Three-axis movement adjustable floating device

Abstract

The invention discloses a three-axis movement adjustable floating device, and relates to the technical field of reduction gearbox testing. The device is applied to a reduction gearbox shell and comprises an upper pressing plate, guide columns are installed at the four corners of the bottom of the upper pressing plate, a supporting plate is fixedly connected to the bottom ends of the guide columns, a plurality of floating assemblies are installed on the side wall of the supporting plate, a mounting plate is installed at the bottom ends of the floating assemblies, and a clamping air cylinder is fixedly connected to the bottom end of the mounting plate. The clamping cylinder acts on the reduction gearbox shell; positioning assemblies are detachably installed on the four sides of the supporting plate, and the upper ends of the positioning assemblies are fixed to the side wall of the supporting plate. Through the arranged floating assembly, multi-directional floating fine adjustment in the horizontal direction and floating fine adjustment in the vertical direction can be achieved in the positioning and mounting process of the pin shafts and the pin holes, self-adaptive adjustment positioning between the pin holes and the pin shafts can be achieved conveniently, the positioning precision between the pin shafts and the pin holes is guaranteed, lossless mounting between the shell and the pin shafts is achieved, and the service life of the shell is prolonged. And the product quality is further improved.

Description

Technical Field

[0001] The invention relates to the technical field of reduction gearbox testing, in particular to a three-axis motion adjustable floating device. Background Art

[0002] In the automobile gearbox test line factory, it is necessary to measure the shaft system of the automobile reduction gearbox rear housing (referred to as "rear cover"), in which the locating pin needs to be installed in the locating pin hole of the rear housing. In the prior art, a clamping cylinder is often used to clamp the rear housing, lift the rear housing, and then install it with the pin shaft. However, in the docking installation of the locating pin and the locating pin hole of the rear housing, the existing equipment has poor positioning accuracy between the pin shaft and the pin hole due to the influence of the equipment's own accuracy, resulting in an offset between the pin shaft and the pin hole. This is prone to errors during the installation process, resulting in product damage. For this reason, we propose a three-axis motion adjustable floating device. Summary of the invention

[0003] The object of the present invention is to provide a three-axis motion adjustable floating device to solve the problems raised in the above background technology.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a three-axis motion adjustable floating device, applied to the reduction box housing, comprising an upper pressure plate, guide pillars are installed at the four corners of the bottom of the upper pressure plate, the bottom ends of the guide pillars are fixedly connected to a support plate, multiple groups of floating components are installed on the side wall of the support plate, and a mounting plate is installed at the bottom end of the floating component, and a clamping cylinder is fixedly connected to the bottom end of the mounting plate, and the clamping cylinder acts on the reduction box housing;

[0005] The four sides of the support plate are detachably mounted with positioning components, the upper end of the positioning components is fixed to the side wall of the support plate, and the lower end abuts against the side wall of the mounting plate, for positioning the mounting plate;

[0006] A plurality of pull rods are fixedly mounted on the top of the upper pressure plate, the bottom ends of the pull rods are fixedly connected to a cross bar, both ends of the cross bar are connected to tension springs, and the bottom ends of the tension springs are connected to the mounting plate.

[0007] Furthermore, the top end and the bottom end of the guide column are respectively fixed to the upper pressing plate and the support plate through nuts.

[0008] Furthermore, the support plate is configured as a rectangular ring as a whole, the number of floating assemblies is four, and the four groups of floating assemblies are installed on the support plate in a rectangular shape.

[0009] Furthermore, the floating assembly includes a bearing column that passes through the support plate and the mounting plate, and the outer surface of the bearing column is sleeved with a one-way thrust ball bearing 1 and a one-way thrust ball bearing 2, the bottom end of the one-way thrust ball bearing 1 is fixed on the support plate, and the top end is fixedly connected to a limiting sleeve, and the bearing column passes through the one-way thrust ball bearing 1, the one-way thrust ball bearing 2 and the limiting sleeve;

[0010] The top of the second one-way thrust ball bearing is fixed under the support plate, and a disc spring is coaxially installed at the bottom of the second one-way thrust ball bearing. The disc spring is sleeved on the outer surface of the bearing column and the bottom of the disc spring is fixed on the mounting plate.

[0011] Furthermore, a baffle is fixedly connected to the bottom of the bearing column, the diameter of the baffle is larger than the diameter of the bearing column, and the top plane of the baffle is in contact with the mounting plate.

[0012] Furthermore, the one-way thrust ball bearing 1 and the one-way thrust ball bearing 2 both include an upper ring, a lower ring, and a retaining frame and a steel ball installed between the upper ring and the lower ring, and the side walls of the upper ring and the lower ring of the one-way thrust ball bearing 1 are both provided with arc grooves adapted to the steel balls, and the lower ring of the one-way thrust ball bearing 2 is provided with an arc groove adapted to the steel balls, and the upper ring is configured as a flat plate to be rollingly connected to the steel balls;

[0013] The inner ring diameters of the upper ring, lower ring, retainer and upper ring of the one-way thrust ball bearing are all larger than the diameter of the bearing column, so as to form a gap;

[0014] The disc spring and the second retainer of the one-way thrust ball bearing, the lower ring diameter and the bearing column diameter are equal.

[0015] Furthermore, the inner ring diameter of the limiting sleeve is also larger than the diameter of the bearing column, and there is a distance between the top of the inner wall of the limiting sleeve and the top plane of the bearing column.

[0016] Furthermore, the number of the positioning components is set to eight, and two groups of positioning components are provided on each side of the support plate. The positioning components include a connecting block fixedly connected to the side wall of the support plate, a positioning rod fixedly connected to the bottom of the connecting block, a cavity is opened inside the positioning rod, and an elastic part is connected to the inner wall of the cavity, a positioning bead is connected to the other end of the elastic part, and the positioning bead and the cavity are adapted to each other.

[0017] Furthermore, the number of the pull rods is set to four, and the four pull rods are all arranged through the upper pressing plate.

[0018] Furthermore, a fixing seat is fixedly connected to the top of the mounting plate, and the lower end of the tension spring is fixedly connected to the mounting plate through the fixing seat;

[0019] A through hole for the tension spring to pass through is provided on the side wall of the support plate, and the diameter of the through hole is larger than the diameter of the tension spring.

[0020] The present invention has at least the following beneficial effects:

[0021] 1. The present invention provides a floating component that can realize multi-directional floating fine-tuning in the horizontal direction and floating fine-tuning in the vertical direction during the positioning and installation process of the pin shaft and the pin hole, so as to facilitate adaptive adjustment and positioning between the pin hole and the pin shaft, ensure the positioning accuracy between the pin shaft and the pin hole, realize lossless installation between the housing and the pin shaft, and further improve the quality of the product.

[0022] 2. The positioning assembly provided in the present invention can limit the mounting plate during horizontal floating, thereby preventing the mounting plate from excessively moving and affecting the normal alignment operation of the pin shaft and the pin hole.

[0023] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a three-dimensional schematic diagram of the overall structure of the present invention;

[0025] Figure 2 It is a side view schematic diagram of the overall structure of the present invention;

[0026] Figure 3 It is a top view schematic diagram of the overall structure of the present invention;

[0027] Figure 4 For the present invention Figure 3 Schematic diagram of the cross section of the structure at AA;

[0028] Figure 5 For the present invention Figure 4 A magnified view of the structure at B in the middle;

[0029] Figure 6 It is a cross-sectional schematic diagram of the positioning component of the present invention.

[0030] Reference numerals:

[0031] 1. Upper pressure plate; 2. Guide column; 3. Support plate; 4. Floating assembly; 41. Bearing column; 42. One-way thrust ball bearing 1; 43. One-way thrust ball bearing 2; 44. Limit sleeve; 45. Disc spring; 5. Mounting plate; 6. Clamping cylinder; 7. Positioning assembly; 71. Connecting block; 72. Positioning rod; 73. Cavity; 74. Elastic part; 75. Positioning bead; 8. Pull rod; 9. Cross bar; 10. Tension spring; 11. Fixed seat. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0033] See also Figure 1-Figure 6 The present invention provides a technical solution: a three-axis motion adjustable floating device, applied to the reduction box housing, comprising an upper pressing plate 1, guide pillars 2 are installed at the four corners of the bottom of the upper pressing plate 1, the bottom ends of the guide pillars 2 are fixedly connected to a support plate 3, a plurality of floating components 4 are installed on the side wall of the support plate 3, and a mounting plate 5 is installed at the bottom end of the floating component 4, a clamping cylinder 6 is fixedly connected to the bottom end of the mounting plate 5, and the clamping cylinder 6 acts on the reduction box housing;

[0034] The four sides of the support plate 3 are detachably mounted with positioning components 7, the upper end of the positioning components 7 is fixed to the side wall of the support plate 3, and the lower end abuts against the side wall of the mounting plate 5, for positioning the mounting plate 5;

[0035] A plurality of pull rods 8 are fixedly mounted on the top of the upper pressure plate 1 , and a cross bar 9 is fixedly connected to the bottom end of the pull rod 8 . Both ends of the cross bar 9 are connected to tension springs 10 , and the bottom end of the tension spring 10 is connected to the mounting plate 5 .

[0036] According to the technical solution of this embodiment, the top and bottom ends of the guide column 2 are respectively fixed to the upper pressure plate 1 and the support plate 3 by nuts. The set guide column 2 is used to provide support for the upper pressure plate 1 and the support plate 3, and the outer surface of the guide column 2 is set as an external thread. The installation and fixation can be achieved by installing the nut on the external thread, and it is also convenient for disassembly and maintenance.

[0037] Furthermore, a connection plate is installed at the top center of the upper pressing plate 1, which is mainly used to connect with external equipment for measurement operations. This belongs to the prior art and will not be described in detail here.

[0038] According to the technical solution of this embodiment, the support plate 3 is configured as a rectangular ring as a whole, the number of floating components 4 is four groups, and the four groups of floating components 4 are installed in a rectangular shape on the support plate 3. By utilizing the set floating components 4, the mounting plate 5 and the clamping cylinder 6 can achieve horizontal and vertical floating fine-tuning, which is convenient for better alignment of the pin hole on the reducer housing with the external pin shaft during shaft system measurement, so that the pin hole can be inserted into the pin shaft to achieve position fixation.

[0039] Furthermore, the floating assembly 4 includes a bearing column 41 that passes through the support plate 3 and the mounting plate 5. The outer surface of the bearing column 41 is sleeved with a one-way thrust ball bearing 1 42 and a one-way thrust ball bearing 2 43. The bottom end of the one-way thrust ball bearing 1 42 is fixed on the support plate 3, and the top end is fixedly connected to a limiting sleeve 44. The limiting sleeve 44 is mainly used to limit the bearing column 41 to prevent it from excessively sliding upwards, and the bearing column 41 passes through the one-way thrust ball bearing 1 42, the one-way thrust ball bearing 2 43 and the limiting sleeve 44.

[0040] The top of the one-way thrust ball bearing 43 is fixed under the support plate 3, and a disc spring 45 is coaxially installed at the bottom of the one-way thrust ball bearing 43. The disc spring 45 is sleeved on the outer surface of the bearing column 41 and the bottom of the disc spring 45 is fixed on the mounting plate 5. The disc spring 45 is mainly used to control the floating between the mounting plate 5 and the support plate 3 in the vertical direction.

[0041] It should be noted that a baffle is fixedly connected to the bottom of the bearing column 41, the diameter of the baffle is larger than the diameter of the bearing column 41, and the top plane of the baffle is in contact with the mounting plate 5. The baffle can prevent the bearing column 41 from detaching from the mounting plate 5.

[0042] Furthermore, the one-way thrust ball bearing 1 42 and the one-way thrust ball bearing 2 43 both include an upper ring, a lower ring, and a retaining frame and a steel ball installed between the upper ring and the lower ring, and the side walls of the upper ring and the lower ring of the one-way thrust ball bearing 1 42 are provided with arc grooves adapted to the steel ball, and the lower ring of the one-way thrust ball bearing 2 43 is provided with an arc groove adapted to the steel ball, and the upper ring is configured as a flat plate to be connected to the steel ball for rolling, and the configured arc groove is used to facilitate the positioning of the steel ball when it rolls, and the upper ring of the one-way thrust ball bearing 2 43 is configured as a flat plate to facilitate the rolling of the steel ball, thereby achieving horizontal floating;

[0043] The inner ring diameters of the upper ring, lower ring, retainer of the one-way thrust ball bearing 1 42 and the upper ring of the one-way thrust ball bearing 2 43 are all larger than the diameter of the bearing column 41, so as to form a gap, so as to provide a movable space for the bearing column 41 when the mounting plate 5 and the clamping cylinder 6 float in the horizontal direction, so as to avoid interference. It should be noted that the size of the gap is not specifically limited in this embodiment, and can be selected according to actual needs on the basis of meeting functional requirements;

[0044] The disc spring 45 and the retaining frame and lower ring diameter of the one-way thrust ball bearing 43 are equal to the diameter of the bearing column 41, so that when the mounting frame moves horizontally, the disc spring 45, the retaining frame and lower ring of the one-way thrust ball bearing 43 can be driven to move together with the bearing column 41, so that the steel ball in the one-way thrust ball bearing 43 rolls on the upper ring, thereby realizing horizontal floating fine-tuning through the relative movement between the upper and lower rings of the one-way thrust ball bearing 43. When it is necessary to insert the pin hole of the housing into the pin shaft, if there is a deviation between the pin shaft and the pin hole in the vertical direction, when the housing is moved downward at this time, the pin shaft will squeeze the housing, so that the housing gives an upward reaction force to the mounting plate 5 and the clamping cylinder 6. At this time, the mounting plate 5 will drive the bearing column 41 to move upward and squeeze the disc spring 45. At this time, the disc spring 45 will shrink, thereby providing a certain floating fine-tuning space for the mounting plate 5 in the vertical direction, so as to avoid rigid contact between the pin hole of the reducer housing and the housing, causing damage to the housing.

[0045] Furthermore, the inner ring diameter of the limiting sleeve 44 is also larger than the diameter of the bearing column 41, and the top of the inner wall of the limiting sleeve 44 is at a distance from the top plane of the bearing column 41, so as to provide a certain activity space for the bearing column 41 when floating in the vertical direction.

[0046] According to the technical solution of this embodiment, the number of positioning components 7 is set to eight, and two groups of positioning components 7 are provided on each side of the support plate 3. The positioning components 7 include a connecting block 71 fixedly connected to the side wall of the support plate 3, and a positioning rod 72 is fixedly connected to the bottom of the connecting block 71. A cavity 73 is opened inside the positioning rod 72, and an elastic member 74 is connected to the inner wall of the cavity 73. A positioning bead 75 is connected to the other end of the elastic member 74, and the positioning bead 75 and the cavity 73 are adapted to each other. The cavity 73 is mainly used to provide a space for the positioning bead 75 to move. The elastic member 74 It is used to provide elastic potential energy to drive the positioning beads 75 to reset. When the mounting plate 5 floats in the horizontal direction (assuming it is the left and right direction), the positioning beads 75 located on the front and rear sides of the mounting plate 5 will abut against the mounting plate 5 under the action of the elastic member 74. When the mounting plate 5 floats left and right, the positioning beads 75 on the front and rear sides will slide relative to the mounting plate 5, and the positioning beads 75 on the left and right sides will be squeezed. When the positioning beads 75 are completely squeezed into the cavity 73, the positioning rod 72 will contact the side wall of the mounting plate 5 to achieve limited fixation and prevent the mounting plate 5 from excessive displacement.

[0047] According to the technical solution of this embodiment, the number of the pull rods 8 is set to four, and the four pull rods 8 are all arranged through the upper pressure plate 1 . The pull rods 8 are mainly used to provide support for the cross bar 9 and the tension spring 10 .

[0048] Furthermore, a fixing seat 11 is fixedly connected to the top of the mounting plate 5, and the lower end of the tension spring 10 is fixedly connected to the mounting plate 5 through the fixing seat 11. When the mounting plate 5 floats up and down, the tension spring 10 and the disc spring 45 cooperate with each other to provide a vertical floating force for the mounting plate 5.

[0049] A through hole for the tension spring 10 to pass through is provided on the side wall of the support plate 3 , and the diameter of the through hole is larger than the diameter of the tension spring 10 . When the mounting plate 5 floats and deviates left and right, the through hole can provide a certain activity space for the tension spring 10 .

[0050] The use principle and process of the present invention are as follows: when it is necessary to measure the shaft system of the reducer housing, the pin hole on the reducer housing needs to be inserted into the pin shaft arranged externally. First, the reducer housing is clamped and fixed by the clamping cylinder 6, and then the device as a whole and the reducer housing are moved above the pin shaft with the help of an external moving device, and the reducer housing is driven to move downward, so that the pin hole of the reducer housing can be inserted into the pin shaft. During this period, when there is a deviation in the alignment of the pin hole and the pin shaft, the pin shaft will squeeze the housing, so that the housing gives an upward reaction force to the mounting plate 5 and the clamping cylinder 6. At this time, the mounting plate 5 will drive the bearing column 41 to move upward and squeeze the disc spring 45. At this time, the disc spring 45 and the tension spring 10 will contract, thereby providing the mounting plate 5 with a vertical direction. A certain floating fine-tuning space facilitates the flexible connection between the reduction gearbox housing and the pin shaft, avoids rigid contact between the pin hole of the reduction gearbox housing and the housing, and causes damage to the housing. While floating vertically, the mounting plate 5 can also drive the bearing column 41 to perform multi-directional displacement in the horizontal direction. At this time, the disc spring 45, the retaining frame and the lower circle of the one-way thrust ball bearing 43 will move with the bearing column 41, so that the steel ball in the one-way thrust ball bearing 43 rolls in the upper circle, so that the upper and lower circles of the one-way thrust ball bearing 43 move relative to each other, and realize horizontal floating fine-tuning, so as to facilitate adaptive adjustment and positioning between the pin hole and the pin shaft, ensure the positioning accuracy between the pin shaft and the pin hole, realize lossless installation between the housing and the pin shaft, and further improve the quality of the product.

[0051] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0052] For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. When an element is referred to as being "assembled on", "installed on", "fixed on" or "set on" another element, it can be directly on the other element or there can also be a centered element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be a centered element at the same time. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are only for illustrative purposes and are not intended to be the only implementation method.

[0053] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

[0054] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

Claims

1. A three-axis adjustable floating device, applied to a reduction gearbox housing, comprising an upper pressure plate (1), characterized in that: Guide columns (2) are installed at the four corners of the bottom of the upper pressure plate (1), the bottom end of the guide column (2) is fixedly connected to a support plate (3), a plurality of floating components (4) are installed on the side wall of the support plate (3), and a mounting plate (5) is installed at the bottom end of the floating component (4), and a clamping cylinder (6) is fixedly connected to the bottom end of the mounting plate (5), and the clamping cylinder (6) acts on the reduction gearbox housing; The four sides of the support plate (3) are detachably mounted with positioning components (7), the upper end of the positioning component (7) is fixed to the side wall of the support plate (3), and the lower end abuts against the side wall of the mounting plate (5), so as to position the mounting plate (5); A plurality of pull rods (8) are fixedly mounted on the top of the upper pressure plate (1), the bottom ends of the pull rods (8) are fixedly connected to a cross bar (9), both ends of the cross bar (9) are connected to tension springs (10), and the bottom ends of the tension springs (10) are connected to the mounting plate (5).

2. A three-axis adjustable floating device according to claim 1, characterized in that: The top end and the bottom end of the guide column (2) are respectively fixed to the upper pressing plate (1) and the supporting plate (3) via nuts.

3. A three-axis adjustable floating device according to claim 2, characterized in that: The support plate (3) is configured as a rectangular ring as a whole, the number of the floating components (4) is four groups, and the four groups of floating components (4) are installed on the support plate (3) in a rectangular shape.

4. A three-axis adjustable floating device according to claim 3, characterized in that: The floating assembly (4) comprises a bearing column (41) which passes through the support plate (3) and the mounting plate (5); the outer surface of the bearing column (41) is sleeved with a one-way thrust ball bearing (42) and a one-way thrust ball bearing (43); the bottom end of the one-way thrust ball bearing (42) is fixed on the support plate (3); the top end is fixedly connected to a limiting sleeve (44); and the bearing column (41) passes through the one-way thrust ball bearing (42), the one-way thrust ball bearing (43) and the limiting sleeve (44); The top of the one-way thrust ball bearing (43) is fixed below the support plate (3), and a disc spring (45) is coaxially mounted on the bottom of the one-way thrust ball bearing (43). The disc spring (45) is sleeved on the outer surface of the bearing column (41) and the bottom of the disc spring (45) is fixed on the mounting plate (5).

5. A three-axis adjustable floating device according to claim 4, characterized in that: A baffle is fixedly connected to the bottom of the bearing column (41); the diameter of the baffle is larger than the diameter of the bearing column (41), and the top plane of the baffle is in contact with the mounting plate (5).

6. A three-axis adjustable floating device according to claim 4, characterized in that: The one-way thrust ball bearing 1 (42) and the one-way thrust ball bearing 2 (43) both include an upper ring, a lower ring, and a retaining frame and a steel ball installed between the upper ring and the lower ring. The side walls of the upper ring and the lower ring of the one-way thrust ball bearing 1 (42) are both provided with arc grooves adapted to the steel balls. The lower ring of the one-way thrust ball bearing 2 (43) is provided with an arc groove adapted to the steel balls. The upper ring is arranged in a flat plate shape and is rollingly connected to the steel balls. The inner ring diameters of the upper ring, lower ring, retainer of the one-way thrust ball bearing (42) and the upper ring of the one-way thrust ball bearing (43) are all larger than the diameter of the bearing column (41) to form a gap; The disc spring (45) and the retaining frame and lower ring of the second one-way thrust ball bearing (43) have the same diameter as the bearing column (41).

7. A three-axis adjustable floating device according to claim 6, characterized in that: The inner ring diameter of the limiting sleeve (44) is also greater than the diameter of the bearing column (41), and the top of the inner wall of the limiting sleeve (44) is at a distance from the top plane of the bearing column (41).

8. A three-axis adjustable floating device according to claim 7, characterized in that: The number of the positioning components (7) is set to eight, and two groups of positioning components (7) are arranged on each side of the support plate (3). The positioning components (7) include a connecting block (71) fixedly connected to the side wall of the support plate (3), a positioning rod (72) fixedly connected to the bottom of the connecting block (71), a cavity (73) is opened inside the positioning rod (72), and an elastic member (74) is connected to the inner wall of the cavity (73), and a positioning bead (75) is connected to the other end of the elastic member (74), and the positioning bead (75) and the cavity (73) are adapted to each other.

9. A three-axis adjustable floating device according to claim 8, characterized in that: The number of the pull rods (8) is set to four, and the four pull rods (8) are all arranged through the upper pressing plate (1).

10. A three-axis adjustable floating device according to claim 9, characterized in that: The top of the mounting plate (5) is fixedly connected with a fixing seat (11), and the lower end of the tension spring (10) is fixedly connected to the mounting plate (5) via the fixing seat (11); A through hole for the tension spring (10) to pass through is provided on the side wall of the support plate (3), and the diameter of the through hole is larger than the diameter of the tension spring (10).

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