Oil way cleaning mechanism of injection molding machine

Abstract

The invention relates to the technical field of injection molding machines, and discloses an injection molding machine oil way cleaning mechanism which comprises a frame body, an oil tank and an injection molding machine, a filtering device is arranged on the front surface of the frame body, the oil tank is fixedly connected to the upper portion of the left side of the frame body, and the injection molding machine is arranged on the upper portion of the frame body; an oil tank fixing device is arranged on the outer side of the oil tank, the filtering device comprises a filter, and a cover plate is fixedly connected to the upper end of the filter. Through arrangement of the cover plate, the oil outlet, the filter, the oil inlet, the rotating shaft, the impeller, a baffle plate, a movable sleeve, filter paper, a cleaning rod, an oil return opening and a three-way connector, impurities in hydraulic oil can be effectively filtered out, cleanliness of an oil way is guaranteed, the service life of the injection molding machine is prolonged, meanwhile, the impeller can be driven to rotate through force generated when the oil way moves, and the service life of the injection molding machine is prolonged. And the inner surface of the filter paper is cleaned through the cleaning rod to improve the filtering effect.

Description

Technical Field

[0001] The invention relates to the technical field of injection molding machines, in particular to an oil circuit cleaning mechanism for an injection molding machine. Background Art

[0002] Injection molding machines are industrial equipment used to produce plastic products. Their working principle is to inject plastic material into a mold through heat and pressure to form the desired shape. Injection molding machines are widely used to manufacture a variety of plastic parts, ranging from daily necessities to complex industrial components.

[0003] In the prior art, a large number of hydraulic components are often required inside the injection molding machine to ensure the normal operation of the internal injection molding process. Therefore, when planning the equipment, it is necessary to simultaneously plan the pipelines for the internal oil circuits.

[0004] However, in actual use, since the existing filters often use the filter paper and filter screen inside to clean and purify the hydraulic oil passing through them, as time goes by, the filter paper and filter screen are easily clogged by impurities, resulting in poor oil circuits and affecting the normal operation of the injection molding machine. In addition, impurities in the oil circuit may also cause wear on the hydraulic components and shorten the service life of the equipment. In view of this, we propose an injection molding machine oil circuit cleaning mechanism. Summary of the invention

[0005] In view of the deficiencies of the prior art, the present invention provides an injection molding machine oil circuit cleaning mechanism, which solves the problem in the prior art that the internal filtering efficiency of the filter decreases rapidly during long-term use.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: an injection molding machine oil circuit cleaning mechanism, comprising a frame body, an oil tank, and an injection molding machine, wherein a filtering device is arranged at the front surface of the frame body, an oil tank is fixedly connected to the upper left side of the frame body, an injection molding machine is arranged at the upper part of the frame body, and an oil tank fixing device is arranged at the outer side of the oil tank;

[0007] The filtering device includes a filter, a cover plate is fixedly connected to the upper end of the filter, an oil outlet is opened at the left side of the upper outer arc surface of the filter, an oil inlet is opened at the right side of the upper outer arc surface of the filter, a baffle is slidably connected to the upper inner arc surface of the filter, a movable sleeve is fixedly connected to the inner arc surface of the baffle, filter paper is clamped at the lower surface of the movable sleeve, an oil return port is opened at the lower end of the filter, a rotating shaft is rotatably connected to the lower part of the inner arc surface of the filter, an impeller is fixedly connected to the upper part of the outer arc surface of the rotating shaft, a cleaning rod is fixedly connected to the lower part of the outer arc surface of the rotating shaft, a three-way joint is fixedly connected to the lower part of the filter, and a pressure detection device is arranged on the upper part of the filter.

[0008] Preferably, the oil tank fixing device includes a support plate, a stop block is fixedly connected to the front of the upper surface of the support plate, a connecting block is fixedly connected to the upper surface of the support plate, an inner surface of the connecting pipe is rotatably connected to a hinge shaft, a piston plate is fixedly connected to the middle of the outer arc surface of the hinge shaft, a damping chamber is connected to the piston in the middle of the outer arc surface of the hinge shaft, both ends of the hinge shaft are fixedly connected to elastic telescopic rods, and the upper part of the elastic telescopic rods is hinged with a retaining ring.

[0009] Preferably, the pressure detection device includes a top plate, a pressure sensor is fixedly connected to the upper surface of the top plate, a warning light bar is fixedly connected to the outer arc surface of the pressure sensor, a connecting bolt is threadedly connected to the inner surface of the top plate, an electric push rod is fixedly connected to the lower surface of the top plate, and a detection probe is fixedly connected to the lower end of the pressure sensor.

[0010] Preferably, a circular protrusion is provided at the lower part of the inner arc surface of the filter, a filter paper clip is provided at the upper surface of the circular protrusion at the lower part of the inner arc surface of the filter, and a plurality of threaded through holes are provided on the inner surface of the cover plate.

[0011] Preferably, the oil outlet and the oil inlet are symmetrically distributed with the center line of the filter as the symmetry axis, and the baffle plate is arranged to be inclined as a whole, with the left side of the baffle plate higher than the upper edge of the oil outlet, and the right side of the baffle plate lower than the lower edge of the oil inlet, a through hole is opened at the center of the inner surface of the baffle plate, and a filter paper clip is arranged at the lower surface of the movable sleeve.

[0012] Preferably, the oil return port is connected to the three-way joint below, the upper end of the rotating shaft is rotatably connected to the cover plate, a plurality of groups of inclined arc blades are arranged on the outer arc surface of the impeller, the height of the impeller is lower than the upper edge of the movable sleeve, and the outer arc surface of the cleaning rod is in contact with the filter paper.

[0013] Preferably, the support plate is provided with a through hole in the lower area of ​​the oil tank, the end of the support plate away from the oil tank is fixedly connected to the main frame, the block is arranged in an arc shape as a whole, the inner arc surface of the block is in contact with the oil tank, a through hole is provided at the center of the inner surface of the connecting block, the outer arc surface of the piston plate is connected to the damping chamber piston, the inner surface of the piston plate is provided with multiple groups of through holes, and the damping fluid is stored inside the damping chamber.

[0014] Preferably, both front and rear ends of the damping bin are provided with through holes, the lower end of the damping bin is fixedly connected to the support plate, the lower end of the elastic telescopic rod is provided with a through hole, the clamping ring is made of plastic, and the curvature of the inner arc surface of the clamping ring is the same as the curvature of the outer arc surface of the fuel tank.

[0015] Preferably, the inner surface of the top plate is provided with a plurality of groups of threaded through holes, the lower surface of the top plate contacts a cover plate, a through hole is provided at the center of the inner surface of the cover plate, and a through hole is provided on the inner surface of the cover plate, and the connecting bolts fix the cover plate and the top plate through their own outer arc surface threads.

[0016] Preferably, the lower movable end of the electric push rod is fixedly connected to the shielding plate, the outer surface of the detection probe is fixedly connected to the cover plate, and the outer arc surface of the fixed end of the electric push rod is fixedly connected to the cover plate.

[0017] Working principle: When the device is in use, the oil inlet, oil outlet and oil return port need to be connected with the oil circuit. At this time, the flowing hydraulic oil will enter the device from the oil inlet under the push of the oil pump. At this time, due to the shielding of the inner surface of the filter by the baffle plate, the hydraulic oil entering the filter can only enter the filter paper area along the upper part of the movable sleeve, and after being filtered, the oil level inside the filter is gradually increased through the filter paper, and finally discharged from the oil outlet without filter paper. At the same time, during the filtering process, since the hydraulic oil can only enter from the upper end of the movable sleeve in one direction, the flowing hydraulic oil can synchronously drive the impeller to rotate during the movement. When the impeller rotates, it will synchronously drive the rotating shaft fixedly connected to the inner arc surface to rotate. When the rotating shaft rotates, it will synchronously drive the cleaning rod to rotate, so as to avoid large particles of impurities inside the hydraulic oil staying in a certain position to block the filtering effect of the filter paper. At the same time, since the entry and outflow trajectories of the hydraulic oil inside the device are certain, the filter paper can fully contact with the hydraulic oil waiting to be filtered, so that the overall filtering effect of the device is better.

[0018] At the same time, when the injection molding machine is in normal use, the whole equipment will vibrate to a certain extent, and the whole oil tank will vibrate to a certain extent. At this time, the granular impurities accumulated inside the oil tank will be driven and pollute the oil circuit. At this time, the horizontal vibration of the oil tank will synchronously drive the clamp ring to move, and enable the clamp ring to drive the elastic telescopic rod to contract as a whole, so as to preliminarily buffer the impact force through the elastic force of the elastic telescopic rod itself. At the same time, during the contraction or extension of the elastic telescopic rod, the angle between it and the support plate will change to a certain extent. At this time, the hinge shaft will also be driven by the elastic telescopic rod to rotate. When the hinge shaft rotates, it will synchronously drive the piston plate to rotate. At this time, since the damping fluid is stored inside the damping bin, the piston plate will be hindered by the damping fluid during the rotation process, and the damping fluid will form the motion damping of the piston plate, so that the oil tank is less affected by the vibration of the equipment operation through buffering and motion damping.

[0019] In addition, when oil waiting to be cleaned enters the filter, the internal pressure of the filter will rise, and the detection probe will transmit the pressure status inside the filter to the pressure sensor and display it on its instrument panel. When the internal pressure of the filter is too high or too low, the pressure sensor will transmit the corresponding abnormal signal to the warning light strip, and remind the operator to check whether there is any abnormality at the oil inlet or outlet through the flashing of the warning light strip.

[0020] The present invention provides an injection molding machine oil circuit cleaning mechanism, which has the following beneficial effects:

[0021] 1. The present invention can effectively filter out impurities in the hydraulic oil through the cover plate, oil outlet, filter, oil inlet, rotating shaft, impeller, baffle plate, movable sleeve, filter paper, cleaning rod, oil return port and three-way joint, ensure the cleanliness of the oil circuit, and extend the service life of the injection molding machine. At the same time, the force generated by the movement of the oil circuit can drive the impeller to rotate, and the inner surface of the filter paper can be cleaned by the cleaning rod to improve the filtering effect.

[0022] 2. The present invention can effectively absorb the vibration generated during the operation of the equipment and reduce the impact of the equipment on the oil tank during operation, thereby improving the stability of the oil. In addition, it also reduces the probability of impurities precipitated in the oil tank flowing back to the oil circuit due to vibration.

[0023] 3. The present invention can monitor the pressure state inside the filter in real time, detect and handle abnormal conditions in time, ensure the normal operation of the injection molding machine, and warn of abnormal conditions through the warning light bar when abnormal pressure exists inside the filter, by means of the warning light bar. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A perspective view of the present invention;

[0025] Figure 2 It is a schematic diagram of the external structure of the filter of the present invention;

[0026] Figure 3 It is a schematic diagram of the cross section of the filter of the present invention;

[0027] Figure 4 It is a schematic diagram of the exterior of the fuel tank of the present invention;

[0028] Figure 5 It is a schematic diagram of the cross section of the damping chamber of the present invention;

[0029] Figure 6 It is a schematic diagram of the top plate of the present invention.

[0030] Among them, 1. frame body; 2. filtering device; 3. oil tank fixing device; 4. pressure detection device; 5. oil tank; 6. injection molding machine; 201. cover plate; 202. oil outlet; 203. filter; 204. oil inlet; 205. rotating shaft; 206. impeller; 207. baffle plate; 208. movable sleeve; 209. filter paper; 210. cleaning rod; 211. oil return port; 212. three-way joint; 301. snap ring; 302. elastic telescopic rod; 303. support plate; 304. connecting block; 305. block; 306. hinge shaft; 307. damping chamber; 308. piston plate; 401. warning light bar; 402. connecting bolt; 403. top plate; 404. electric push rod; 405. detection probe; 406. pressure sensor. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the specification of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] Example:

[0033] Please see attached Figure 1 -Attached Figure 3 The embodiment of the present invention provides an injection molding machine oil circuit cleaning mechanism, comprising a frame body 1, an oil tank 5, and an injection molding machine 6. A filter device 2 is provided at the front surface of the frame body 1, the oil tank 5 is fixedly connected to the upper left side of the frame body 1, the injection molding machine 6 is provided at the upper part of the frame body 1, and an oil tank fixing device 3 is provided on the outer side of the oil tank 5;

[0034] The filtering device 2 includes a filter 203, the upper end of which is fixedly connected to a cover plate 201, an oil outlet 202 is provided on the left side of the upper outer arc surface of the filter 203, an oil inlet 204 is provided on the right side of the upper outer arc surface of the filter 203, a baffle plate 207 is slidably connected to the upper inner arc surface of the filter 203, a movable sleeve 208 is fixedly connected to the inner arc surface of the baffle plate 207, a filter paper 209 is clamped on the lower surface of the movable sleeve 208, an oil return port 211 is provided at the lower end of the filter 203, the oil return principle of the oil return port 211 is the prior art, and therefore is not described in detail here, a rotating shaft 205 is rotatably connected to the lower part of the inner arc surface of the filter 203, an impeller 206 is fixedly connected to the upper outer arc surface of the rotating shaft 205, a cleaning rod 210 is fixedly connected to the lower part of the outer arc surface of the rotating shaft 205, a three-way joint 212 is fixedly connected to the lower part of the filter 203, and a pressure detection device 4 is arranged on the upper part of the filter 203.

[0035] A circular protrusion is provided at the lower part of the inner arc surface of the filter 203, so that the return oil port 211 and the oil outlet 202 can be divided, and support can be provided for the rotating shaft 205. A filter paper clip is provided on the upper surface of the circular protrusion at the lower part of the inner arc surface of the filter 203, so the position of the filter paper 209 can be limited by the movable sleeve 208 and the filter paper clip inside the filter 203. A plurality of groups of threaded through holes are provided on the inner surface of the cover plate 201, so that it can accommodate the connecting bolts 402 located therein. The oil outlet 202 and the oil inlet 204 are symmetrically distributed with the center line of the filter 203 as the symmetry axis. The baffle plate 207 is arranged in an inclined shape as a whole. The left side of the baffle plate 207 is higher than the upper edge of the oil outlet 202, and the right side of the baffle plate 207 is higher than the upper edge of the oil outlet 202. It is lower than the lower edge of the oil inlet 204, so that the oil entering the filter 203 can move along the prescribed route to the oil outlet 202 and fully contact the filter paper 209 during the movement. A through hole is provided at the center of the inner surface of the baffle plate 207, so that the movable sleeve 208 can be accommodated inside it. A filter paper bayonet is provided on the lower surface of the movable sleeve 208, and the oil return port 211 is connected to the lower three-way joint 212. The upper end of the rotating shaft 205 is rotatably connected to the cover plate 201. A plurality of groups of inclined arc-shaped blades are provided on the outer arc surface of the impeller 206, so that when the oil flows along a fixed route, it can be driven to rotate. The height of the impeller 206 is lower than the upper edge of the movable sleeve 208, and the outer arc surface of the cleaning rod 210 is in contact with the filter paper 209.

[0036] Please see attached Figure 1 , Attachment Figure 4 And attached Figure 5 The oil tank fixing device 3 includes a support plate 303, a stopper 305 is fixedly connected to the front of the upper surface of the support plate 303, a connecting block 304 is fixedly connected to the upper surface of the support plate 303, an inner surface of the connecting block 304 is rotatably connected to a hinge shaft 306, a piston plate 308 is fixedly connected to the middle of the outer arc surface of the hinge shaft 306, a damping chamber 307 is connected to the piston in the middle of the outer arc surface of the hinge shaft 306, both ends of the hinge shaft 306 are fixedly connected to an elastic telescopic rod 302, and the upper part of the elastic telescopic rod 302 is hinged with a retaining ring 301.

[0037] The support plate 303 is provided with a through hole in the lower area of ​​the oil tank 5, so that it can accommodate the extension of the lower pipeline of the oil tank 5. The end of the support plate 303 away from the oil tank 5 is fixedly connected to the frame body 1. The stopper 305 is arranged in an arc shape as a whole, so that its inner arc surface can fit with the oil tank 5. The inner arc surface of the stopper 305 is in contact with the oil tank 5. A through hole is provided at the center of the inner surface of the connecting block 304, so that the hinge shaft 306 can pass through it and rotate inside it. The outer arc surface of the piston plate 308 is connected to the piston of the damping chamber 307. The inner surface of the piston plate 308 is provided with multiple groups of through holes, so that the piston During the rotation of plate 308, the damping fluid can only move along its internal through hole, thereby hindering the movement of piston plate 308. Damping fluid is stored inside the damping chamber 307. Through holes are provided at both the front and rear ends of the damping chamber 307, so that the hinge shaft 306 can pass through. The lower end of the damping chamber 307 is fixedly connected to the support plate 303. A through hole is provided at the lower end of the elastic telescopic rod 302, so that it can be fixedly connected to the hinge shaft 306. The retaining ring 301 is made of plastic material, so it can produce a certain deformation during the installation of the oil tank 5 and clamp the oil tank 5. The curvature of the inner arc surface of the retaining ring 301 is the same as the curvature of the outer arc surface of the oil tank 5.

[0038] Please see attached Figure 1 And attached Figure 6 The pressure detection device 4 includes a top plate 403, a pressure sensor 406 is fixedly connected to the upper surface of the top plate 403, a warning light bar 401 is fixedly connected to the outer arc surface of the pressure sensor 406, a connecting bolt 402 is threadedly connected to the inner surface of the top plate 403, an electric push rod 404 is fixedly connected to the lower surface of the top plate 403, and a detection probe 405 is fixedly connected to the lower end of the pressure sensor 406.

[0039] The inner surface of the top plate 403 is provided with multiple groups of through threaded holes, so that the connecting bolt 402 can maintain the tightness of the connection between the top plate 403 and the cover plate 201 through its own outer arc thread. The lower surface of the top plate 403 contacts the cover plate 201, and a through hole is provided at the center of the inner surface of the cover plate 201, so that the detection probe 405 can be extended into the interior of the filter 203. The inner surface of the cover plate 201 is provided with a through hole. The connecting bolt 402 fixes the cover plate 201 and the top plate 403 through its own outer arc thread. The lower movable end of the electric push rod 404 is fixedly connected to the baffle plate 207. When the upper pressure of the filter 203 is too large, the electric push rod 404 will receive the signal of the pressure sensor 406, and then extend to drive the movable sleeve 208 to move downward as a whole. The outer surface of the detection probe 405 is fixedly connected to the cover plate 201, and the outer arc surface of the fixed end of the electric push rod 404 is fixedly connected to the cover plate 201.

[0040] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An injection molding machine oil circuit cleaning mechanism, comprising a frame body (1), an oil tank (5), and an injection molding machine (6), characterized in that: A filter device (2) is provided on the front surface of the frame body (1); an oil tank (5) is fixedly connected to the upper left side of the frame body (1); an injection molding machine (6) is provided on the upper part of the frame body (1); and an oil tank fixing device (3) is provided on the outer side of the oil tank (5); the filter device (2) comprises a filter (203); a cover plate (201) is fixedly connected to the upper end of the filter (203); an oil outlet (202) is provided on the left side of the upper part of the outer arc surface of the filter (203); an oil inlet (204) is provided on the right side of the upper part of the outer arc surface of the filter (203); and a shielding plate is slidably connected to the upper part of the inner arc surface of the filter (203). (207), a movable sleeve (208) is fixedly connected to the inner arc surface of the baffle plate (207), a filter paper (209) is clamped on the lower surface of the movable sleeve (208), an oil return port (211) is opened at the lower end of the filter (203), a rotating shaft (205) is rotatably connected to the lower part of the inner arc surface of the filter (203), an impeller (206) is fixedly connected to the upper part of the outer arc surface of the rotating shaft (205), a cleaning rod (210) is fixedly connected to the lower part of the outer arc surface of the rotating shaft (205), a three-way joint (212) is fixedly connected to the lower part of the filter (203), and a pressure detection device (4) is arranged on the upper part of the filter (203).

2. The oil circuit cleaning mechanism for an injection molding machine according to claim 1, characterized in that: The oil tank fixing device (3) comprises a support plate (303), a stopper (305) is fixedly connected to the front portion of the upper surface of the support plate (303), a connecting block (304) is fixedly connected to the upper surface of the support plate (303), an inner surface of the connecting block (304) is rotatably connected to a hinge shaft (306), a piston plate (308) is fixedly connected to the middle portion of the outer arc surface of the hinge shaft (306), a damping chamber (307) is connected to the piston in the middle portion of the outer arc surface of the hinge shaft (306), both ends of the hinge shaft (306) are fixedly connected to elastic telescopic rods (302), and the upper portion of the elastic telescopic rod (302) is hinged with a clamping ring (301).

3. The oil circuit cleaning mechanism for an injection molding machine according to claim 1, characterized in that: The pressure detection device (4) comprises a top plate (403), a pressure sensor (406) is fixedly connected to the upper surface of the top plate (403), a warning light bar (401) is fixedly connected to the outer arc surface of the pressure sensor (406), a connecting bolt (402) is threadedly connected to the inner surface of the top plate (403), an electric push rod (404) is fixedly connected to the lower surface of the top plate (403), and a detection probe (405) is fixedly connected to the lower end of the pressure sensor (406).

4. The oil circuit cleaning mechanism for an injection molding machine according to claim 1, characterized in that: A circular protrusion is provided at the lower part of the inner arc surface of the filter (203), a filter paper clip is provided at the upper surface of the circular protrusion at the lower part of the inner arc surface of the filter (203), and a plurality of groups of threaded through holes are provided on the inner surface of the cover plate (201).

5. The oil circuit cleaning mechanism for an injection molding machine according to claim 1, characterized in that: The oil outlet (202) and the oil inlet (204) are symmetrically distributed with the center line of the filter (203) as the symmetry axis, and the baffle plate (207) is arranged to be inclined as a whole, the left side of the baffle plate (207) is higher than the upper edge of the oil outlet (202), and the right side of the baffle plate (207) is lower than the lower edge of the oil inlet (204), a through hole is opened at the center of the inner surface of the baffle plate (207), and a filter paper clip is arranged at the lower surface of the movable sleeve (208).

6. The oil circuit cleaning mechanism for an injection molding machine according to claim 1, characterized in that: The oil return port (211) is connected to the three-way joint (212) at the bottom, the upper end of the rotating shaft (205) is rotatably connected to the cover plate (201), a plurality of groups of inclined arc-shaped blades are arranged on the outer arc surface of the impeller (206), the height of the impeller (206) is lower than the upper edge of the movable sleeve (208), and the outer arc surface of the cleaning rod (210) is in contact with the filter paper (209).

7. The oil circuit cleaning mechanism for an injection molding machine according to claim 2, characterized in that: The support plate (303) is provided with a through hole in the lower area of ​​the oil tank (5); the end of the support plate (303) away from the oil tank (5) is fixedly connected to the frame body (1); the block (305) is arranged in an arc shape as a whole; the inner arc surface of the block (305) contacts the oil tank (5); a through hole is provided at the center of the inner surface of the connecting block (304); the outer arc surface of the piston plate (308) is connected to the piston of the damping chamber (307); the inner surface of the piston plate (308) is provided with multiple groups of through holes; and the damping chamber (307) stores damping fluid inside.

8. The oil circuit cleaning mechanism for an injection molding machine according to claim 2, characterized in that: The damping chamber (307) is provided with through holes at both the front and rear ends, the lower end of the damping chamber (307) is fixedly connected to the support plate (303), the lower end of the elastic telescopic rod (302) is provided with a through hole, the clamping ring (301) is made of plastic material, and the curvature of the inner arc surface of the clamping ring (301) is the same as the curvature of the outer arc surface of the oil tank (5).

9. The oil circuit cleaning mechanism for an injection molding machine according to claim 3, characterized in that: The inner surface of the top plate (403) is provided with a plurality of groups of threaded through holes, the lower surface of the top plate (403) contacts the cover plate (201), a through hole is provided at the center of the inner surface of the cover plate (201), and a through hole is provided on the inner surface of the cover plate (201), and the connecting bolt (402) is fixedly connected to the cover plate (201) and the top plate (403) through its own outer arc surface thread.

10. The oil circuit cleaning mechanism for an injection molding machine according to claim 3, characterized in that: The lower movable end of the electric push rod (404) is fixedly connected to the shielding plate (207), the outer surface of the detection probe (405) is fixedly connected to the cover plate (201), and the outer arc surface of the fixed end of the electric push rod (404) is fixedly connected to the cover plate (201).

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