processed, 30-clamping unit, 31-connecting plate, 311-limiting groove, 312-limiting hole, 32-rotating disk, 321-rotating shaft, 33-connecting rod, 331-positioning column, 34-second clamping cylinder, 40-driving assembly, 41-first motor, 42-slider, 43-nut, 44-screw, 50-second motor, 51-driving wheel, 60-guide column, 61-limiting rod, 62-compression spring, 63-baffle, 70-fixing rod, 71-flexible pad.

[0024] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0027] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0029] Example 1

[0030] Reference Figure 1-Figure 7 The first embodiment of the present application provides a clamping tool for processing a composite pipe port, comprising: a support plate 10 and a clamping unit 30. A first clamping cylinder 20 is arranged on the support plate 10. Two clamping units 30 are arranged on the support plate 10, and the two clamping units 30 are respectively located on both sides of the axis direction of the first clamping cylinder 20, and can move in a direction close to or away from each other. The clamping unit 30 includes a connecting plate 31, a rotating disk 32, a connecting rod 33 and a second clamping cylinder 34; the connecting plate 31 is connected to the support plate 10, the rotating disk 32 is connected to the rotating disk 32 through a rotating shaft 321, one end of the connecting rod 33 is connected to the rotating disk 32, and the other end of the connecting rod 33 is connected to the second clamping cylinder 34, and the axis of the second clamping cylinder 34 is colinear with the axis of the first clamping cylinder 20; the rotating disk 32 can rotate around the axis of the rotating shaft 321, so that the second clamping cylinders 34 of the two clamping units 30 can be selectively located on both sides of the first clamping cylinder 20 in the radial direction.

[0031] In this embodiment, the first clamping tube 20 is used to fix the connecting sleeve 21, and the second clamping tube 34 is used to fix the port position of the pipe 22 to be processed. The connecting sleeve 21 is used to connect the ports of two pipes 22 to be processed. The connecting sleeve 21 can be fixed by a bolt assembly, or connected by other methods such as welding. The support plate 10 provides support for the clamping tooling. The support plate 10 can be set on a machine tool or on a ceiling. At least three screw holes can be reserved on the support plate 10, and the support plate 10 can be fixed by screws passing through the screw holes. The support plate 10 can also be provided with a lifting ear to facilitate the lifting of the support plate 10. During use, the connecting sleeve 21 is first installed on the first clamping tube 20, and then the two pipes 22 to be processed are respectively installed on the second clamping tube 34 on the clamping assembly, and the ports of the two pipes 22 to be processed are facing each other. First, by driving the rotating disk 32 to rotate, the two second clamping cylinders 34 are located on both sides of the first clamping cylinder 20 in the radial direction. At this time, the ports of the two pipes 22 to be processed are staggered, which is convenient for processing the ports of the two pipes 22 to be processed, such as edge sealing. Since the ports of the two pipes 22 to be processed are staggered, the two pipes 22 to be processed do not affect each other, and the two pipes 22 to be processed can be processed at the same time. After the ports of the pipes 22 to be processed are processed, the two second clamping cylinders 34 are driven to rotate so that the two second clamping cylinders 34 are aligned with the axis of the first clamping cylinder 20, and then the two clamping assemblies are driven to move in a direction close to each other, so that the ports of the two pipes 22 to be processed are close to the first clamping cylinder 20 along the axis direction of the first clamping cylinder 20, and the ports of the two pipes 22 to be processed can enter the connecting sleeve 21 clamped by the first clamping cylinder 20, and the state is maintained unchanged, which is convenient for processing the connecting sleeve 21, and the connection of the two processed pipes is realized through the connecting sleeve 21.

[0032] Example 2

[0033] As an optional implementation, refer to Figure 2 The present embodiment provides a specific structure for driving the clamping assembly to move, including: a driving assembly 40 is arranged on the support plate 10, and the driving assembly 40 includes a first motor 41, a screw rod 44, a nut 43 and a slider 42; a slide groove 11 is arranged on the support plate 10, and the screw rod 44 is rotatably arranged in the slide groove 11, the first motor 41 is arranged on the support plate 10, and the output shaft of the first motor 41 is connected to the screw rod 44, the screw rod 44 includes a first section and a second section with opposite thread rotation directions, and the two sliders 42 are respectively connected to the first section and the second section through the nut 43, and the two sliders 42 are respectively connected to the connecting plate 31.

[0034] Optionally, the inner wall of the slide groove 11 is provided with a guide groove 12 , and the side wall of the sliding block 42 is provided with a guide protrusion 13 that cooperates with the guide groove 12 .

[0035] Optionally, the extending direction of the slide groove 11 is parallel to the axial direction of the first clamping cylinder 20 .

[0036] In this embodiment, by setting a first motor 41, a screw rod 44, a nut 43 and a slider 42, the first motor 41 drives the screw rod 44 to rotate, and the screw rod 44 rotates to drive the slider 42 to move along the screw. The screw rod 44 is provided with a first section and a second section with opposite thread rotation directions, so that the slider 42 located on the first section and the slider 42 located on the second section move toward each other or move synchronously in opposite directions. By setting a guide protrusion 13 on the side wall of the slider 42 and setting a guide groove 12 on the inner side wall of the slide 11, the guide protrusion 13 moves along the guide groove 12, and plays a role of limiting and guiding the movement of the slider 42. The extension direction of the slide 11 is parallel to the axial direction of the first clamping cylinder 20, that is, when the clamping unit 30 moves along the slide 11, it is ensured that when the clamping unit 30 drives the pipe 22 to be processed to move, the pipe 22 to be processed can move smoothly in the connecting sleeve 21.

[0037] Example 3

[0038] As an optional implementation, refer to Figure 3 and Figure 4 This embodiment provides a specific driving structure of a rotating disk 32, including: the outer wall of the rotating disk 32 is provided with circumferential teeth, a second motor 50 is provided on the connecting plate 31, a driving wheel 51 is sleeved on the output shaft of the second motor 50, and the driving wheel 51 is meshed with the circumferential teeth.

[0039] In this embodiment, circumferential teeth are provided on the outer wall of the rotating disk 32, a second motor 50 is provided on the connecting plate 31, and a driving wheel 51 is provided on the second motor 50. The second motor 50 is used to drive the rotating disk 32 to rotate clockwise or counterclockwise through forward and reverse rotation. The rotating disk 32 in the figure is a semi-circular disk. Because the rotating disk 32 does not need to rotate too large an angle during use, the overall weight of the rotating disk 32 can be effectively reduced, and the cost can be controlled.

[0040] Example 4

[0041] As an optional implementation, refer to Figure 3-Figure 5 The present embodiment provides a specific limiting structure of a rotating disk 32 and a connecting plate 31, including: an arc-shaped limiting groove 311 is provided on the side wall of the connecting plate 31, and the center of the circle corresponding to the limiting groove 311 is located on the axis of the rotating shaft 321; a guide column 60 is provided on the rotating disk 32, and the guide column 60 is used to cooperate with the limiting groove 311 and can move along its extension direction.

[0042] Optionally, the bottom wall of the limiting groove 311 is also provided with a plurality of limiting holes 312, the guide column 60 has a through hole extending axially therethrough, a limiting rod 61 is provided in the through hole, the limiting rod 61 can enter the limiting hole 312 to form a limiting structure, a baffle 63 is provided on the side of the limiting rod 61 close to the limiting groove 311, and the limiting rod 61 is sleeved with a compression spring 62 located between the baffle 63 and the guide column 60.

[0043] In this embodiment, by providing the guide column 60 and the limiting groove 311 on the rotating disk 32 and the connecting plate 31, the rotation movement of the rotating disk 32 is limited and guided. By providing the limiting hole 312 on the bottom wall of the limiting groove 311, when the rotating disk 32 rotates until the limiting rod 61 is aligned with the limiting hole 312, the limiting rod 61 automatically enters the limiting hole 312 under the action of the compression spring 62, and the limiting rod 61 and the limiting hole 312 form a fiber structure to prevent the rotating disk 32 from continuing to rotate. In particular, three limiting holes 312 are provided on the bottom wall of the limiting groove 311. The two limiting holes 312 located on the left and right are used to lock the rotating disk 32 when it rotates to the left and right limit positions, that is, at this time, it is used to ensure that the two second clamping cylinders 34 are respectively located on the left and right sides of the radial direction of the first clamping cylinder 20; the limiting hole 312 located in the middle is the lowest position, and the limiting hole 312 located in the middle is used to limit the second clamping cylinder 34 on the rotating disk 32 to be in the middle position, that is, to ensure that the axes of the two second clamping cylinders 34 and the first clamping cylinder are collinear at this time. When the limiting rod 61 is located in the limiting hole 312, it has a limiting effect on the rotating disk 32 to ensure that when the ports of the pipe 22 to be processed are processed or the ports of the two pipes 22 to be processed are connected through the connecting sleeve 21, the rotating disk 32 is prevented from rotating at will. When the contact locking state is required, an outward pulling force is applied to the limiting rod 61 to further compress the compression spring 62, and the end of the limiting rod 61 is withdrawn from the limiting hole 312 to complete the unlocking.

[0044] Example 5

[0045] As an optional implementation, refer to Figure 1 This embodiment provides a method including: the plane where the connecting plate 31 is located is perpendicular to the axis of the first clamping cylinder 20, and the axis of the rotating shaft 321 is parallel to the axis of the first clamping cylinder 20.

[0046] Optionally, a positioning column 331 is provided on the rotating disk 32 , and a positioning hole for the positioning column 331 to pass through is opened on the connecting rod 33 .

[0047] In this embodiment, by setting the positions of the connecting plate 31 and the rotating shaft 321 , it is convenient to control the relative movement of the second clamping cylinder 34 along the axial direction or radial direction of the first clamping cylinder 20 .

[0048] Example 6

[0049] As an optional implementation, refer to Figure 7 The present embodiment provides a specific structure in which a first clamping cylinder 20 and a second clamping cylinder 34 respectively fix a connecting sleeve 21 and a pipe to be processed 22, including: the first clamping cylinder 20 and the second clamping cylinder 34 are both provided with a fixing unit, the fixing unit includes a plurality of fixing rods 70 distributed in an annular shape, the side walls of the first clamping cylinder 20 and the second clamping cylinder 34 are radially penetrated with threaded holes, the fixing rods 70 are threadedly matched with the threaded holes, and a flexible pad 71 is provided at the inner end of the fixing rod 70.

[0050] In this embodiment, all the fixing rods 70 are distributed in a circular array, that is, the central angles of adjacent fixing rods 70 are equal, so as to ensure the balance of the clamping force. Graduations can be set on the fixing rods 70 to facilitate the control of the relative position of the fixing rods 70 on the first clamping cylinder 20 or the second clamping cylinder 34, so that the center of the circle formed by the inner ends of all the fixing rods 70 is located on the axis of the first clamping cylinder 20 or the second clamping cylinder 34, thereby ensuring that the axis of the first clamping cylinder 20 is collinear with the axis of the connecting sleeve 21, and the axis of the second clamping cylinder 34 is collinear with the axis of the pipe 22 to be processed, so as to achieve the collinearity of the axis of the connecting sleeve 21 and the axis of the pipe 22 to be processed by controlling the axis of the first clamping cylinder 20 and the second clamping cylinder 34 to be collinear. The flexible pad 71 can be made of rubber material.

[0051] The above are only preferred embodiments of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A clamping tool for composite pipe port processing, characterized in that: include: A support plate, on which a first clamping cylinder is disposed; A clamping unit, wherein two clamping units are arranged on the support plate, the two clamping units are respectively located on both sides of the axis direction of the first clamping cylinder, and can move in a direction approaching or moving away from each other; Wherein, the clamping unit comprises a connecting plate, a rotating disk, a connecting rod and a second clamping cylinder; The connecting plate is connected to the supporting plate, the rotating disk is connected to the rotating disk via a rotating shaft, one end of the connecting rod is connected to the rotating disk, and the other end is connected to the second clamping cylinder, and the axis of the second clamping cylinder is collinear with the axis of the first clamping cylinder; The rotating disk can rotate around the axis of the rotating shaft, so that the second clamping cylinders of the two clamping units can be selectively located on both sides of the first clamping cylinder in the radial direction.

2. The clamping tool for composite pipe port processing according to claim 1, characterized in that: The support plate is provided with a driving assembly, and the driving assembly includes a first motor, a screw rod, a screw nut and a slider; A slide groove is provided on the support plate, the screw rod is rotatably arranged in the slide groove, the first motor is arranged on the support plate, the output shaft of the first motor is connected to the screw rod, the screw rod includes a first section and a second section with opposite thread rotation directions, the two sliders are respectively connected to the first section and the second section through a nut, and the two sliders are respectively connected to the connecting plate.

3. The clamping tool for composite pipe port processing according to claim 2, characterized in that: The inner wall of the slide groove is provided with a guide groove, and the side wall of the sliding block is provided with a guide protrusion matched with the guide groove.

4. The clamping tool for composite pipe port processing according to claim 2, characterized in that: An extending direction of the slide groove is parallel to an axial direction of the first clamping cylinder.

5. The clamping tool for composite pipe port processing according to claim 1, characterized in that: The outer wall of the rotating disk is provided with circumferential teeth, the connecting plate is provided with a second motor, the output shaft of the second motor is sleeved with a driving wheel, and the driving wheel is meshed with the circumferential teeth.

6. The clamping tool for composite pipe port processing according to claim 1, characterized in that: The side wall of the connecting plate is provided with an arc-shaped limiting groove, the center of the circle corresponding to the limiting groove is located on the axis of the rotating shaft, and the rotating disk is provided with a guide column, which is used to cooperate with the limiting groove and can move along the extension direction thereof.

7. The clamping tool for composite pipe port processing according to claim 6, characterized in that: The bottom wall of the limiting groove is also provided with a plurality of limiting holes, the guide column has a through hole extending axially therethrough, a limiting rod is provided in the through hole, the limiting rod can enter the limiting hole to form a limiting structure, a baffle is provided on one side of the limiting rod close to the limiting groove, and the limiting rod sleeve is provided with a compression spring located between the baffle and the guide column.

8. The clamping tool for composite pipe port processing according to claim 1, characterized in that: The plane where the connecting plate is located is perpendicular to the axis of the first clamping tube, and the axis of the rotating shaft is parallel to the axis of the first clamping tube.

9. The clamping tool for composite pipe port processing according to claim 1, characterized in that: The rotating disk is provided with a positioning column, and the connecting rod is provided with a positioning hole for the positioning column to pass through.

10. The clamping tool for composite pipe port processing according to claim 1, characterized in that: The first clamping cylinder and the second clamping cylinder are both provided with a fixing unit, and the fixing unit includes a plurality of fixing rods distributed in a ring shape. The side wall of the clamping cylinder is radially provided with threaded holes, and the fixing rods are threadedly matched with the threaded holes. A flexible pad is provided at the inner end of the fixing rod.

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