A polyethylene production mixing device for plastic-coated pipes

Abstract

The application discloses a kind of polyethylene production mixing equipment for plastic-coated pipe, including box, agitating mechanism is arranged in the box;The agitating mechanism includes motor, short reciprocating screw rod, stirring plate one, stirring plate two, the motor is fixedly installed at the top of box, the motor output end is fixedly installed with short shaft, the short shaft penetrates the top of box, and the outer wall of the short shaft is rotatably connected with the box by bearing one, the short shaft bottom end is fixedly installed with rotating frame, the inner wall bottom of the box is fixedly installed with long reciprocating screw rod, by setting agitating mechanism, stirring plate one can be made while doing circular motion, stirring plate two does left and right reciprocating movement, to improve the flowability of polyethylene raw materials in the box, improve the mixing quality of polyethylene raw materials, solve the problem of low mixing efficiency in the comparative document, stirring blade stirring range is smaller, leading to stirring blade makes the flowability of polyethylene raw materials poor, thereby affecting the mixing quality of polyethylene raw materials.

Description

Technical Field

[0001] This invention relates to the field of production and processing equipment technology, specifically to a polyethylene production mixing equipment for coated pipes. Background Technology

[0002] Plastic-coated pipes are steel-plastic composite pipes made by fusing a layer of 0.5-1.0 mm thick polyethylene (PE) resin, ethylene-acrylic acid copolymer (EAA), epoxy (EP) powder, non-toxic polypropylene (PP) or non-toxic polyvinyl chloride (PVC) and other organic materials onto the inner wall of a steel pipe. They not only have the advantages of steel pipes, such as high strength, easy connection, and resistance to water flow impact, but also overcome the disadvantages of steel pipes, such as easy corrosion, pollution, and scaling when exposed to water, and the disadvantages of plastic pipes, such as low strength and poor fire resistance. The design life can reach 50 years.

[0003] According to Chinese patent disclosure CN213137375U, a polyethylene production mixing device for coated pipes is disclosed. This patent uses a drive motor to rotate a lead screw, which in turn moves a nut along the lead screw. The nut then moves a stirring blade along the axial direction of the lead screw. Simultaneously, the drive motor can rotate a sleeve, which in turn rotates a rotating frame. This allows the stirring blade to move up and down along the lead screw while also rotating axially, improving the uniformity of the polyethylene production mixing. The single drive motor rotating the lead screw reduces the size of the device and lowers energy consumption. By installing a scraper on the rotating frame, polyethylene production material adhering to the inner wall can be effectively cleaned to the bottom of the container. This polyethylene production mixing device for coated pipes has a simple structure, is easy to use, and can be widely applied.

[0004] However, the stirring blade in this patent has a small stirring range, which results in poor flowability of the polyethylene raw material, thus affecting the mixing quality of the polyethylene raw material and causing low mixing efficiency. Therefore, we propose a polyethylene production mixing equipment for coated pipes. Summary of the Invention

[0005] The purpose of this invention is to provide a mixing equipment for producing polyethylene for coated pipes, so as to solve the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a mixing equipment for producing polyethylene for coated pipes, comprising a box body, wherein an agitation mechanism is provided in the box body;

[0007] The agitation mechanism includes a motor, a short reciprocating lead screw, a first agitator, and a second agitator. The motor is fixedly mounted on the top of the housing. A short rotating shaft is fixedly mounted on the output end of the motor, passing through the top of the housing. The outer wall of the short rotating shaft is rotatably connected to the housing via a first bearing. A rotating frame is fixedly mounted on the bottom end of the short rotating shaft. A long reciprocating lead screw is fixedly mounted on the bottom end of the inner wall of the housing, extending into the rotating frame. A fixing block is fixedly mounted on the inner wall of the rotating frame near the bottom end. The fixing block is rotatably sleeved on the outer wall of the long reciprocating lead screw via a second bearing. The short reciprocating lead screw passes through one side of the rotating frame, and its outer wall is connected to the housing via a third bearing. The frame is rotatably connected. A bevel gear 2 is fixedly installed at one end of the short reciprocating screw, and a bevel gear 1 is fixedly sleeved on the outer wall of the long reciprocating screw. The bevel gear 1 and the bevel gear 2 mesh. A rotating groove is opened at one end of the stirring plate 1, and the other end of the short reciprocating screw is inserted into the rotating groove. The outer wall of the short reciprocating screw is rotatably connected to the stirring plate 1 through a bearing 4. A connecting rod 2 is fixedly installed between one end of the stirring plate 1 and one side of the rotating frame. A limiting connecting block 1 is threaded on the outer wall of the short reciprocating screw. A limiting sliding groove 1 is opened on both the front and back of the stirring plate 1. The limiting connecting block 1 movably passes through the limiting sliding groove 1 and the stirring plate 2 is fixedly connected to the limiting connecting block 1.

[0008] According to the above technical solution, the number of stirring plates one is six, and the number of stirring plates two on each stirring plate one is two, thereby increasing the stirring range and improving the stirring efficiency.

[0009] According to the above technical solution, the limiting block one is slidably connected to the limiting slide groove one. By setting the limiting slide groove one, the limiting block one can be limited, thereby improving the stability of the limiting block one when moving.

[0010] According to the above technical solution, a partition is fixedly installed on the top of the housing, and the motor is set inside the partition. By setting the partition, the motor can be protected to a certain extent and the normal service life of the motor can be guaranteed.

[0011] According to the above technical solution, a shaking mechanism is provided on both the front and back of the rotating frame. The shaking mechanism includes a second limiting block, a vertical stirring plate, and a shaking plate. The second limiting block is threaded onto the outer wall of the long reciprocating screw. The front and back of the rotating frame are provided with a second limiting groove. The second limiting block moves through the rotating frame through the second limiting groove. The vertical stirring plate is fixedly connected to the second limiting block. A first limiting rod and a second limiting rod are fixedly installed at the top and bottom of the vertical stirring plate. The shaking plate has two rod holes. The first and second limiting rods move through the shaking plate through the two rod holes. The outer walls of the first and second limiting rods are surrounded by springs. One end of the spring is fixedly installed at the bottom of the shaking plate, and the other end of the spring is fixedly installed at the top of the vertical stirring plate. By setting the springs, the shaking plate can be made to shake under the inertia of the springs.

[0012] According to the above technical solution, the first limiting rod and the second limiting rod are adapted to the two rod holes. By setting the first limiting rod and the second limiting rod, the shaking plate can be limited, thereby improving the stability of the shaking plate.

[0013] According to the above technical solution, a discharge port is provided at the bottom of the box, and a discharge pipe is connected to the bottom of the box. A ramp is fixedly installed at the bottom of the inner wall of the box. By setting the ramp, polyethylene can be more easily guided into the discharge port after passing through the ramp, further reducing the residue of polyethylene inside the box when the equipment discharges.

[0014] According to the above technical solution, a connecting rod is fixedly installed at the other end of the stirring plate, and a scraper is fixedly installed at one end of the connecting rod, and the scraper is slidably connected to the inner wall of the box.

[0015] According to the above technical solution, a feeding funnel is connected to the top of the box body. By setting the feeding funnel, it is convenient for personnel to add materials to the box body through the feeding funnel.

[0016] According to the above technical solution, support legs are fixedly installed on both sides of the outer wall of the box near the bottom. A base plate is fixedly installed at the bottom of the support legs, and a rubber pad is fixedly installed at the bottom of the base plate. By setting the rubber pad, the equipment can play a certain role in shock absorption, reduce the wear caused by vibration to the structure of the equipment, and improve the service life of the equipment.

[0017] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0018] (1) The polyethylene production mixing equipment for the plastic-coated pipe, by setting an agitation mechanism, can make the first agitator move in a circular motion while the second agitator moves back and forth, thereby improving the fluidity of the polyethylene raw material inside the box and improving the mixing quality of the polyethylene raw material. This solves the problem in the comparative document that the agitator blade has a small mixing range, which leads to poor fluidity of the polyethylene raw material, thus affecting the mixing quality of the polyethylene raw material and resulting in low mixing efficiency.

[0019] (2) The polyethylene production mixing equipment for the plastic-coated pipe can be equipped with a shaking mechanism, which can make the vertical stirring plate move up and down and the shaking plate move back and forth while making circular motion, thereby vertically stirring the polyethylene raw material, further improving the flow disorder of the polyethylene raw material inside the box, improving the uniformity of polyethylene production mixing, and is highly practical.

[0020] (3) The polyethylene production mixing equipment for the plastic-coated pipe is equipped with a connecting rod and a scraper, which can scrape off the polyethylene adhering to the inside of the box, reduce the polyethylene residue inside the box, reduce the difficulty of subsequent cleaning by personnel, and has a simple structure and strong practicality.

[0021] (4) The polyethylene production mixing equipment for the plastic-coated pipe can make polyethylene easier to enter the discharge port after being guided by the ramp, further reducing the residue of polyethylene in the box when the equipment is discharged. By setting rubber pads, the equipment can play a certain role in shock absorption, reducing the wear caused by vibration to the structure of the equipment and improving the service life of the equipment. Attached Figure Description

[0022] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0023] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 This is a schematic diagram of the front cross-sectional structure of the present invention;

[0025] Figure 3 This is a schematic diagram of the side cross-sectional structure of the present invention;

[0026] Figure 4 This is a schematic diagram of the top cross-sectional structure of the stirring plate of the present invention;

[0027] Figure 5 For the present invention Figure 2 Enlarged structural diagram of section A in the middle;

[0028] Figure 6 For the present invention Figure 2 Enlarged structural diagram of section B in the middle;

[0029] Figure 7 For the present invention Figure 3 Enlarged structural diagram of section C.

[0030] In the diagram: 1. Box body; 2. Agitating mechanism; 3. Vibrating mechanism; 4. Connecting rod one; 5. Scraper; 6. Discharge port; 7. Slope; 8. Discharge pipe; 9. Divider box; 10. Feed hopper; 11. Support leg; 12. Base plate; 13. Rubber pad; 201. Motor; 202. Short rotating shaft; 203. Rotating frame; 204. Long reciprocating lead screw; 205. Bevel gear one; 206. Bevel gear two; 2 07. Short reciprocating lead screw; 208. Stirring plate one; 209. Limiting block one; 210. Rotary groove; 211. Connecting rod two; 212. Fixing block; 213. Stirring plate two; 214. Limiting slide groove one; 301. Limiting block two; 302. Limiting slide groove two; 303. Vertical stirring plate; 304. Limiting rod one; 305. Spring; 306. Shaking plate; 307. Rod hole; 308. Limiting rod two. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] Example 1:

[0033] A preferred embodiment of the polyethylene production mixing equipment for coated pipes provided by the present invention is as follows: Figures 1 to 7 As shown: A mixing equipment for producing polyethylene for coated pipes includes a housing 1, and an agitator 2 is installed in the housing 1;

[0034] Furthermore, a discharge port 6 is provided at the bottom of the box 1, a discharge pipe 8 is connected to the bottom of the box 1, and a ramp 7 is fixedly installed at the bottom of the inner wall of the box 1.

[0035] By setting up the ramp 7, polyethylene can more easily enter the discharge port 6 after being guided by the ramp 7, further reducing the amount of polyethylene residue inside the box 1 when the equipment discharges.

[0036] Furthermore, a feed hopper 10 is connected to the top of the housing 1;

[0037] The feeding funnel 10 facilitates the feeding of materials into the box 1 by personnel.

[0038] Furthermore, support legs 11 are fixedly installed on both sides of the outer wall of the box 1 near the bottom, and a base plate 12 is fixedly installed at the bottom of the support legs 11, and a rubber pad 13 is fixedly installed at the bottom of the base plate 12.

[0039] By setting rubber pads 13, the equipment can be damped to a certain extent, reducing the wear and tear on the equipment structure caused by vibration and improving the service life of the equipment.

[0040] The stirring mechanism 2 includes a motor 201, a short reciprocating lead screw 207, a first stirring plate 208, and a second stirring plate 213. The motor 201 is fixedly installed at the top of the housing 1. A short rotating shaft 202 is fixedly installed at the output end of the motor 201. The short rotating shaft 202 passes through the top of the housing 1, and its outer wall is rotatably connected to the housing 1 via a first bearing. A rotating frame 203 is fixedly installed at the bottom of the short rotating shaft 202. A long reciprocating lead screw 204 is fixedly installed at the bottom of the inner wall of the housing 1. The long reciprocating lead screw 204 extends into the rotating frame 203, and a fixing block 212 is fixedly installed near the bottom of the inner wall of the rotating frame 203. The fixing block 212 is rotatably sleeved on the outer wall of the long reciprocating lead screw 204 via a second bearing. The short reciprocating lead screw 207 passes through one side of the rotating frame 203, and its outer wall is rotatably connected to the rotating frame 203 via a third bearing. The short reciprocating screw 207 is fixedly mounted with a bevel gear 206 at one end, and a bevel gear 205 is fixedly sleeved on the outer wall of the long reciprocating screw 204. The bevel gear 205 meshes with the bevel gear 206. A rotating groove 210 is opened at one end of the stirring plate 208, and the other end of the short reciprocating screw 207 is inserted into the rotating groove 210. The outer wall of the short reciprocating screw 207 is rotatably connected to the stirring plate 208 through a bearing 4. A connecting rod 211 is fixedly installed between one end of the stirring plate 208 and one side of the rotating frame 203. A limiting block 209 is threaded on the outer wall of the short reciprocating screw 207. A limiting groove 214 is opened on both the front and back of the stirring plate 208. The limiting block 209 moves through the stirring plate 208 through the limiting groove 214. The stirring plate 213 is fixedly connected to the limiting block 209.

[0041] Specifically, in the above technical solution, the motor 201 is started, which drives the short rotating shaft 202 to rotate. The short rotating shaft 202 drives the rotating frame 203 to rotate. The rotating frame 203 drives the short reciprocating screw 207 to perform circular motion, and through the connecting rod 211, it drives the stirring plate 208 to perform circular motion. The short reciprocating screw 207 drives the bevel gear 206 to perform circular motion. The bevel gear 206 rotates under the action of the bevel gear 205, and the bevel gear 206 drives the short reciprocating screw 207 to rotate. The short reciprocating screw 207 then drives... The limiting connecting block 209 moves back and forth, which in turn drives the stirring plate 213 to move back and forth. This mechanism allows the stirring plate 208 to move in a circular motion while the stirring plate 213 moves back and forth, thereby improving the fluidity of the polyethylene raw material inside the box 1 and improving the mixing quality of the polyethylene raw material. This solves the problem in the comparative document where the stirring blade has a small stirring range, resulting in poor fluidity of the polyethylene raw material and thus affecting the mixing quality and low mixing efficiency.

[0042] Furthermore, there are six stirring plates 208, and each stirring plate 208 has two stirring plates 213, which increases the stirring range and improves the stirring efficiency.

[0043] Furthermore, the limiting connecting block 209 is slidably connected to the limiting slide groove 214;

[0044] Among them, by setting the limiting slide groove 214, the limiting block 209 can be limited, thereby improving the stability of the limiting block 209 when it moves.

[0045] Furthermore, a partition box 9 is fixedly installed on the top of the housing 1, and the motor 201 is located inside the partition box 9;

[0046] The partition 9 provides a certain degree of protection for the motor 201, ensuring its normal service life.

[0047] Example 2:

[0048] Based on Embodiment 1, a preferred embodiment of the polyethylene production mixing equipment for coated pipes provided by the present invention is, for example... Figures 1 to 7 As shown: Both the front and back of the rotating frame 203 are equipped with a shaking mechanism 3. The shaking mechanism 3 includes a second limiting block 301, a vertical stirring plate 303, and a shaking plate 306. The second limiting block 301 is threaded onto the outer wall of the long reciprocating screw 204. The front and back of the rotating frame 203 are both provided with a second limiting groove 302. The second limiting block 301 movably passes through the rotating frame 203 via the second limiting groove 302. The vertical stirring plate 303 is fixedly connected to the second limiting block 301. A first limiting rod 304 is fixedly installed at the top and bottom of the vertical stirring plate 303. Rod 2 308 and shaking plate 306 have rod holes 307. There are two rod holes 307. Limiting rod 1 304 and limiting rod 2 308 pass through the two rod holes 307 and move through the shaking plate 306. The outer walls of limiting rod 1 304 and limiting rod 2 308 are surrounded by springs 305. One end of spring 305 is fixedly installed at the bottom of shaking plate 306, and the other end of spring 305 is fixedly installed at the top of vertical stirring plate 303. By setting spring 305, shaking plate 306 can be made to shake under the inertia of spring 305.

[0049] Specifically, in the above technical solution, when the rotating frame 203 rotates, it also drives the second limiting block 301 to rotate. The second limiting block 301 moves up and down reciprocally under the action of the long reciprocating screw 204. The second limiting block 301 drives the vertical stirring plate 303 to move up and down reciprocally. The vertical stirring plate 303 drives the shaking plate 306 to move up and down reciprocally through the first limiting rod 304 and the second limiting rod 308. Under the inertia of the spring 305, the shaking plate 306 generates up and down shaking. Thus, while the vertical stirring plate 303 is making circular motion, the vertical stirring plate 303 and the shaking plate 306 move up and down reciprocally, which vertically stirs the polyethylene raw material, thereby further improving the flow turbulence of the polyethylene raw material inside the box 1 and improving the uniformity of polyethylene production mixing. It is highly practical.

[0050] Furthermore, the first limiting rod 304 and the second limiting rod 308 are adapted to the two rod holes 307;

[0051] By setting limit rod 1 304 and limit rod 2 308, the shaking plate 306 can be limited, thereby improving the stability of the shaking plate 306.

[0052] Example 3:

[0053] Based on Embodiment 1, a preferred embodiment of the polyethylene production mixing equipment for coated pipes provided by the present invention is, for example... Figures 1 to 7 As shown: A connecting rod 4 is fixedly installed at the other end of the stirring plate 208, and a scraper 5 is fixedly installed at one end of the connecting rod 4. The scraper 5 is slidably connected to the inner wall of the box 1.

[0054] Specifically, in the above technical solution, the stirring plate 208 drives the scraper 5 to make a circular motion through the connecting rod 4, so that the scraper 5 scrapes off the polyethylene attached to the inside of the box 1, reducing the polyethylene residue inside the box 1, reducing the difficulty of subsequent cleaning by personnel, and the structure is simple and highly practical.

[0055] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0056] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A polyethylene production compounding plant for plastic coated pipes, comprising a tank (1), characterized in that: The box (1) is provided with an agitating mechanism (2); The agitating mechanism (2) comprises a motor (201), a short reciprocating screw rod (207), a stirring plate one (208) and a stirring plate two (213), the motor (201) is fixedly installed at the top end of the box (1), a short rotating shaft (202) is fixedly installed at the output end of the motor (201), the short rotating shaft (202) penetrates through the top end of the box (1), and the outer wall of the short rotating shaft (202) is rotatably connected with the box (1) through a bearing one, a rotating frame (203) is fixedly installed at the bottom end of the short rotating shaft (202), a long reciprocating screw rod (204) is fixedly installed at the inner bottom wall of the box (1), the long reciprocating screw rod (204) extends into the rotating frame (203), a fixed block (212) is fixedly installed at the inner wall of the rotating frame (203) close to the bottom end, the fixed block (212) is rotatably sleeved on the outer wall of the long reciprocating screw rod (204) through a bearing two, the short reciprocating screw rod (207) penetrates through one side of the rotating frame (203), and the outer wall of the short reciprocating screw rod (207) is rotatably connected with the rotating frame (203) through a bearing three, an umbrella gear two (206) is fixedly installed at one end of the short reciprocating screw rod (207), an umbrella gear one (205) is fixedly sleeved on the outer wall of the long reciprocating screw rod (204), the umbrella gear one (205) is engaged with the umbrella gear two (206), a rotating groove (210) is formed at one end of the stirring plate one (208), the other end of the short reciprocating screw rod (207) is inserted into the rotating groove (210), and the outer wall of the short reciprocating screw rod (207) is rotatably connected with the stirring plate one (208) through a bearing four, a connecting rod two (211) is fixedly installed between one end of the stirring plate one (208) and one side of the rotating frame (203), a limiting connecting block one (209) is threadedly sleeved on the outer wall of the short reciprocating screw rod (207), limiting sliding grooves one (214) are formed on the front and back surfaces of the stirring plate one (208), the limiting connecting block one (209) movably penetrates through the stirring plate one (208) through the limiting sliding grooves one (214), and the stirring plate two (213) is fixedly connected with the limiting connecting block one (209). The front and back of the rotating frame (203) are provided with a shaking mechanism (3), the shaking mechanism (3) comprises a limiting connecting block two (301), a vertical stirring plate (303) and a shaking plate (306), the limiting connecting block two (301) is threadedly sleeved on the outer wall of the long reciprocating lead screw (204), the front and back of the rotating frame (203) are provided with a limiting sliding groove two (302), the limiting connecting block two (301) is movably penetrated into the rotating frame (203) through the limiting sliding groove two (302), the vertical stirring plate (303) is fixedly connected with the limiting connecting block two (301), the vertical stirring plate (303) is fixedly installed with a limiting rod one (304) and a limiting rod two (308) at the top and bottom ends, a rod hole (307) is formed in the shaking plate (306), the number of the rod holes (307) is two, the limiting rod one (304) and the limiting rod two (308) are movably penetrated into the shaking plate (306) through the two rod holes (307), springs (305) are arranged around the outer walls of the limiting rod one (304) and the limiting rod two (308), one end of the spring (305) is fixedly installed at the bottom end of the shaking plate (306), and the other end of the spring (305) is fixedly installed at the top end of the vertical stirring plate (303).

2. A polyethylene compounder for producing a plastic coated pipe according to claim 1, characterized in that: The number of the stirring plates one (208) is six, and the number of the stirring plates two (213) on each stirring plate one (208) is two.

3. A polyethylene compounder for producing a plastic coated pipe according to claim 1, characterized in that: The limiting connecting block one (209) is slidably connected with the limiting sliding groove one (214).

4. A polyethylene compounder for producing a plastic coated pipe according to claim 1, wherein: The top end of the box body (1) is fixedly installed with a partition box (9), and the motor (201) is arranged in the partition box (9).

5. A polyethylene compounder for producing a plastic coated pipe according to claim 1, wherein: The limiting rod one (304), the limiting rod two (308) and the two rod holes (307) are matched.

6. A polyethylene compounder for producing a plastic coated pipe according to claim 1, wherein: A discharge port (6) is formed in the bottom end of the box body (1), a discharge pipe (8) is arranged in communication with the bottom end of the box body (1), and a slope table (7) is fixedly installed on the inner wall of the box body (1).

7. A polyethylene compounder for producing a plastic coated pipe according to claim 1, wherein: The other end of the stirring plate one (208) is fixedly installed with a connecting rod one (4), one end of the connecting rod one (4) is fixedly installed with a scraper (5), and the scraper (5) is slidably connected with the inner wall of the box body (1).

8. A polyethylene compounder for producing a plastic coated pipe according to claim 1, characterized in that: A feeding hopper (10) is arranged in communication with the top end of the box body (1).

9. A polyethylene compounder for producing a plastic coated pipe according to claim 1, characterized in that: Supporting legs (11) are fixedly installed on the both sides of the outer wall of the box body (1) and close to the bottom end, a bottom plate (12) is fixedly installed at the bottom end of the supporting leg (11), and a rubber pad (13) is fixedly installed at the bottom end of the bottom plate (12).

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