Grinding machine for casting manufacturing

Abstract

The grinding machine for casting manufacturing comprises a supporting frame and a supporting arm transversely erected at the upper end of the supporting frame, a supporting plate is relatively perpendicularly arranged at one end of the supporting arm, a first support parallel to the supporting arm and extending in the radial direction is arranged on the plate face of the supporting plate, and a clamping mechanism is arranged at the extending end of the first support. A supporting mechanism is arranged at the end, close to the clamping mechanism, of the supporting arm, a clamping plate is arranged on the upper end face of the supporting arm, an adjusting mechanism arranged at the upper end of the supporting arm is installed through the clamping plate, a first driving motor is installed on the face, opposite to the supporting arm, of the supporting plate in an attached mode, and a driving wheel is installed at the shaft end of the first driving motor. And an abrasive belt is arranged between the driving wheel and the adjusting mechanism and between the driving wheel and the supporting mechanism in a sleeving mode, abrasive belt replacement is more convenient, and polishing is more efficient.

Description

Technical Field

[0001] The invention relates to the technical field of equipment manufacturing equipment, in particular to a grinding machine for casting manufacturing. Background Art

[0002] Castings are shaped objects made of various metals. That is, smelted liquid metal is poured into a pre-prepared mold by pouring, injection, suction or other casting methods. After cooling, it is polished and other subsequent processing methods to obtain an object with a certain shape, size and performance. In order to ensure that the castings are safer and more beautiful during use, a grinder is usually used to grind the burrs of the castings after they are fully formed to prevent the iron chips and burrs on the castings from scratching fingers or causing installation problems due to thick iron chips and burrs.

[0003] When dealing with casting structures with different metal densities or different sizes, sanding belts or grinding heads with different mesh densities need to be used for processing. The steps for replacing the sanding belts of the grinding machine in the prior art are relatively cumbersome, which makes it troublesome to replace the sanding belts or sanding heads. For example, the Chinese invention patents with patent application numbers: CN201711331574.7 and CN201711242286.4 both use screws to fix the sanding head to the fixed base in the disclosed technical features. The steps are relatively cumbersome. For different castings, the screws need to be disassembled and reinstalled. At the same time, the frequent disassembly and reinstallation of the screws will cause the risk of screw slippage or wear, resulting in unstable fixation. Summary of the Invention

[0004] In order to solve the above problems, the present invention provides a grinding machine for casting manufacturing to solve the technical problems raised in the above background technology.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: The cam is provided with a toothed plate which is fixed to the upper end of the support frame so as to enable the cam to move relative to the toothed plate and to move relative to the toothed plate, and a toothed plate is provided on the upper end of the support frame so as to prevent the cam from moving relative to the toothed plate.

[0006] Furthermore, the support mechanism includes a positioning plate, a connecting plate 1 is provided in the middle of the rear end of the positioning plate, an arc-shaped sliding hole is opened on the surface of the connecting plate 1, and the connecting plate 1 is connected and fixed with the support arm bolts through the arc-shaped sliding hole.

[0007] Furthermore, connecting plate 2 and connecting plate 3 are respectively protruded from the upper and lower ends of the front end surface of the positioning plate, and connecting plate 2 and connecting plate 3 are respectively rotatably installed with transmission wheel 1 and transmission wheel 2. Connecting plate 4 and connecting plate 5 are also relatively vertically arranged from top to bottom on the positioning plate, and heat dissipation fan fins are rotatably installed on connecting plate 4 and connecting plate 5. A transmission belt 1 is provided between the heat dissipation fan fins installed on connecting plate 4 and transmission wheel 1, and a transmission belt 2 is provided between the heat dissipation fan fins installed on connecting plate 5 and the transmission wheel 2 bracket.

[0008] Furthermore, the adjustment mechanism includes an adjustment plate, one end of which is rotatably mounted on the middle of the clamping plate, and the other end of the adjustment plate is laterally mounted with a rotatable transmission wheel three.

[0009] Furthermore, a positioning seat 1 is rotatably installed in the middle of the adjustment plate, and a positioning seat 2 is rotatably installed in the middle of the support arm. The positioning seat 1 and the positioning seat 2 are arranged on the same side, and a hydraulic rod is arranged between the positioning seat 1 and the positioning seat 2.

[0010] Furthermore, the clamping mechanism includes a driving motor 2 fixedly arranged at one end of the bracket, the upper end of the driving shaft of the driving motor 2 is fixedly connected to a slideway 1, the upper end of the slideway 1 is open and the inside is hollow, a slider 1 is slidingly arranged in the slideway 1, and a rotating plate is fixedly arranged on the upper end of the slider 1, and an annular groove is opened on the upper end surface of the rotating plate.

[0011] Furthermore, a mounting hole 1 is opened at one end of the slider, and a mounting hole 2 is opened on the end surface of the slideway 1 close to the mounting hole 1. A screw extending into the interior of the slideway 1 is threadedly connected through the mounting hole 2, and the end of the screw is threadedly connected to the interior of the mounting hole 1.

[0012] Furthermore, a slideway 2 is provided on one side of the slideway 1, and a slider 2 is slidably provided in the slideway 2. A pull rod is provided on the lower end surface of the end of the slider 2 close to the slideway 1, and the pull rod extends in the annular groove on the upper end of the rotating plate. A support plate is provided on the upper end of the slider 2, and a positioning device is provided on the support plate.

[0013] Furthermore, the positioning device includes a fixing plate 1 and a fixing plate 2, the lower end of the fixing plate is fixedly set on the upper surface of the support plate, and the fixing plate 1 and the fixing plate 2 are both provided with corresponding threaded holes. The fixing plate 1 and the fixing plate 2 are connected by bolts and locked in the threaded holes of the fixing plate 1 and the fixing plate 2.

[0014] The beneficial effects of the present invention are: by arranging an adjustment mechanism on the support arm, the adjustment plate can be swingably arranged in the clamping plate, and at the same time a hydraulic rod is provided between the adjustment plate and the support arm, the hydraulic rod continuously supports the support arm upward to ensure that the support arm is supported upward, so that the sanding belt sleeved between the driving wheel, the transmission wheel one, the transmission wheel two and the transmission wheel three remains tight, while improving its grinding efficiency and ensuring the stability of the sanding belt when it is sleeved, and when replacing sanding belts of different mesh counts, it is only necessary to press the support arm downward to loosen the tight sanding belt and take it out. Even when replacing sanding belts of different sizes and lengths, since the support arm can be pressed downward and maintains the upward supporting force in a natural state, it can adapt to the assembly of more sanding belts of different lengths.

[0015] By arranging connecting plate four and connecting plate five on the positioning plate, heat dissipation fan fins are rotatably installed on connecting plate four and connecting plate five respectively, a transmission belt one is provided between the heat dissipation fan fins installed on connecting plate four and transmission wheel one, and a transmission belt two is provided between the heat dissipation fan fins installed on connecting plate five and transmission wheel two bracket. During the rotation of transmission wheel one and transmission wheel two, the heat dissipation fan fins can be driven to rotate at the same time and the sanding belt in the continuous action state can be blown to cool down, thereby reducing the heat generated by the sanding belt that is in continuous contact with the casting, thereby improving the service life of the sanding belt.

[0016] By setting up a clamping mechanism, the clamping mechanism has a slideway 1 and a slider 1. By twisting the screw, the position of the slider 1 in the slideway is changed, thereby changing the eccentricity of the rotating plate at the upper end of the slider 1. The rotation of the rotating plate can pull the slider 2 to perform reciprocating motion in the slideway 2. The pulling amplitude can be adjusted by changing the eccentricity of the rotating plate. The larger the eccentricity, the greater the pulling amplitude of the slider 2 by the rotating plate. For castings of different lengths, automatic reciprocating grinding can be performed and the reciprocating amplitude can be changed to adapt to its length. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a structural schematic diagram of another angle of the present invention; Figure 3 It is a schematic diagram of the positioning plate structure of the present invention; Figure 4 It is a schematic structural diagram of the clamping mechanism of the present invention; Figure 5 It is a schematic diagram of the rotating plate installation structure of the present invention.

[0018] Labels in the figure: 1. Support frame; 2. Support arm; 201. Clamp; 3. Support plate; 4. Positioning plate; 401. Connecting plate 1; 402. Connecting plate 2; 403. Connecting plate 3; 404. Connecting plate 4; 405. Connecting plate 5; 406. Slide hole; 5. Transmission wheel 1; 501. Transmission wheel 2; 502. Transmission wheel 3; 503. Heat dissipation fan; 504. Transmission belt; 6. Adjustment plate; 601. Positioning seat 1; 602 , positioning seat two; 603, hydraulic rod; 7, driving motor one; 701, driving wheel; 8, bracket one; 801, driving motor two; 802, slide one; 803, mounting hole one; 9, slider one; 901, rotating plate; 902, annular groove; 903, slider two; 904, slide two; 905, support plate; 906, fixing plate one; 907, fixing plate two; 908, pull rod; 909, mounting hole two; 110, sanding belt. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0020] To make the above-mentioned objects, features, and advantages of the present invention more readily apparent, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. The following description sets forth numerous specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0021] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are only used to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction. Therefore, they should not be understood as limiting the present invention.

[0022] Embodiment 1: Combine Figure 1 and Figure 5The present invention provides a grinding machine for casting manufacturing, comprising a support frame 1 and a support arm horizontally mounted on the upper end of the support frame 1, wherein a support plate 3 is relatively vertically arranged at one end of the support arm 2, and a bracket 8 is arranged on the surface of the support plate 3, which is parallel to the support arm 2 and extends radially. The support arm 2 and the bracket 8 are arranged parallel to each other, and the bracket 8 extends to the front end of the support arm 2 so that the clamping mechanism arranged at the front end of the bracket 8 is placed at the front end of the support arm 2 to provide a support platform for the casting, and the clamping mechanism includes a drive motor 2 801 fixedly arranged at the end of the bracket 8, the shaft end of the drive motor is extended upward, and the upper end of the drive shaft of the drive motor 801 is fixedly connected to a slideway 802, the upper end of the slideway 802 is open and the interior is hollow, and the slideway 802 The inner slide is provided with a slider 9, which is a triangular structure, and the slide 1 802 is a triangular structure with the same structure as the slider 1 9, which is more stable when embedded and avoids the loosening of the slider 1 9 during the sliding process. A rotating plate 901 is fixedly provided on the upper end of the slider 9, and the rotating plate 901 and the slider 1 9 are an integrated structure. When the driving motor 2 801 provides a rotation action to the slide 1 802, the slide 1 802 drives the slider 9 to rotate so as to rotate the rotating plate 901. An annular groove 902 is provided on the upper end surface of the rotating plate 901, and the upper end of the annular groove 902 is open. A mounting hole 1 803 is provided at one end of the slider 9, and a mounting hole 2 909 is provided on the end surface of the slide 1 802 close to the mounting hole 1 803. The inner walls of the mounting hole 803 and the mounting hole 2 909 are both An internal thread is provided around the circumference, and a screw extending to the inside of the slideway 802 is threadedly connected through the second mounting hole 909. The end of the screw is threadedly connected to the inside of the mounting hole 803, and the end of the screw is connected to the slider 9. The middle part of the screw is threadedly connected to the mounting hole 803. When the screw is twisted to enter and pull out, the slider 9 can be driven to move in the slideway 802, thereby changing the position of the slider 9 and thus changing the eccentricity of the rotating plate 901. A slideway 2 904 is provided on one side of the slideway 802, and a slider 2 903 is slidingly provided in the slideway 2 904. A pull rod 908 is provided on the lower end surface of the end of the slider 2 903 near the slideway 802. The pull rod 908 is extended in the annular groove 902 at the upper end of the rotating plate 901, and the outer side of the pull rod 908 is connected to the The inner walls of the annular groove 902 are tightly adjacent to each other. When the eccentricity of the rotating plate 901 does not change, the rotation of the rotating plate 901 does not affect the movement of the pull rod 908. When the eccentricity of the rotating plate 901 is changed by the screw, the rotation of the rotating plate 901 can cause a reciprocating pulling and pushing movement of the pull rod 908. The upper end of the slider 903 is provided with a supporting plate 905, and the supporting plate 905 is provided with a positioning device. The positioning device includes a fixing plate 906 and a fixing plate 907. The lower end of the fixing plate 906 is fixedly set on the upper plate surface of the supporting plate 905. The fixing plate 906 and the fixing plate 907 are both provided with corresponding threaded holes. The fixing plate 906 and the fixing plate 907 are connected by bolts and are locked in the threaded holes of the fixing plate 906 and the fixing plate 907.The bottom of the second fixing plate 907 is not connected to the supporting plate 905. When the bolts are twisted, the distance between the first fixing plate 906 and the second fixing plate 907 can be changed. This feature is a prior art and will not be described in detail here.

[0023] As a technical solution of this embodiment, further, combined with Figure 2 , the support arm 2 is provided with a supporting mechanism at one end near the clamping mechanism, and the supporting mechanism includes a positioning plate 4, the positioning plate 4 is arranged perpendicularly to the support arm 2 and is arranged at the end of the support arm 2, and a connecting plate 1 401 is provided in the middle of the rear end of the positioning plate 4, and an arc-shaped sliding hole 406 is opened on the surface of the connecting plate 1 401, and the connecting plate 1 401 is bolted and fixed to the support arm 2 through the arc-shaped sliding hole 406, and a positioning hole for fixing the connecting plate is opened on the side wall of the support arm 2. The inclination angle of the positioning plate 4 can be changed by changing the corresponding position of the arc-shaped sliding hole 406 and the positioning hole, thereby meeting the requirements of the casting for grinding at different angles, and the upper and lower ends of the front end surface of the positioning plate 4 protrude with a connecting plate 2 402 and a connecting plate 3 403 respectively, and the connecting plate 2 402 and the connecting plate 3 The connecting plate three 403 is respectively rotatably installed with a transmission wheel one 5 and a transmission wheel two 501. The directions of the transmission wheel one 5 and the transmission wheel two 501 are the same as the direction of the driving wheel 701, and the shafts of the transmission wheel one 5 and the transmission wheel two 501 extend to the rear ends of the connecting plate two 402 and the connecting plate three 403. The positioning plate 4 is also relatively vertically provided with a connecting plate four 404 and a connecting plate five 405 from top to bottom. The connecting plate four 404 and the connecting plate five 405 are both rotatably installed with heat dissipation fins 503. A transmission belt 504-1 is provided between the heat dissipation fins 503 installed on the connecting plate four 404 and the rear end shaft of the transmission wheel one 5, and a transmission belt 504-2 is provided between the heat dissipation fins 503 installed on the connecting plate five 405 and the rear end shaft of the transmission wheel two 501.

[0024] As a technical solution of this embodiment, further, combined with Figure 2, the upper end surface of the support arm 2 is provided with a splint 201, and an adjustment mechanism placed on the upper end of the support arm 2 is installed through the splint 201, and a drive motor 7 is attached to the surface of the support plate 3 opposite to the support arm 2, and a drive wheel 701 is installed on the shaft end of the drive motor 7, and a sanding belt 110 is sleeved between the drive wheel 701 and the adjustment mechanism and the support mechanism, and the adjustment mechanism includes an adjusting plate 6, one end of the adjusting plate 6 is rotatably mounted on the middle of the splint 201, and a rotatable transmission wheel three 502 is laterally mounted on the other end of the adjusting plate 6, a positioning seat 601 is rotatably mounted in the middle of the adjusting plate 6, and a positioning seat two 602 is rotatably mounted in the middle of the support arm 2, the positioning seat one 601 and the positioning seat two 602 are arranged on the same side, and the positioning seat one 601 and the positioning seat two 602 are arranged on the same side. A hydraulic rod 603 is arranged between them, and the adjustment plate 6 is swingably arranged in the clamping plate 201. At the same time, a hydraulic rod 603 is also arranged between the adjustment plate 6 and the support arm 2. The hydraulic rod 603 continuously props up the support arm 2 to ensure that the support arm 2 is supported upward, so that the sanding belt 110 sleeved between the driving wheel 701, the transmission wheel 1 5, the transmission wheel 2 501 and the transmission wheel 3 502 remains tight, thereby improving its grinding efficiency while ensuring the stability of the sanding belt 110 when it is sleeved. Moreover, when replacing sanding belts 110 of different mesh sizes, it is only necessary to press the support arm 2 downward to loosen the tight sanding belt 110 and take it out. Even when replacing sanding belts 110 of different sizes and lengths, since the support arm 2 can be pressed downward and maintain the upward supporting force in a natural state, it can adapt to the assembly of more sanding belts 110 of different lengths.

[0025] Example 2: This equipment is mainly used for grinding burrs on the outer wall of metal castings. Since sanding belts 110 of different mesh sizes can meet different smoothness requirements when grinding burrs on castings made of different metal materials, sanding belts 110 of different mesh sizes need to be replaced during the grinding process to grind a smoother surface of the casting. During use, the casting to be ground is first placed between fixed plate 1 906 and fixed plate 2 907, and the bolts between fixed plate 1 906 and fixed plate 2 907 are twisted to shorten the clamping distance and clamp the object. At the same time, the screw on one side of slideway 1 802 is twisted according to the length of the object, thereby changing the position of slider 1 9 in slideway 1 802 and the eccentricity of rotating plate 901. The larger the eccentricity, the greater the pulling amplitude of rotating plate 901 on slider 2 903. Automatic reciprocating can be performed for castings of different lengths. Grinding and adapting to the change of the reciprocating amplitude of its length, the rotating plate 901 can continuously push and pull the pull rod 908 at the lower end of the slider 2 903 during the rotation process, driving the support plate 905 to perform continuous reciprocating motion. Further, select a sanding belt 110 with an appropriate mesh size, press down the adjustment plate 6 to set the sanding belt 110 between the driving wheel 701, the transmission wheel 1 5, the transmission wheel 2 501 and the transmission wheel 3 502, release the adjustment plate 6, the hydraulic rod 603 rebounds and pushes the adjustment plate 6 upward, supporting the sanding belt 110, start the drive motor 17 to rotate the driving wheel 701 and drive the entire sanding belt 110 to rotate. In the driven state of the transmission wheel 1 5 and the transmission wheel 2 501, the heat dissipation fan 503 can be driven to rotate at the same time and the sanding belt 110 in the action state can be continuously blown to cool down, thereby reducing the heat generated by the sanding belt 110 that is in continuous contact with the casting.

[0026] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention; therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is limited by the appended claims rather than the above description. Therefore, it is intended that all changes that fall within the meaning and scope of the equivalent elements of the claims are included in the present invention, and any figure marks in the claims should not be regarded as limiting the claims involved.

[0027] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A grinding machine for casting manufacturing, comprising a support frame (1) and a support arm transversely mounted on the upper end of the support frame (1), characterized in that: A support plate (3) is provided at one end of the support arm (2) in a relatively vertical manner, a bracket (8) is provided on the surface of the support plate (3) and is parallel to the support arm (2) and extends radially, a clamping mechanism is provided at the extended end of the bracket (8), a support mechanism is provided at one end of the support arm (2) close to the clamping mechanism, a clamping plate (201) is provided on the upper end surface of the support arm (2), an adjustment mechanism disposed on the upper end of the support arm (2) is installed through the clamping plate (201), a drive motor (7) is attached and installed on the surface of the support plate (3) opposite to the support arm (2), a drive wheel (701) is installed on the shaft end of the drive motor (7), and a sanding belt (110) is sleeved between the drive wheel (701), the adjustment mechanism and the support mechanism.

2. A grinding machine for casting manufacturing according to claim 1, characterized in that: The support mechanism comprises a positioning plate (4), a connecting plate (401) is provided at the middle of the rear end of the positioning plate (4), an arc-shaped sliding hole (406) is provided on the surface of the connecting plate (401), and the connecting plate (401) is bolted and fixed to the support arm (2) through the arc-shaped sliding hole (406).

3. A grinding machine for casting manufacturing according to claim 2, characterized in that: The upper and lower ends of the front end surface of the positioning plate (4) are respectively protruded with a connecting plate 2 (402) and a connecting plate 3 (403), and the connecting plate 2 (402) and the connecting plate 3 (403) are respectively rotatably mounted with a transmission wheel 1 (5) and a transmission wheel 2 (501), and the positioning plate (4) is also relatively vertically arranged with a connecting plate 4 (404) and a connecting plate 5 (405) from top to bottom, and the connecting plate 4 (404) and the connecting plate 5 (405) are both rotatably mounted with a heat dissipation fan (503), and a transmission belt (504) 1 is provided between the heat dissipation fan (503) installed on the connecting plate 4 (404) and the transmission wheel 1 (5), and a transmission belt (504) 2 is provided between the heat dissipation fan (503) installed on the connecting plate 5 (405) and the transmission wheel 2 (501) bracket.

4. A grinding machine for casting manufacturing according to claim 1, characterized in that: The adjustment mechanism comprises an adjustment plate (6), one end of which is rotatably mounted on the middle of the clamping plate (201), and the other end of which is laterally mounted with a rotatable transmission wheel three (502).

5. A grinding machine for casting production according to claim 4, characterized in that: A first positioning seat (601) is rotatably mounted in the middle of the adjustment plate (6), and a second positioning seat (602) is rotatably mounted in the middle of the support arm (2). The first positioning seat (601) and the second positioning seat (602) are arranged on the same side, and a hydraulic rod (603) is arranged between the first positioning seat (601) and the second positioning seat (602).

6. A grinding machine for casting production according to claim 1, characterized in that: The clamping mechanism includes a driving motor 2 (801) fixedly arranged at the end of the bracket 1 (8), the upper end of the driving shaft of the driving motor 2 (801) is fixedly connected to a slideway 1 (802), the upper end of the slideway 1 (802) is open and the interior is hollow, a slider 1 (9) is slidably arranged in the slideway 1 (802), a rotating plate (901) is fixedly arranged at the upper end of the slider 1 (9), and an annular groove (902) is opened on the upper end surface of the rotating plate (901).

7. A grinding machine for casting production according to claim 6, characterized in that: The slider 1 (9) has a mounting hole 1 (803) at one end, and the slideway 1 (802) has a mounting hole 2 (909) on its end surface close to the mounting hole 1 (803). A screw extending into the interior of the slideway 1 (802) is threadedly connected through the mounting hole 2 (909), and the end of the screw is threadedly connected to the interior of the mounting hole 1 (803).

8. A grinding machine for casting production according to claim 6, characterized in that: A slideway 2 (904) is provided on one side of the slideway 1 (802), and a slider 2 (903) is slidably provided in the slideway 2 (904). A pull rod (908) is provided on the lower end surface of the end of the slider 2 (903) close to the slideway 1 (802), and the pull rod (908) is extended and provided in the annular groove (902) at the upper end of the rotating plate (901). A support plate (905) is provided at the upper end of the slider 2 (903), and a positioning device is provided on the support plate (905).

9. A grinding machine for casting production according to claim 8, characterized in that: The positioning device includes a fixing plate 1 (906) and a fixing plate 2 (907), wherein the lower end of the fixing plate 1 (906) is fixedly arranged on the upper plate surface of the support plate (905), and the fixing plate 1 (906) and the fixing plate 2 (907) are both provided with corresponding threaded holes, and the fixing plate 1 (906) and the fixing plate 2 (907) are connected by bolts and locked in the threaded holes of the fixing plate 1 (906) and the fixing plate 2 (907).

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