Bearing mounting and testing all-in-one machine for expansion winding drum

Abstract

The utility model relates to the technical field of expansion winding drum production, in particular to a bearing mounting and testing all-in-one machine of an expansion winding drum, which comprises a working plate, a plurality of supporting columns fixed at the bottom end of the working plate, slots arranged on the top surface of the working plate, and an expansion winding drum body arranged on the top surface of the working plate, and a bearing sleeved on the outer wall of the circumference of the shaft body of the expansion and shrinkage winding drum body is arranged above the working plate. According to the utility model, the two limiting mechanisms are arranged and the top surface of the working plate is provided with the slot so as to limit the expansion drum body, the installation mechanism is arranged so as to install the bearing on the circumferential outer wall of the shaft body of the expansion drum body, and the testing mechanism is arranged so as to carry out a rotation test on the installed bearing. According to the bearing testing device, the installed bearing can be tested in time, rotation testing work of the bearing is not needed to be carried out manually after installation, time and labor are saved, and the installation efficiency of the bearing can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of expansion and contraction reel production, in particular to an all-in-one machine for installing and testing bearings of an expansion and contraction reel. Background Art

[0002] The uncoiler is one of the essential and important equipment in the welded pipe production line. The uncoiler has two functions, one is to drive the steel coil to rotate, and the other is to support the expansion of the steel coil. The expansion of the uncoiler is usually achieved through an expansion and contraction reel. The expansion and contraction reel needs to be installed with bearings during the production process, and a bearing installation device is required for the bearing installation.

[0003] Nowadays, after the bearing is installed, it is necessary to perform a rotation test on the installed bearing to detect the installation effect of the bearing. Usually, the clamped expansion and contraction reel needs to be removed and manually rotated to perform the bearing inspection work. The manual inspection method is time-consuming and laborious, and the installed bearing cannot be rotated in time, which will affect the production efficiency of the expansion and contraction reel. Utility Model Content

[0004] The purpose of the utility model is to provide an all-in-one bearing installation and testing machine for an expansion and contraction reel, so as to solve the problem raised in the above-mentioned background technology that nowadays, after the bearing is installed, it is necessary to perform a rotation test on the installed bearing to detect the installation effect of the bearing. Usually, the clamped expansion and contraction reel needs to be removed and the bearing needs to be manually rotated to perform the bearing inspection work. The manual inspection method is time-consuming and labor-intensive, and the installed bearing cannot be rotated in time, which will affect the production efficiency of the expansion and contraction reel.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] The bearing installation and testing integrated machine of the expansion and contraction reel comprises a working plate, a plurality of supporting columns are fixed at the bottom end of the working plate, a slot is arranged on the top surface of the working plate, an expansion and contraction reel body whose shaft body is slidably plugged into the slot on the top surface is arranged on the top surface of the working plate, a bearing sleeved on the circumferential outer wall of the shaft body of the expansion and contraction reel body is arranged above the working plate, two mutually symmetrical limiting mechanisms for clamping the expansion and contraction reel body are arranged on the top surface of the working plate, an installation mechanism for installing the bearing is arranged on the top surface of the working plate, and further comprises:

[0007] The testing mechanism is arranged on the top surface of the working plate and is used for performing a rotation test on the installed bearing. The testing mechanism comprises two fixed plates fixed on the top surface of the working plate and symmetrical to each other, two rotating columns rotatably connected to the fixed plates on the same side, a screw rod coaxially fixed between the two rotating columns and arranged laterally, a rotating rod coaxially fixed on the surface of one of the fixed plates away from the screw rod, two gears located above the working plate and used for driving the rotating rod to rotate, a driving motor installed on the surface of one of the fixed plates away from the screw rod and used for driving the two gears to rotate, a connecting rod slidably connected to the top surface of the working plate and threadedly connected to the screw rod, a mounting plate fixed on the top surface of the connecting rod and in a T-shaped shape, a roller rotatably connected to the horizontal plate end of the mounting plate, a testing column coaxially fixed to the bottom end of the roller and used for performing a rotation test on the bearing, and a testing motor installed on the top surface of the horizontal plate end of the mounting plate and whose output shaft is coaxially connected to the roller, the circumferential outer wall of the testing column is provided with friction lines, and the two gears are meshed with each other.

[0008] As a preferred embodiment, the testing mechanism further comprises a rotating shaft coaxially connected to the output shaft of the driving motor, and the two gears are coaxially fixed on the circumferential outer walls of the rotating shaft and the rotating rod, respectively.

[0009] As a preferred embodiment, a guide groove is provided on the top surface of the working plate, and a guide block slidably connected to the guide groove on the top surface of the working plate is fixed on the bottom surface of the connecting rod.

[0010] As a preferred embodiment, the limiting mechanism includes a vertical plate fixed on the top surface of the working plate, an electric push rod with a rod body installed on the surface of one side of the vertical plate close to the expansion and contraction reel body, and a clamping ring fixed to the piston rod of the electric push rod, the outer wall of the clamping ring on the side away from the electric push rod on the same side tightly contacts the circumferential outer wall of the shaft of the expansion and contraction reel body, and the two clamping rings are spliced ​​together.

[0011] As a preferred embodiment, the mounting mechanism includes an L-shaped plate fixed on the top surface of the working plate, an electric cylinder whose cylinder body is installed on the top surface of the horizontal plate end of the L-shaped plate and whose piston rod passes through the bottom surface of the horizontal plate end of the L-shaped plate, a movable plate fixed to the piston rod of the electric cylinder through a gasket, a plurality of movable columns fixed at the bottom end of the movable plate, and a pressure block coaxially fixed to the bottom surface of the movable column on the same side, wherein the pressure block corresponds to the position of the bearing and is adapted in size.

[0012] As a preferred embodiment, the position of the test column corresponds to the position of the bearing, and the size of the test column matches the size of the bearing.

[0013] As a preferred embodiment, a support plate is fixed to the bottom end of the support column, an anti-skid plate matching its shape is fixed to the bottom end of the support plate, and the thickness of the anti-skid plate is 2-6 cm.

[0014] As a preferred embodiment, the longitudinal section of the guide groove on the top surface of the working plate is in an I-shape, and the guide block is in an I-shape that matches the shape of the guide groove on the top surface of the working plate.

[0015] As a preferred embodiment, the mounting mechanism also includes a protective tube fixed on the top surface of the horizontal plate end of the L-shaped plate, the cylinder body of the electric cylinder is located inside the protective tube, the testing mechanism also includes a protective box fixed on the surface of one of the fixed plates away from the screw rod, and a motor box fixed on the top surface of the horizontal plate end of the mounting plate, the test motor is located inside the motor box, the drive motor is located inside the protective box, and the rotating shaft passes through the outer wall of the protective box away from the screw rod.

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] 1. The utility model can limit the expansion and contraction reel body by setting two limiting mechanisms and setting a slot on the top surface of the working plate, and can install the bearing on the circumferential outer wall of the expansion and contraction reel body shaft by setting the installation mechanism, and can perform a rotation test on the installed bearing by setting the testing mechanism, so that the installed bearing can be tested in time, and there is no need to manually perform the rotation test of the bearing after installation, which saves time and labor, and can improve the installation efficiency of the bearing;

[0018] 2. In the utility model, a guide groove is provided on the top surface of the working plate, and a guide block slidably connected to the guide groove on the top surface of the working plate is fixed on the bottom surface of the connecting rod, which can guide the movement of the connecting rod and indirectly guide the movement of the test column. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0020] Figure 2 It is a schematic diagram of the overall structure of the working plate in the utility model;

[0021] Figure 3 It is a partial exploded view of the utility model;

[0022] Figure 4 It is an exploded view of the limiting mechanism in the utility model;

[0023] Figure 5 It is a schematic diagram of the overall structure of the installation mechanism in the utility model;

[0024] Figure 6 The local explosion of the installation mechanism in the utility model Figure 1 ;

[0025] Figure 7 The local explosion of the installation mechanism in the utility model Figure 2 ;

[0026] Figure 8 It is a schematic diagram of the overall structure of the testing mechanism in the utility model;

[0027] Fig. 9 The local explosion of the test mechanism in the utility model Figure 1 ;

[0028] Fig.10 The local explosion of the test mechanism in the utility model Figure 2 ;

[0029] Fig.11 The local explosion of the test mechanism in the utility model Figure 3 .

[0030] The meaning of each number in the figure is:

[0031] 1. Working plate; 2. Expansion and contraction reel body; 3. Bearing; 4. Support column; 5. Support plate; 6. Anti-skid plate; 7. Test mechanism; 71. Fixed plate; 72. Rotating column; 73. Screw; 74. Connecting rod; 75. Guide block; 76. Mounting plate; 77. Rotating roller; 78. Test column; 79. Test motor; 710. Motor box; 711. Rotating rod; 712. Gear; 713. Drive motor; 714. Rotating shaft; 715. Protection box; 8. Limiting mechanism; 81. Vertical plate; 82. Electric push rod; 83. Clamp ring; 9. Mounting mechanism; 91. L-shaped plate; 92. Electric cylinder; 93. Moving plate; 94. Gasket; 95. Protection cylinder; 96. Moving column; 97. Press block. DETAILED DESCRIPTION

[0032] 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 in 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.

[0033] See also Figure 1-Figure 11 The utility model provides a technical solution: an integrated machine for installing and testing the bearing of an expansion and contraction reel, comprising a working plate 1, a plurality of support columns 4 are fixed at the bottom end of the working plate 1, a slot is arranged on the top surface of the working plate 1, an expansion and contraction reel body 2 is arranged on the top surface of the working plate 1, and a shaft body and its top surface slot are slidably plugged into each other, a bearing 3 is arranged on the upper part of the working plate 1 and is sleeved on the circumferential outer wall of the shaft body of the expansion and contraction reel body 2, two mutually symmetrical limiting mechanisms 8 are arranged on the top surface of the working plate 1 and are used to clamp the expansion and contraction reel body 2, and an installation mechanism 9 is arranged on the top surface of the working plate 1 for installing the bearing 3, and also includes:

[0034] The testing mechanism 7 is arranged on the top surface of the working plate 1 and is used for performing a rotation test on the bearing 3 after installation. The testing mechanism 7 includes two fixed plates 71 fixed on the top surface of the working plate 1 and symmetrical to each other, two rotating columns 72 rotatably connected to the fixed plates 71 on the same side, a screw 73 coaxially fixed between the two rotating columns 72 and arranged laterally, a rotating rod 711 coaxially fixed on the surface of one of the fixed plates 71 away from the screw 73 on one side, two gears 712 located above the working plate 1 and used for driving the rotating rod 711 to rotate, a driving motor 713 installed on the surface of one of the fixed plates 71 away from the screw 73 on one side and used for driving the two gears 712 to rotate, a connecting rod 74 slidably connected to the top surface of the working plate 1 and threadedly connected to the screw 73, a T-shaped mounting plate 76 fixed on the top surface of the connecting rod 74, and a mounting plate 76 with a mounting plate 76 having a T-shaped shape. A roller 77 rotatably connected to the transverse plate end of the mounting plate 76, a test column 78 coaxially fixed to the bottom end of the roller 77 and used for performing a rotation test on the bearing 3, and a test motor 79 mounted on the top surface of the transverse plate end of the mounting plate 76 and with the output shaft coaxially connected to the roller 77, a friction pattern is provided on the circumferential outer wall of the test column 78, and two gears 712 are meshed with each other, and the expansion and contraction reel body 2 can be limited by setting two limiting mechanisms 8 and setting a slot on the top surface of the working plate 1, and the bearing 3 can be installed on the circumferential outer wall of the shaft of the expansion and contraction reel body 2 by setting the mounting mechanism 9, and the bearing 3 can be installed on the circumferential outer wall of the shaft of the expansion and contraction reel body 2 by setting the test mechanism 7, and the installed bearing 3 can be tested in time, and there is no need to manually perform a rotation test on the bearing 3 after installation, which saves time and effort and can improve the installation efficiency of the bearing 3.

[0035] In this embodiment, the testing mechanism 7 also includes a rotating shaft 714 coaxially connected to the output shaft of the driving motor 713, and two gears 712 are coaxially fixed on the circumferential outer walls of the rotating shaft 714 and the rotating rod 711, respectively, which can smoothly drive the two gears 712 to rotate, and then smoothly drive the screw 73 to rotate.

[0036] In addition, a guide groove is provided on the top surface of the working plate 1, and a guide block 75 slidably connected to the guide groove on the top surface of the working plate 1 is fixed on the bottom surface of the connecting rod 74, which can guide the movement of the connecting rod 74 and indirectly guide the movement of the test column 78.

[0037] Furthermore, the limiting mechanism 8 includes a vertical plate 81 fixed on the top surface of the working plate 1, an electric push rod 82 whose rod body is installed on the surface of one side of the vertical plate 81 close to the expansion and contraction reel body 2, and a clamping ring 83 fixed to the piston rod of the electric push rod 82. The outer wall of the clamping ring 83 on the side away from the electric push rod 82 on the same side is in close contact with the circumferential outer wall of the shaft body of the expansion and contraction reel body 2, and the two clamping rings 83 are assembled together to limit the expansion and contraction reel body 2.

[0038] Furthermore, the mounting mechanism 9 includes an L-shaped plate 91 fixed on the top surface of the working plate 1, an electric cylinder 92 whose cylinder body is mounted on the top surface of the transverse plate end of the L-shaped plate 91 and whose piston rod passes through the bottom surface of the transverse plate end of the L-shaped plate 91, a movable plate 93 fixed to the piston rod of the electric cylinder 92 through a gasket 94, a plurality of movable columns 96 fixed to the bottom end of the movable plate 93, and a pressure block 97 coaxially fixed to the bottom surface of the movable column 96 on the same side. The pressure block 97 corresponds to the position of the bearing 3 and is adapted in size, so that the bearing 3 can be installed.

[0039] Specifically, the position of the test column 78 corresponds to the position of the bearing 3 , and the size of the test column 78 matches the size of the bearing 3 , so that the test column 78 can smoothly test the bearing 3 .

[0040] More specifically, a support plate 5 is fixed to the bottom end of the support column 4, and an anti-skid plate 6 matching its shape is fixed to the bottom end of the support plate 5, and the thickness of the anti-skid plate 6 is 2-6 cm, preferably 4 cm in this article, so as to increase the contact area and friction between the entire device and the ground, thereby making the entire device more stable during operation.

[0041] It is worth noting that the longitudinal cross-sectional shape of the guide groove on the top surface of the working plate 1 is I-shaped, and the shape of the guide block 75 is I-shaped that matches the shape of the guide groove on the top surface of the working plate 1, which can make the connection between the guide block 75 and the guide groove on the top surface of the working plate 1 tighter, and indirectly make the test column 78 more stable during movement.

[0042] It is worth mentioning that the mounting mechanism 9 also includes a protective tube 95 fixed on the top surface of the transverse plate end of the L-shaped plate 91, and the cylinder body of the electric cylinder 92 is located inside the protective tube 95. The testing mechanism 7 also includes a protective box 715 fixed on the surface of one of the fixing plates 71 on the side away from the screw 73, and a motor box 710 fixed on the top surface of the transverse plate end of the mounting plate 76. The test motor 79 is located inside the motor box 710, the drive motor 713 is located inside the protective box 715, and the rotating shaft 714 passes through the outer wall of the protective box 715 on the side away from the screw 73, which can protect the electric cylinder 92, the test motor 79 and the drive motor 713, thereby extending the service life of the electric cylinder 92, the test motor 79 and the drive motor 713.

[0043] Finally, it should be noted that the test motor 79, drive motor 713, electric push rod 82, electric cylinder 92 and other components involved in the utility model are all universal standard parts or components known to technical personnel in this field, and their structures and principles are all known to technical personnel in this field through technical manuals or through conventional experimental methods. In the idle space of this device, all the above-mentioned electrical components, which refer to power elements, electrical components, and compatible controllers and power supplies, are connected through wires. The specific connection means should refer to the working principle of the utility model. The electrical connection between each electrical component is completed in a sequential working order, and the detailed connection means are all well-known technologies in the field.

[0044] In the specific use of this embodiment, when the bearing 3 needs to be installed, the shaft body of the expansion and contraction reel body 2 is first slidably plugged into the slot on the top surface of the working plate 1, and then the two electric push rods 82 are started by the external PLC. The piston rod movement of the electric push rod 82 drives the clamping ring 83 fixed thereto to move. When the outer wall of one side of the clamping ring 83 away from the electric push rod 82 on the same side is in close contact with the circumferential outer wall of the shaft body of the expansion and contraction reel body 2, the two electric push rods 82 are closed by the external PLC, and then the bearing 3 is sleeved on the circumferential outer wall of the shaft body of the expansion and contraction reel body 2, and then the external PLC is started. The piston rod of the electric cylinder 92 is controlled to perform telescopic movement. The movement of the piston rod of the electric cylinder 92 drives the movement of the moving plate 93 fixed to it through the gasket 94. The movement of the moving plate 93 drives the movement of several moving columns 96 fixed to it. The movement of the moving column 96 drives the movement of the pressing block 97 coaxially fixed to it. Because the piston rod of the electric cylinder 92 performs telescopic movement, the several pressing blocks 97 can be made to reciprocate in the vertical direction. During the movement of the several pressing blocks 97, the bearing 3 can be installed. When the several pressing blocks 97 move to a suitable position, the electric cylinder 92 is closed through the external PLC.

[0045] Then, the drive motor 713 is started by the external PLC. The output shaft of the drive motor 713 rotates to drive the rotating shaft 714 coaxially connected thereto. The rotating shaft 714 rotates to drive the coaxially fixed gear 712 on the same side to rotate. The gear 712 rotates to drive another gear 712 meshing therewith to rotate. The other gear 712 rotates to drive the rotating rod 711 coaxially fixed thereto to rotate. The rotating rod 711 rotates to drive the coaxially fixed rotating column 72 on the same side to rotate. The rotating column 72 rotates to drive the coaxially fixed screw 73 to rotate. The rotating screw 73 rotates to drive the connecting rod 74 threadedly connected thereto to move. The connecting rod 74 moves in the guide The block 75 and the guide groove on the top surface of the working plate 1 move, the connecting rod 74 moves to drive the mounting plate 76 fixed thereto to move, the mounting plate 76 moves and then indirectly drives the test column 78 to move, when the circumferential outer wall of the test column 78 is tightly fitted with the circumferential outer wall of the outer ring of the bearing 3, the drive motor 713 is turned off and the test motor 79 is started through the external PLC, the output shaft of the test motor 79 rotates to drive the roller 77 coaxially connected thereto to rotate, the rotation of the roller 77 drives the test column 78 coaxially fixed thereto to rotate, by observing the rotation of the bearing 3, the installation effect of the bearing 3 can be detected.

[0046] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the utility model and are not used to limit the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. An integrated machine for mounting and testing the bearing of an expansion and contraction reel, comprising a working plate (1), characterized in that: A plurality of support columns (4) are fixed to the bottom end of the working plate (1); a slot is provided on the top surface of the working plate (1); an expansion and contraction reel body (2) is provided on the top surface of the working plate (1) and the shaft body is slidably plugged into the slot on the top surface; a bearing (3) is provided above the working plate (1) and is sleeved on the circumferential outer wall of the shaft body of the expansion and contraction reel body (2); two mutually symmetrical limiting mechanisms (8) are provided on the top surface of the working plate (1) and are used to clamp the expansion and contraction reel body (2); a mounting mechanism (9) is provided on the top surface of the working plate (1) and is used to mount the bearing (3); and the working plate (1) further comprises: The testing mechanism (7) is arranged on the top surface of the working plate (1) and is used to perform a rotation test on the installed bearing (3). The testing mechanism (7) comprises two fixed plates (71) fixed on the top surface of the working plate (1) and symmetrical to each other, two rotating columns (72) rotatably connected to the fixed plates (71) on the same side, a screw (73) coaxially fixed between the two rotating columns (72) and arranged transversely, a rotating rod (711) coaxially fixed to the surface of one of the fixed plates (71) away from the screw (73), two gears (712) located above the working plate (1) and used to drive the rotating rod (711) to rotate, and a rotating rod (711) installed on the surface of one of the fixed plates (71) away from the screw (73) and arranged transversely. A driving motor (713) for driving the two gears (712) to rotate, a connecting rod (74) slidably connected to the top surface of the working plate (1) and threadedly connected to the screw rod (73), a mounting plate (76) fixed on the top surface of the connecting rod (74) and in a T-shape, a roller (77) rotatably connected to the transverse plate end of the mounting plate (76), a test column (78) coaxially fixed to the bottom end of the roller (77) and used for performing a rotation test on the bearing (3), and a test motor (79) mounted on the top surface of the transverse plate end of the mounting plate (76) and with an output shaft coaxially connected to the roller (77), wherein the circumferential outer wall of the test column (78) is provided with friction lines, and the two gears (712) are meshed with each other.

2. The bearing installation and testing integrated machine for the expansion and contraction reel according to claim 1, characterized in that: The testing mechanism (7) further comprises a rotating shaft (714) coaxially connected to the output shaft of the driving motor (713), and the two gears (712) are coaxially fixed on the rotating shaft (714) and the circumferential outer wall of the rotating rod (711), respectively.

3. The bearing installation and testing integrated machine for the expansion and contraction reel according to claim 1, characterized in that: A guide groove is provided on the top surface of the working plate (1), and a guide block (75) slidably connected to the guide groove on the top surface of the working plate (1) is fixed on the bottom surface of the connecting rod (74).

4. The all-in-one machine for installing and testing the bearing of the expansion and contraction reel according to claim 1, characterized in that: The limiting mechanism (8) comprises a vertical plate (81) fixed on the top surface of the working plate (1), an electric push rod (82) whose rod body is installed on the surface of one side of the vertical plate (81) close to the expansion and contraction reel body (2), and a clamping ring (83) fixed to the piston rod of the electric push rod (82), wherein the outer wall of the side of the clamping ring (83) away from the electric push rod (82) on the same side is in close contact with the circumferential outer wall of the shaft body of the expansion and contraction reel body (2), and the two clamping rings (83) are spliced ​​together.

5. The bearing installation and testing integrated machine for the expansion and contraction reel according to claim 2, characterized in that: The mounting mechanism (9) comprises an L-shaped plate (91) fixed on the top surface of the working plate (1), an electric cylinder (92) whose cylinder body is mounted on the top surface of the transverse plate end of the L-shaped plate (91) and whose piston rod passes through the bottom surface of the transverse plate end of the L-shaped plate (91), a moving plate (93) fixed to the piston rod of the electric cylinder (92) via a gasket (94), a plurality of moving columns (96) fixed to the bottom end of the moving plate (93), and a pressure block (97) coaxially fixed to the bottom surface of the moving column (96) on the same side, wherein the pressure block (97) corresponds to the position of the bearing (3) and has a size that matches the bearing (3).

6. The all-in-one machine for installing and testing the bearing of the expansion and contraction reel according to claim 1, characterized in that: The position of the test column (78) corresponds to the position of the bearing (3), and the size of the test column (78) matches the size of the bearing (3).

7. The all-in-one machine for installing and testing the bearing of the expansion and contraction reel according to claim 1, characterized in that: A support plate (5) is fixed at the bottom end of the support column (4), and an anti-skid plate (6) matching its shape is fixed at the bottom end of the support plate (5), and the thickness of the anti-skid plate (6) is 2-6 cm.

8. The all-in-one machine for installing and testing the bearing of the expansion and contraction reel according to claim 3, characterized in that: The longitudinal cross-sectional shape of the guide groove on the top surface of the working plate (1) is in the shape of an I-beam, and the shape of the guide block (75) is in the shape of an I-beam that matches the shape of the guide groove on the top surface of the working plate (1).

9. The all-in-one machine for installing and testing the bearing of the expansion and contraction reel according to claim 5, characterized in that: The mounting mechanism (9) further comprises a protective tube (95) fixed on the top surface of the transverse plate end of the L-shaped plate (91); the cylinder body of the electric cylinder (92) is located inside the protective tube (95); the testing mechanism (7) further comprises a protective box (715) fixed on the surface of one of the fixing plates (71) on the side away from the screw rod (73); and a motor box (710) fixed on the top surface of the transverse plate end of the mounting plate (76); the testing motor (79) is located inside the motor box (710); the driving motor (713) is located inside the protective box (715); and the rotating shaft (714) passes through the outer wall of the protective box (715) on the side away from the screw rod (73).

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