Automatic slicing equipment for rubber diaphragm processing

Abstract

The invention relates to the technical field of rubber processing, and particularly discloses an automatic slicing device for rubber diaphragm processing, the automatic slicing device comprises a workbench, a first vertical plate and a second vertical plate, the middle of the upper surface of the workbench is open so that a rubber diaphragm can fall down, and the first vertical plate and the second vertical plate are fixedly connected to the left side and the right side of the upper surface of the workbench respectively; the device further comprises a supporting roller, a motor, a driving roller, a rubber belt, a slicing mechanism and a lubricating mechanism. The supporting roller can be installed in the middle of the first vertical plate through a bearing and can rotate around the axis of the supporting roller. The motor is installed in the middle of the rear side of the second vertical plate. The rubber belt positioning function is achieved, displacement of the rubber belt during cutting is prevented, the yield is improved, the typesetting function is achieved, the superficial area of the rubber belt is fully utilized, waste of the rubber belt is prevented, the production cost is saved, the cutter lubricating function is achieved, the friction coefficient with the rubber belt is reduced, the service life of the cutter is prolonged, and the product quality is improved.

Description

Technical Field

[0001] The invention relates to the technical field of rubber processing, in particular to automatic slicing equipment for processing rubber diaphragms. Background Art

[0002] Rubber diaphragms are usually round and are mainly used in valves, regulating valves, automatic mechanical follow-up devices, switches and counters for flow, pressure, differential, liquid level, constant temperature volume thermal compensation, etc. Its advantages are high working reliability, good composite properties, long working life and low cost. In order to prevent the slicing knife from being blunted, the invention with publication number CN113023454A discloses an automatic slicing device for rubber diaphragm processing, including a base, a feeding mechanism, a slicing mechanism and a driving mechanism. The feeding mechanism includes a first guide roller and a second guide roller rotatably mounted on the base, and a strip of rubber blank is wound between the first guide roller and the second guide roller; the slicing mechanism includes an upper knife plate, a lower bottom plate and a lifting assembly, and the lifting assembly is used to drive the upper knife plate to move reciprocatingly up and down. The above-mentioned equipment cuts out rubber diaphragms on the rubber blank by lowering the slicing knife. However, the rubber blank cannot be positioned during slicing, and displacement will occur during cutting of the rubber blank, resulting in deformation of the rubber diaphragm and a decrease in the yield rate. The slicing knife is installed and fixed by the mutual cooperation of the first clamping block, the second clamping block and the first elastic member, and rubber diaphragms of different sizes can be produced. However, the spacing between the slicing knives cannot be changed, resulting in unreasonable layout of the slicing knives and an increase in the scraps of the rubber blank. In addition, due to the large friction generated when the slicing knife contacts the rubber blank, the edge of the rubber blank is rough after molding, the molding quality is poor, and the slicing knife is greatly damaged. Therefore, it is necessary to propose an automatic slicing equipment for rubber diaphragm processing with good molding effect. Summary of the invention

[0003] The invention provides an automatic slicing device for processing a rubber diaphragm, aiming to solve the existing problems that the rubber blank cannot be positioned, the surface area of ​​the rubber blank cannot be fully utilized, and the slicing knife cannot be lubricated.

[0004] The present invention achieves the above-mentioned purpose through the following technical scheme: an automatic slicing device for rubber diaphragm processing, including a workbench, a first vertical plate and a second vertical plate. The middle part of the upper surface of the workbench is open to facilitate the falling of the rubber diaphragm. The first vertical plate and the second vertical plate are respectively fixedly connected to the left and right sides of the upper surface of the workbench. The present invention also includes a supporting roller, a motor, a driving roller, a rubber belt, a slicing mechanism and a lubricating mechanism. The supporting roller is installed in the middle of the first vertical plate so as to be rotatable around its own axis through a bearing; the motor is installed in the middle of the rear side of the second vertical plate; the driving roller is installed at the output end of the motor; the rubber belt is wound around the outer walls of the supporting roller and the driving roller, and the driving roller is rotated under the drive of the motor to achieve a winding effect on the rubber belt; the slicing mechanism is fixedly connected between the first vertical plate and the second vertical plate; the lubricating mechanism is fixedly connected to the middle of the rear side of the upper surface of the workbench.

[0005] Specifically, the slicing mechanism includes a top plate, a first cylinder, a lifting plate, a positioning assembly and a cutting assembly. The top plate is fixedly connected between the first vertical plate and the second vertical plate; there are two first cylinders, which are respectively installed on the left and right sides of the upper surface of the top plate; the lifting plate is installed at the output end of the first cylinder; there are two positioning assemblies, which are respectively arranged on the left and right sides of the lifting plate, and the rubber belt is pressed against the upper surface of the workbench through the positioning assembly; the cutting assembly is fixedly connected to the center position of the lower surface of the lifting plate, and the rubber belt is cut into rubber membranes through the cutting assembly.

[0006] Specifically, the purpose is to position the rubber belt, and the positioning assembly includes a sliding rod, a limit block, a spring and a pressure plate. There are two sliding rods, which are respectively inserted into the front and rear sides of the lifting plate; the limit block is installed at the top of the sliding rod; the spring is sleeved on the outer wall of the sliding rod; the pressure plate is fixedly connected to the bottom end of the sliding rod, and the pressure plate is pushed downward under the action of the spring elastic force.

[0007] Specifically, the bottom of the pressing plate is provided with anti-slip edges.

[0008] Specifically, the purpose is to cut the rubber belt and be able to layout according to the cutter size. The cutting assembly includes a box body, a guide rod, a second cylinder, a telescopic connecting rod frame, a slider, a mounting seat and a cutter. The box body is fixedly connected to the center position of the lower surface of the lifting plate; the guide rod is horizontally installed at the bottom of the inner cavity of the box body; the second cylinder is horizontally installed on the right inner wall of the box body; one end of the telescopic connecting rod frame is connected to the output end of the second cylinder through a pin, and the other end is connected to the left inner wall of the box body through a pin; there are several sliders, which are equidistantly sleeved on the outer wall of the guide rod from left to right, and the top of the slider is connected to the telescopic connecting rod frame through a pin; the mounting seat is fixedly connected to the bottom of the slider, and the outer wall of the mounting seat is provided with a thread; the cutter is screwed to the outer wall of the mounting seat, and the rubber belt is cut into rubber membranes by the cutter.

[0009] Specifically, the intersection point at the center position of the connecting rod of the telescopic connecting rod frame is connected to the sliding block.

[0010] Specifically, the purpose is to lubricate the cutter and reduce the friction when the cutter cuts the rubber belt. The lubrication mechanism includes a base, a frame, a third cylinder, a support seat, a lifting rod, a cleaning box, a guide wheel, a liquid level monitoring component, an ultrasonic transducer and an alarm. The base is fixedly connected to the center position of the rear side of the upper surface of the workbench; the frame is fixedly connected to the top of the base, and slideways are provided on the left and right sides of the frame; there are two third cylinders, which are respectively installed at the left and right ends of the rear side of the frame; the support seat is installed at the output end of the third cylinder, and the front of the support seat is driven by the third cylinder rear movement; there are two lifting rods, which are respectively vertically installed on the left and right sides of the support seat; a cleaning box is installed on the output end of the lifting rod, and lubricant is stored in the cleaning box; there are two guide wheels, which are respectively installed on the left and right rear ends of the cleaning box, and the guide wheels are plugged into the inner cavity of the slide; the liquid level monitoring component is vertically installed on the inner wall of the cleaning box; there are two ultrasonic transducers, which are respectively installed on the front and back sides of the cleaning box, and the ultrasonic transducers are externally connected to an ultrasonic generator; the alarm is installed on the right side wall of the frame, and the alarm is electrically connected to the liquid level monitoring component.

[0011] Specifically, the front side of the slideway is inclined upward.

[0012] Specifically, the length of the cleaning box is greater than the maximum distance between the cutters.

[0013] Specifically, the liquid level monitoring assembly includes a limit sleeve, a proximity switch, a stop rod and a float. The limit sleeve is vertically installed on the inner wall of the cleaning box; the proximity switch is installed on the top of the outer wall of the limit sleeve, and the proximity switch is electrically connected to the alarm; the stop rod can be slid up and down and inserted into the inner cavity of the limit sleeve; the float is installed at the bottom end of the stop rod, and the float floats on the lubricant liquid surface under the action of its own buoyancy.

[0014] The beneficial effects of the present invention are: 1. The present invention drives the lifting plate downward by the first cylinder. When the slide rod contacts the rubber belt, sliding occurs between the slide rod and the lifting plate. The spring force allows the pressure plate to press the rubber belt against the workbench. When the cutter descends, the rubber belt is cut. The rubber belt has a positioning function to prevent the rubber belt from shifting during cutting, thereby improving the yield rate.

[0015] 2. The present invention extends or shortens the telescopic connecting rod frame by pulling the second cylinder, pulls the slider to move on the guide rod, increases or decreases the distance between two adjacent sliders, changes the distance between the cutters, has a typesetting function, makes full use of the surface area of ​​the rubber belt, prevents waste of the rubber belt, and saves production costs.

[0016] 3. The present invention drives the support seat forward by the third cylinder, and the cleaning box moves to the bottom of the cutter under the cooperation of the slide and the guide wheel. The cutter is immersed in the lubricant, and the ultrasonic transducer releases ultrasonic waves into the lubricant to remove impurities on the surface of the cutter before lubrication, thereby improving the lubrication effect of the cutter. The float can drop as the volume of the lubricant decreases. When the barrier rod drops and no longer blocks the proximity switch, the proximity switch causes the alarm to sound an alarm, indicating that the lubricant in the cleaning box is too small and the cutter cannot be lubricated. Therefore, it has the function of lubricating the cutter, reduces the friction coefficient with the rubber belt, extends the use time of the cutter, and improves product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the present invention.

[0018] Figure 2 It is a front cross-sectional view of the slicing mechanism of the present invention.

[0019] Figure 3 It is a schematic diagram of the structure of the positioning component and the cutting component of the present invention.

[0020] Figure 4 It is a top view of the telescopic connecting rod frame of the present invention.

[0021] Figure 5 It is a schematic diagram of the structure of the lubrication mechanism of the present invention.

[0022] Figure 6 It is a right side cross-sectional view of the lubrication mechanism of the present invention.

[0023] Figure 7 It is a schematic diagram of the structure of the liquid level monitoring component of the present invention.

[0024] In the figure: 1, workbench; 2, first vertical plate; 3, second vertical plate; 4, support roller; 5, motor; 6, drive roller; 7, rubber belt; 8, slicing mechanism; 9, lubrication mechanism; 81, top plate; 82, first cylinder; 83, lifting plate; 84, positioning assembly; 85, cutting assembly; 841, slide bar; 842, limit block; 843, spring; 844, pressure plate; 851, box body; 852, guide rod; 853, second cylinder Cylinder; 854, telescopic connecting rod frame; 855, slider; 856, mounting seat; 857, cutter; 91, base; 92, frame; 93, slide; 94, third cylinder; 95, support seat; 96, lifting rod; 97, cleaning box; 98, guide wheel; 99, liquid level monitoring component; 910, ultrasonic transducer; 911, alarm; 991, limit sleeve; 992, proximity switch; 993, stop rod; 994, float. DETAILED DESCRIPTION

[0025] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the preferred embodiments of the present invention are further described below in conjunction with specific implementation methods and accompanying drawings.

[0026] See also Figure 1-Figure 7 The present invention provides an automatic slicing device for processing a rubber diaphragm, comprising a workbench 1, a first vertical plate 2 and a second vertical plate 3. The center position of the upper surface of the workbench 1 is hollow, the first vertical plate 2 and the second vertical plate 3 are respectively fixedly connected to the left and right ends of the upper surface of the workbench 1, a support roller 4 capable of rotating around its own axis is installed through a bearing in the middle of the first vertical plate 2, a motor 5 is installed in the middle of the rear side of the second vertical plate 3, a driving roller 6 is installed at the output end of the motor 5, a rubber belt 7 is wound around the driving roller 6 and the supporting roller 4, and the driving roller 6 can reel the rubber belt 7 under the drive of the motor 5, a slicing mechanism 8 is fixedly connected between the first vertical plate 2 and the second vertical plate 3, and a lubrication mechanism 9 is fixedly connected to the center position of the rear side of the upper surface of the workbench 1.

[0027] As a preferred embodiment, further, the slicing mechanism 8 includes a top plate 81 fixedly connected between the first vertical plate 2 and the second vertical plate 3, the first cylinder 82 is installed on both sides of the upper surface of the top plate 81, a lifting plate 83 is installed on the output end of the first cylinder 82, and positioning components 84 are arranged on both sides of the lifting plate 83. A cutting component 85 is fixedly connected to the center position of the lower surface of the lifting plate 83. The lifting plate 83 can be driven by the first cylinder 82 to descend, so that the positioning component 84 presses the rubber belt 7 against the upper surface of the workbench 1, and the cutting component 85 can cut the rubber belt 7 when it descends.

[0028] As a preferred solution, further, the positioning assembly 84 includes a sliding rod 841 vertically inserted on the front and rear sides of the lifting plate 83, and a limit block 842 is installed on the top of the sliding rod 841. The limit block 842 can prevent the sliding rod 841 from detaching from the lifting plate 83. The outer wall of the sliding rod 841 is sleeved with a spring 843, and the bottom end of the sliding rod 841 is fixedly connected with a pressure plate 844. Under the action of the elastic force of the spring 843, the pressure plate 844 is pushed downward. The bottom of the pressure plate 844 is provided with an anti-slip edge to increase the friction force when the pressure plate 844 presses down the rubber belt 7, thereby preventing displacement when the rubber belt 7 is cut.

[0029] As a preferred embodiment, further, the cutting assembly 85 includes a box body 851 fixedly connected to the center position of the lower surface of the lifting plate 83, a guide rod 852 is horizontally installed at the bottom of the inner cavity of the box body 851, and a second cylinder 853 is horizontally installed on the right inner wall of the box body 851. The output end of the second cylinder 853 is connected to one end of a telescopic connecting rod frame 854 through a pin shaft, and the other end of the telescopic connecting rod frame 854 is connected to the left inner wall of the box body 851 through a pin shaft. The telescopic connecting rod frame 854 is extended or shortened by the second cylinder 853, and the outer wall of the guide rod 852 is moved from A plurality of sliders 855 are sleeved from left to right, and the slider 855 is connected to the telescopic link frame 854 through a pin shaft. A mounting seat 856 is installed at the bottom of the slider 855, and a thread is set on the outer wall of the mounting seat 856. A ring-shaped cutter 857 is screwed on the outer wall of the mounting seat 856. The cutter 857 is moved downward to cut the rubber belt 7 into rubber membranes. The intersection point of the center position of the link of the telescopic link frame 854 is connected to the slider 855. When the telescopic link frame 854 is extended or retracted, the distance between two adjacent sliders 855 can be enlarged or reduced.

[0030] As a preferred solution, further, the lubrication mechanism 9 includes a base 91 fixedly connected to the center position of the rear side of the upper surface of the workbench 1, a frame 92 is fixedly connected to the top of the base 91, and slideways 93 are provided on the left and right sides of the frame 92. A third cylinder 94 is installed on both ends of the left and right sides of the rear side of the frame 92, and a support seat 95 is installed on the output end of the third cylinder 94. The left and right sides of the support seat 95 are plugged with lifting rods 96 that can slide up and down, and a cleaning box 97 is installed on the top of the lifting rod 96. Lubricant is stored in the cleaning box 97. The support seat 95 can be moved forward and backward under the drive of the third cylinder 94, and then the cleaning box 97 can be moved toward the cutter 857 for cleaning. Guide wheels 98 plugged into the inner cavity of the slide 93 are installed at the rear ends of the left and right sides of the box 97. The front end of the slide 93 is inclined upward. When the cleaning box 97 moves forward, the guide wheels 98 move upward under the action of the inclined surface of the slide 93, so that the cleaning box 97 can rise. A liquid level monitoring component 99 is vertically installed on the inner wall of the cleaning box 97. Ultrasonic transducers 910 are installed on the front and back sides of the cleaning box 97. The ultrasonic transducer 910 is externally connected to an ultrasonic generator. The ultrasonic transducer 910 releases ultrasonic waves to the lubricant. The ultrasonic waves cause the lubricant to vibrate and generate energy, allowing the lubricant to remove the rubber material on the surface of the cutter 857. An alarm 911 is installed on the right side wall of the frame 92.

[0031] As a preferred solution, further, the liquid level monitoring component 99 includes a limit sleeve 991 vertically installed on the inner wall of the cleaning box 97, a proximity switch 992 electrically connected to the alarm 911 is installed on the top of the outer wall of the limit sleeve 991, a baffle rod 993 that can slide up and down is inserted into the inner cavity of the limit sleeve 991, and a float ball 994 is installed at the bottom of the baffle rod 993. The float ball 994 can float on the lubricant liquid surface under the action of its own buoyancy.

[0032] Working principle: Step 1: Driven by the motor 5, the driving roller 6 reels the rubber belt 7, and the rubber belt 7 moves from left to right. The lifting plate 83 is driven down by the first cylinder 82. When the pressing plate 844 contacts the rubber belt 7, the sliding rod 841 slides between the lifting plate 83, and the spring 843 presses the pressing plate 844 downward. The pressing plate 844 presses the rubber belt 7 tightly against the upper surface of the common workbench 1. Then the lifting plate 83 continues to descend, and the cutter 857 cuts the rubber belt 7 into rubber membranes. Then the first cylinder 82 drives the lifting plate 83 to move upward to prepare for cutting again, thereby realizing automatic cutting of the rubber membranes. Step 2: When the cutter 857 needs to be lubricated, the support seat 95 is driven forward by the third cylinder 94, and the guide wheel 98 rolls in the slideway 93. The front inclined surface of the slideway 93 can squeeze the guide wheel 98 upward. Under the condition that the lifting rod 96 limits the cleaning box 97, the guide wheel 98 drives the cleaning box 97 to move upward, so that the cutter 857 is immersed in the lubricant. The ultrasonic transducer 910 releases ultrasonic waves into the lubricant, and the lubricant cleans the cutter 857, allowing the lubricant to directly act on the surface of the cutter 857. Then, the third cylinder 94 pulls the support seat 95 backward, and the cleaning box 97 withdraws, completing the lubrication of the cutter 857. The float 994 floats on the lubricant surface by its own buoyancy. As the cutter 857 uses the lubricant, the lubricant is continuously reduced, and the float 994 gradually drops. When the stopper 993 drops and no longer blocks the proximity switch 992, the proximity switch 992 energizes the alarm 911 and sounds, alerting the staff that the lubricant is insufficient. Step three, when the cutting diameter needs to be changed, the telescopic connecting rod frame 854 is driven to extend or shorten by the second cylinder 853, and the telescopic connecting rod frame 854 pulls the slider 855 to slide on the outer wall of the guide rod 852, and the distance between two adjacent sliders 855 becomes larger or smaller. After adjusting the distance between the sliders 855, the corresponding size cutter 857 is replaced to complete the replacement of the cutter 857, so as to make full use of the area of ​​the rubber belt 7 and expand the cutting output of the rubber diaphragm.

[0033] The technical features of the above embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

Claims

1. An automatic slicing device for processing a rubber diaphragm, comprising a workbench (1), a first vertical plate (2) and a second vertical plate (3), wherein the middle portion of the upper surface of the workbench (1) is open to facilitate the falling of the rubber diaphragm, and the first vertical plate (2) and the second vertical plate (3) are respectively fixedly connected to the left and right sides of the upper surface of the workbench (1), characterized in that: The automatic slicing equipment for processing rubber diaphragms also includes: A support roller (4) is mounted in the middle of the first vertical plate (2) via a bearing so as to be rotatable about its own axis; A motor (5) is mounted on the middle portion of the rear side of the second vertical plate (3); A driving roller (6) mounted on the output end of the motor (5); The rubber belt (7) is wound around the outer walls of the supporting roller (4) and the driving roller (6), and the driving roller (6) is rotated under the drive of the motor (5), thereby achieving a winding effect on the rubber belt (7); A slicing mechanism (8) fixedly connected between the first vertical plate (2) and the second vertical plate (3); A lubrication mechanism (9) fixedly connected to the middle portion of the rear side of the upper surface of the workbench (1); The slicing mechanism (8) comprises: A top plate (81) fixedly connected between the first vertical plate (2) and the second vertical plate (3); Two first cylinders (82) are installed on the left and right sides of the upper surface of the top plate (81) respectively; A lifting plate (83) mounted on the output end of the first cylinder (82); Two positioning components (84) are respectively arranged on the left and right sides of the lifting plate (83), and the rubber belt (7) is pressed against the upper surface of the workbench (1) by the positioning components (84); A cutting assembly (85) is fixedly connected to the center position of the lower surface of the lifting plate (83), and the rubber belt (7) is cut into rubber membrane sheets by the cutting assembly (85).

2. The automatic slicing equipment for rubber diaphragm processing according to claim 1, characterized in that: The positioning component (84) comprises: Two sliding rods (841) are respectively inserted into the front and rear sides of the lifting plate (83); A limit block (842) is installed on the top of the slide bar (841); A spring (843) sleeved on the outer wall of the slide rod (841); The pressing plate (844) is fixedly connected to the bottom end of the sliding rod (841), and is pushed downward by the elastic force of the spring (843).

3. The automatic slicing equipment for rubber diaphragm processing according to claim 2, characterized in that: The bottom of the pressing plate (844) is provided with an anti-slip edge.

4. The automatic slicing equipment for rubber diaphragm processing according to claim 3, characterized in that: The cutting component (85) comprises: The box body (851) is fixedly connected to the center position of the lower surface of the lifting plate (83); A guide rod (852) is transversely mounted on the bottom of the inner cavity of the box body (851); A second cylinder (853) is transversely mounted on the right inner wall of the box body (851); A telescopic connecting rod frame (854), one end of which is connected to the output end of the second cylinder (853) via a pin, and the other end of which is connected to the left inner wall of the box body (851) via a pin; There are a plurality of sliders (855) which are sleeved on the outer wall of the guide rod (852) at equal distances from left to right, and the top of the slider (855) is connected to the telescopic connecting rod frame (854) via a pin shaft; A mounting seat (856) fixedly connected to the bottom of the sliding block (855), and the outer wall of the mounting seat (856) is provided with threads; A cutter (857) is screwed onto the outer wall of the mounting seat (856), and the rubber band (7) is cut into rubber diaphragms by the cutter (857).

5. The automatic slicing equipment for processing rubber diaphragms according to claim 4, characterized in that: The cross point at the center position of the connecting rod of the telescopic connecting rod frame (854) is connected to the sliding block (855).

6. The automatic slicing equipment for processing rubber diaphragms according to claim 5, characterized in that: The lubrication mechanism (9) comprises: A base (91) is fixedly connected to a rear center position of an upper surface of the workbench (1); A frame (92) is fixedly connected to the top of the base (91), and slideways (93) are provided on both left and right sides of the frame (92); Two third cylinders (94) are installed at the left and right ends of the rear side of the frame (92) respectively; A support seat (95) is installed at the output end of the third cylinder (94), and the support seat (95) is driven to move forward and backward by the third cylinder (94); Two lifting rods (96) are respectively vertically mounted on the left and right sides of the support seat (95); A cleaning box (97) is installed at the output end of the lifting rod (96), and lubricant is stored in the cleaning box (97); Two guide wheels (98) are respectively installed at the rear ends of the left and right sides of the cleaning box (97), and the guide wheels (98) are plugged into the inner cavity of the slideway (93); A liquid level monitoring assembly (99) vertically mounted on the inner wall of the cleaning tank (97); Two ultrasonic transducers (910) are installed on the front and rear sides of the cleaning box (97) respectively, and the ultrasonic transducers (910) are externally connected to an ultrasonic generator; An alarm (911) is installed on the right side wall of the frame (92), and the alarm (911) is electrically connected to the liquid level monitoring component (99).

7. The automatic slicing equipment for processing rubber diaphragms according to claim 6, characterized in that: The front side of the slideway (93) is inclined upward.

8. The automatic slicing equipment for processing rubber diaphragms according to claim 7, characterized in that: The length of the cleaning box (97) is greater than the maximum distance between the cutters (857).

9. The automatic slicing equipment for processing rubber diaphragms according to claim 8, characterized in that: The liquid level monitoring component (99) comprises: A limiting sleeve (991) is vertically mounted on the inner wall of the cleaning box (97); A proximity switch (992) is installed on the top of the outer wall of the limiting sleeve (991), and the proximity switch (992) is electrically connected to the alarm (911); A stop rod (993) is inserted into the inner cavity of the limiting sleeve (991) so as to be slidable up and down; The float ball (994) is installed at the bottom end of the blocking rod (993), and the float ball (994) floats on the lubricant liquid surface under the action of its own buoyancy.

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