CN214731900U

CN214731900U - Alarm mechanism of scraper conveyor driving device for mining coal in mine

Info

Publication number: CN214731900U
Application number: CN202121044835.9U
Authority: CN
Inventors: 郝宇
Original assignee: Chongqing Vocational Institute of Engineering
Current assignee: Chongqing Vocational Institute of Engineering
Priority date: 2021-05-17
Filing date: 2021-05-17
Publication date: 2021-11-16
Anticipated expiration: 2031-05-17

Abstract

The utility model provides a mine is adopted coal with scraper conveyor drive arrangement's alarm mechanism, including the alarm, the alarm includes piston cylinder, shrouding, piston, bracing piece, kicking block, box body, normally closed switch and alarm lamp. The utility model discloses a scraper conveyor drive arrangement's for coal mining in mine alarm mechanism, accomplish automatic shutdown when lubricated bad or lack of oil, can avoid causing inside gear of speed reducer and high-speed shaft bearing to take place to scatter, lock the trouble and influence normal production, further avoid causing the manpower, material resources are extravagant and great economic loss, adopt controller and flowmeter control motor to open automatically and stop to cause high-speed shaft bearing and gear to take place to scatter in order to solve the inside lubricated chamber of speed reducer in the lubricated chamber, the problem of locking the trouble is said, this scheme, it is safer, stable, reliable, be particularly useful for the colliery to use, can stop the potential safety hazard because of the controller often breaks down.

Description

Alarm mechanism of scraper conveyor driving device for mining coal in mine

Technical Field

The utility model relates to a coal mine machinery technical field especially relates to a mine is mined with scraper conveyor drive arrangement's alarm mechanism.

Background

Coal mines are areas where humans mine coal resources in coal-rich mining areas, and are generally divided into underground coal mines and opencast coal mines. When the coal seam is far from the ground surface, a tunnel is usually dug to the underground, so that the coal is a mineworker coal mine. When the coal seam is very close to the earth surface, the coal is generally excavated by directly stripping the earth surface, which is an open pit coal mine. The vast majority of coal mines in China belong to underground coal mines. Coal mines encompass a large area above ground and below ground as well as associated facilities. Coal mines are reasonable spaces excavated by humans when excavating geological formations rich in coal and generally include roadways, wells, and mining surfaces, among others. Coal is the most predominant solid fuel, one of the flammable organic rocks. It is formed by that the flourishing plants grown in a certain geologic age are gradually piled up into a thick layer in a proper geologic environment, and are buried in the water bottom or silt, and then are subjected to the natural coalification action in a long geologic age.

In the prior art, a scraper conveyor driving device for mine coal mining generally comprises an alarm mechanism, a lubricating mechanism, a motor and a speed reducer, wherein the lubricating mechanism is used for lubricating a gear and a high-speed shaft bearing inside the speed reducer, and the alarm mechanism is used for giving an alarm to prompt a worker to timely handle an oil shortage fault when the speed reducer is in an oil shortage state The problem that normal production is influenced by locking faults occurs, and further manpower and material resources are wasted and great economic loss is caused.

Therefore, the alarm mechanism of the driving device of the scraper conveyor for mining coal in the mine with the lubricating function is provided.

SUMMERY OF THE UTILITY MODEL

In view of the above prior art's shortcoming, the utility model aims to provide a mine is adopted scraper conveyor drive arrangement's alarm mechanism for coal mining for solve among the prior art mine and adopt the problem that the technical scheme that coal mining scraper conveyor drive arrangement's alarm mechanism realized the warning purpose exists.

In order to achieve the above objects and other related objects, the utility model provides a mine is adopted coal and is used scraper conveyor drive arrangement's alarm mechanism, mine is adopted coal and is used scraper conveyor drive arrangement's alarm mechanism includes: the alarm comprises a piston cylinder, a sealing plate, a piston, a supporting rod, a top block, a box body, a normally closed switch and an alarm lamp, wherein the bottom end of the piston cylinder is a closed end, the upper end of the piston cylinder is an open end, the sealing plate is fixedly and hermetically installed at the upper end of the piston cylinder, the piston is slidably installed inside the piston cylinder, the supporting rod is movably installed at the central position of the sealing plate, the bottom end of the supporting rod is fixedly connected with the upper central position of the piston, the top block is fixedly installed at the upper end part of the supporting rod, the box body is fixedly installed at the side part of the piston cylinder through a v-21274, a shape support is fixedly installed at the upper end of the piston cylinder, the box body is located above the upper end of the piston cylinder, the normally closed switch is embedded on the bottom wall of the box body, the normally closed switch is matched with the top block, and the alarm lamp is fixedly installed at the top of the box body, and the alarm lamp is connected with the normally closed switch in series.

Preferably, the alarm further comprises a buzzer, the buzzer is fixedly mounted inside the box body, and the buzzer is connected with the normally closed switch in series.

Preferably, the alarm lamp is fixedly installed at the top of the box body through a vertical rod.

Preferably, the alarm further comprises a first connecting pipe, the first connecting pipe is fixedly installed at the bottom end of the piston cylinder, and the first connecting pipe is communicated with the inside of the piston cylinder.

Preferably, the alarm further comprises a second connecting pipe, the second connecting pipe is fixedly installed on the side portion of the piston cylinder, and the second connecting pipe is communicated with the interior of the piston cylinder.

Preferably, the alarm further comprises a one-way valve, the one-way valve is fixedly mounted on the second connecting pipe, and the conduction direction of the one-way valve is back to the piston cylinder.

Preferably, when the piston is in the jacking state, the bottom of the piston is higher than the communication position of the second connecting pipe and the piston cylinder.

Preferably, the piston cylinder is a stainless steel piston cylinder, and the roughness of the inner surface of the piston cylinder and the roughness of the surface of the piston are not greater than Ra0.1.

Preferably, the alarm further comprises a normally open switch, the normally open switch is embedded on the bottom wall of the box body, the normally open switch is matched with the top block, and the normally open switch and the normally closed switch are arranged side by side.

Preferably, the normally closed switch is in an open circuit state when the top block tightly pushes the normally closed switch, and the normally open switch is in an open circuit state when the top block tightly pushes the normally open switch.

As above, the utility model discloses a scraper conveyor drive arrangement's for coal mining alarm mechanism has following beneficial effect at least:

the utility model discloses, the mine of design is adopted scraper conveyor drive arrangement's for coal mining alarm mechanism mainly by the piston cylinder, the shrouding, the piston, the bracing piece, the kicking block, a box bod, the normally closed switch, the alarm lamp, first connecting pipe, the second connecting pipe, bee calling organ and normally open switch constitute, can show whether normally carry lubricating oil in real time, can report to the police when the lack of oil, make the staff can know the lubricated condition of speed reducer high-speed shaft bearing in real time, accomplish automatic shutdown when lubricated bad or lack of oil, can avoid causing speed reducer internal gear and high-speed shaft bearing to take place to scatter the frame, the jam trouble and influence normal production, further avoid causing the manpower, material resources are extravagant and great economic loss, just guarantee just that the motor just can open under the sufficient state of speed reducer lubricating oil under the state of lubricating mechanism normal work simultaneously, adopt controller and flowmeter control motor automatic open to open and stop to make oil shortage in order to solve the inside lubricated chamber of speed reducer for prior art The problem that the high-speed shaft bearing and the gear are subjected to frame scattering and locking faults is solved, and the scheme is safer, more stable and more reliable, is particularly suitable for coal mines, and can avoid potential safety hazards caused by frequent faults of the controller.

Drawings

Fig. 1 shows one of the structural schematic diagrams of the alarm mechanism of the driving device of the scraper conveyor for coal mining in the mine.

Fig. 2 is a schematic structural diagram of another view angle of the alarm mechanism of the scraper conveyor driving device for coal mining in a mine.

Fig. 3 is a schematic cross-sectional view of the alarm mechanism of the scraper conveyor driving device for coal mining in the mine.

Fig. 4 shows the working principle circuit diagram of the buzzer, the alarm lamp and the normally closed switch of the alarm mechanism of the scraper conveyor driving device for coal mining in the mine.

Fig. 5 is a circuit diagram showing the working principle of the normally open switch of the alarm mechanism of the scraper conveyor driving device for mine coal mining and the motor of the scraper conveyor driving device for mine coal mining according to the present invention.

Description of the element reference numerals

1. An alarm; 101. a piston cylinder; 102. a piston; 103. closing the plate; 104. a support bar; 105. a top block; 106. a buzzer; 107. erecting a rod; 108. an alarm lamp; 109. a normally closed switch; 110. \ 21274and a bracket; 111. a box body; 112. a normally open switch; 113. a first connecting pipe; 114. a second connecting pipe; 115. a one-way valve.

Detailed Description

The following description is provided for illustrative purposes, and other advantages and features of the present invention will become apparent to those skilled in the art from the following detailed description.

Please refer to fig. 1 to 5. It should be understood that the structure, ratio, size and the like shown in the drawings attached to the present specification are only used for matching with the content disclosed in the specification, so as to be known and read by those skilled in the art, and are not used for limiting the limit conditions that the present invention can be implemented, so that the present invention has no technical essential meaning, and any structure modification, ratio relationship change or size adjustment should still fall within the scope that the technical content disclosed in the present invention can cover without affecting the function that the present invention can produce and the purpose that the present invention can achieve. Meanwhile, the terms such as "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for convenience of description, and are not intended to limit the scope of the present invention, and changes or adjustments of the relative relationship thereof may be made without substantial technical changes, and the present invention is also regarded as the scope of the present invention.

The following examples are for illustrative purposes only. The various embodiments may be combined, and are not limited to what is presented in the following single embodiment.

Example 1

Referring to fig. 1 to 4, the present embodiment provides an alarm mechanism of a driving device of a scraper conveyor for coal mining in a mine, where the alarm mechanism of the driving device of the scraper conveyor for coal mining in the mine includes: the alarm 1 comprises a piston cylinder 101, a sealing plate 103, a piston 102, a supporting rod 104, a top block 105, a box body 111, a normally closed switch 109 and an alarm lamp 108, wherein the bottom end of the piston cylinder 101 is a closed end, the upper end of the piston cylinder 101 is an open end, the sealing plate 103 is fixedly and hermetically installed at the upper end of the piston cylinder 101, the piston 102 is slidably installed inside the piston cylinder 101, the supporting rod 104 is movably installed at the central position of the sealing plate 103, the bottom end of the supporting rod 104 is fixedly connected with the upper central position of the piston 102, the top block 105 is fixedly installed at the upper end part of the supporting rod 104, the box body 111 is fixedly installed at the side part of the piston cylinder 101 through a v-21274h-shaped bracket 110, the box body 111 is positioned above the upper end of the piston cylinder 101, the normally closed switch 109 is embedded on the bottom wall of the box body 111, the normally closed switch 109 is matched with the top block 105, the alarm lamp 108 is fixedly installed at the top of the box body 111, the alarm lamp 108 is connected in series with the normally closed switch 109, and when the top block 105 abuts against the normally closed switch 109, the normally closed switch 109 is in an open state.

More perfectly, the alarm 1 further comprises a first connecting pipe 113, the first connecting pipe 113 is fixedly installed at the bottom end of the piston cylinder 101, and the first connecting pipe 113 is communicated with the inside of the piston cylinder 101, wherein the first connecting pipe 113 is used for being communicated with the bottom of the side portion of a lubricating oil tank of the scraper conveyor driving device for mine coal mining, so that the alarm 1 is conveniently communicated with the lubricating oil tank, and the alarm mechanism is convenient to install.

More perfectly, the alarm 1 further comprises a second connecting pipe 114, the second connecting pipe 114 is fixedly installed on the side portion of the piston cylinder 101, and the second connecting pipe 114 is communicated with the inside of the piston cylinder 101, wherein the second connecting pipe 114 is conveniently communicated with a lubricating cavity inside a speed reducer of a scraper conveyor driving device for mine coal mining, so that the alarm mechanism is convenient to install.

More perfectly, the bottom of the piston 102 is higher than the connection part of the second connection pipe 114 and the piston cylinder 101 when the piston 102 is in the jacking state, so as to ensure that the first connection pipe 113 can be connected with the second connection pipe 114 when the piston 102 is in the jacking state, so as to ensure that the alarm mechanism can work normally.

More perfectly, the piston cylinder 101 is set to be a stainless steel piston cylinder, and the roughness of the inner surface of the piston cylinder 101 and the roughness of the surface of the piston 102 are not greater than Ra0.1, so that the sealing performance between the piston cylinder 101 and the piston 102 is better, and the performance of the alarm mechanism is more stable. In addition, the advantage of adopting the stainless steel piston cylinder is that the piston cylinder 101 also has the radiating effect, can cool down for lubricating oil, and then cools down for the speed reducer.

The alarm mechanism of the scraper conveyor driving device for mine coal mining adopting the technical scheme mainly comprises a piston cylinder 101, a sealing plate 103, a piston 102, a supporting rod 104, a top block 105, a box body 111, a normally closed switch 109, an alarm lamp 108, a first connecting pipe 113 and a second connecting pipe 114, when the alarm mechanism is used, lubricating oil in the first connecting pipe 113 can be utilized to jack the piston 102 up, so that the interior of the piston cylinder 101 is communicated with the second connecting pipe 114, when the piston 102 is in a jacking state, the top block 105 is jacked on the normally closed switch 109 through the supporting rod 104, at the moment, the normally closed switch 109 is in a disconnection state, the alarm lamp 108 is in a disconnection state, at the moment, the alarm lamp 108 cannot give an alarm, the lubricating mechanism of the scraper conveyor driving device for mine coal mining normally works, when the piston 102 descends, it is proved that no oil exists in the first connecting pipe 113, at the moment, the top block 105 is separated from the normally closed switch 109, normally closed switch 109 switches on alarm lamp 108 and all is in the on-state this moment, can send light warning notice staff in time to shut down the speed reducer, can avoid lack of oil in the inside lubricated chamber of speed reducer to cause high-speed shaft bearing and gear to take place to scatter, lock the trouble and influence normal production, further avoid causing the manpower, material resources are extravagant and great economic loss, compare among the prior art adopt flowmeter cooperation controller to realize sending the technical scheme of chimes of doom when lack of oil in the inside lubricated chamber of speed reducer, this technical scheme is safer, stable, reliable, can guarantee to send light warning when lack of oil in the inside lubricated chamber of speed reducer in order to guarantee that the staff can in time shut down the speed reducer, in order to eliminate lack of oil in the inside lubricated chamber of speed reducer and cause high-speed shaft bearing and gear to take place to scatter the frame, the trouble of locking.

Example 2

Referring to fig. 1 and fig. 3 to 4, the alarm mechanism of the scraper conveyor driving device for mine coal mining according to the present embodiment is different from that of embodiment 1 in that the alarm 1 further includes a buzzer 106, the buzzer 106 is fixedly installed inside the box body 111, and the buzzer 106 is connected in series with the normally closed switch 109.

More perfectly, alarm lamp 108 passes through pole setting 107 fixed mounting at the top of box body 111, can improve alarm lamp 108's light warning effect under the effect of pole setting 107.

More perfectly, the alarm 1 further comprises a one-way valve 115, the one-way valve 115 is fixedly installed on the second connecting pipe 114, and the conduction direction of the one-way valve 115 is set back to the piston cylinder 101, so that the lubricating oil in the second connecting pipe 114 can be prevented from flowing back into the piston cylinder 101, and the cleanliness of the lubricating oil in the piston cylinder 101 is ensured.

By adopting the technical scheme, the alarm mechanism of the scraper conveyor driving device for mine coal mining further has the function of sending an alarm sound under the action of the buzzer 106, so that the alarm sound sent by the buzzer 106 is conveniently utilized to inform workers that the lubricating mechanism of the scraper conveyor driving device for mine coal mining breaks down, and the workers can timely handle the faults in the coming field.

Example 3

Referring to fig. 1, 3 and 5, the alarm mechanism of the scraper conveyor driving device for mine coal mining according to the present embodiment is different from that of embodiment 2 in that the alarm 1 further includes a normally open switch 112, the normally open switch 112 is embedded in the bottom wall of the box 111, the normally open switch 112 is disposed in cooperation with the top block 105, the normally open switch 112 and the normally closed switch 109 are disposed side by side, when the top block 105 tightly pushes the normally open switch 112, the normally open switch 112 is in an open state, and the normally open switch 112 is connected in series with the motor of the scraper conveyor driving device for mine coal mining.

By adopting the alarm mechanism of the scraper conveyor driving device for mine coal mining, the lubricating oil in the first connecting pipe 113 is utilized to jack the piston 102, so that the interior of the piston cylinder 101 is communicated with the second connecting pipe 114, the top block 105 is jacked on the normally open switch 112 through the supporting rod 104 when the piston 102 is in a jacking state, the normally open switch 112 is in a closed state at the moment, the motor of the scraper conveyor driving device for mine coal mining can work, namely the speed reducer of the scraper conveyor driving device for mine coal mining can work, thereby avoiding the bad phenomenon that the speed reducer still operates under the condition of oil shortage in the lubricating cavity, the bearing and the gear of the high-speed shaft are prevented from being scattered and locked due to oil shortage in the lubricating cavity inside the speed reducer, so that normal production is not influenced, and further, waste of manpower and material resources and large economic loss are avoided.

It should be noted that the electrical components in the above embodiments are all explosion-proof and intrinsically safe electrical components.

The working principle is as follows: when the alarm mechanism of the scraper conveyor driving device for mine coal mining is used, the alarm mechanism is added to a service channel of a lubricating device of the scraper conveyor driving device for mine coal mining, lubricating oil in a lubricating oil tank can be pumped into a lubricating cavity by starting a lubricating pump of the scraper conveyor driving device for mine coal mining, a high-speed shaft bearing and a gear in a speed reducer are lubricated, when the lubricating pump works, the piston 102 is jacked up by using the lubricating oil in a first connecting pipe 113 so that the inside of a piston cylinder 101 is communicated with a second connecting pipe 114, when the piston 102 is in a jacking state, a jacking block 105 is jacked on a normally closed switch 109 and a normally open switch 112 through a supporting rod 104, at the moment, the normally closed switch 109 is in a disconnected state, the normally open switch 112 is in a closed state, a buzzer 106 and an alarm lamp 108 are both in disconnected states, at the moment, an alarm 1 cannot give an alarm to indicate that the lubricating mechanism normally works, that is to say, under the condition that the lubricating mechanism normally works, the motor can be started, the speed reducer can work, thereby the bad phenomenon that the speed reducer still operates under the condition that the lubricating cavity is lack of oil can be avoided, when the piston 102 descends, the oil does not exist in the first connecting pipe 113, at the moment, the top block 105 is separated from the normally closed switch 109, the normally closed switch 109 is conducted with the buzzer 106 and the alarm lamp 108, the sound and light alarm can be sent out to inform the working personnel to timely treat the fault in the field, meanwhile, the normally open switch 112 is in the open state, the motor stops operating, that is, the speed reducer stops working along with the normally, the speed reducer can be automatically stopped under the oil lack state, the condition that the normal production is influenced by the scattering and locking faults of the high-speed shaft bearing and the gear caused by the oil lack in the lubricating cavity in the speed reducer can be avoided, and further the manual labor force and the like can be avoided, The extravagant and great economic loss of material resources, adopt controller and flowmeter control motor to open automatically to open and stop in order to solve among the prior art and lack of oil in the inside lubricated chamber of speed reducer and cause high-speed shaft bearing and gear to take place to scatter, the problem of locking trouble, this scheme is safe, stable, reliable more, is particularly useful for the colliery to use, can stop because of the potential safety hazard that the controller often breaks down.

In summary, the following steps:

the utility model discloses, the alarm mechanism of scraper conveyor drive arrangement for coal mining of mine is mainly by piston cylinder 101, shrouding 103, piston 102, bracing piece 104, kicking block 105, box body 111, normally closed switch 109, alarm lamp 108, first connecting pipe 113, second connecting pipe 114, bee calling organ 106 and normally open switch 112 constitute, can show whether normally carry lubricating oil in real time, can report to the police when the lack of oil, make the staff know speed reducer high-speed shaft bearing lubrication condition in real time, can accomplish automatic shutdown when lubricated bad or lack of oil, can avoid causing speed reducer high-speed shaft bearing to take place to scatter the frame, the locking trouble and influence normal production, further avoid causing the manpower, material resources are extravagant and great economic loss, the speed reducer just can open in order to guarantee under the sufficient state of lubricating oil under the state just under the normal work state of lubricating mechanism simultaneously, adopt controller and flowmeter control motor to open automatically to open and stop in order to solve the inside lubricated chamber of speed reducer for prior art The problem that the high-speed shaft bearing and the gear are subjected to frame scattering and locking faults due to medium oil shortage is solved, and the scheme is safer, more stable and more reliable, is particularly suitable for coal mines, and can avoid potential safety hazards caused by frequent faults of the controller.

Therefore, the utility model effectively overcomes various defects in the prior art and has high industrial utilization value.

The above embodiments are merely illustrative of the principles and effects of the present invention, and are not to be construed as limiting the invention. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.

Claims

1. The utility model provides a mine is warning mechanism of scraper conveyor drive arrangement for coal mining which characterized in that, mine is mining scraper conveyor drive arrangement's warning mechanism includes: the alarm (1), the alarm (1) includes a piston cylinder (101), a closing plate (103), a piston (102), a support rod (104), a top block (105), a box body (111), a normally closed switch (109) and an alarm lamp (108), the bottom end of the piston cylinder (101) is a closed end, the upper end of the piston cylinder (101) is an open end, the closing plate (103) is fixedly and hermetically installed at the upper end of the piston cylinder (101), the piston (102) is slidably installed inside the piston cylinder (101), the support rod (104) is movably installed at the central position of the closing plate (103), the bottom end of the support rod (104) is fixedly connected with the upper central position of the piston (102), the top block (105) is fixedly installed at the upper end of the support rod (104), the box body (111) is fixedly installed at the side of the piston cylinder (101) through a v-21274; a shaped bracket (110), and the box body (111) is positioned above the upper end of the piston cylinder (101), the normally closed switch (109) is embedded on the bottom wall of the box body (111), the normally closed switch (109) is matched with the top block (105), the alarm lamp (108) is fixedly installed at the top of the box body (111), and the alarm lamp (108) is connected with the normally closed switch (109) in series.

2. The alarm mechanism of the scraper conveyor driving device for mine coal mining according to claim 1, wherein: alarm (1) still includes bee calling organ (106), bee calling organ (106) fixed mounting be in the inside of box body (111), just bee calling organ (106) with normally closed switch (109) series connection.

3. The alarm mechanism of the scraper conveyor driving device for mine coal mining according to claim 1, wherein: the alarm lamp (108) is fixedly arranged at the top of the box body (111) through a vertical rod (107).

4. The alarm mechanism of the scraper conveyor driving device for mine coal mining according to claim 1, wherein: the alarm (1) further comprises a first connecting pipe (113), the first connecting pipe (113) is fixedly installed at the bottom end of the piston cylinder (101), and the first connecting pipe (113) is communicated with the interior of the piston cylinder (101).

5. The alarm mechanism of the scraper conveyor driving device for mine coal mining according to claim 1, wherein: the alarm (1) further comprises a second connecting pipe (114), the second connecting pipe (114) is fixedly installed on the side portion of the piston cylinder (101), and the second connecting pipe (114) is communicated with the interior of the piston cylinder (101).

6. The alarm mechanism of the scraper conveyor driving device for mine coal mining according to claim 5, wherein: the alarm (1) further comprises a one-way valve (115), the one-way valve (115) is fixedly mounted on the second connecting pipe (114), and the conduction direction of the one-way valve (115) is back to the piston cylinder (101).

7. The alarm mechanism of the scraper conveyor driving device for mine coal mining according to claim 5, wherein: when the piston (102) is in a jacking state, the bottom of the piston is higher than the communication position of the second connecting pipe (114) and the piston cylinder (101).

8. The alarm mechanism of the scraper conveyor driving device for mine coal mining according to claim 1, wherein: the piston cylinder (101) is a stainless steel piston cylinder, and the roughness of the inner surface of the piston cylinder (101) and the roughness of the surface of the piston (102) are not more than Ra0.1.

9. The alarm mechanism of the scraper conveyor driving device for mine coal mining according to claim 1, wherein: the alarm (1) further comprises a normally open switch (112), the normally open switch (112) is embedded on the bottom wall of the box body (111), the normally open switch (112) and the top block (105) are matched, and the normally open switch (112) and the normally closed switch (109) are arranged side by side.

10. The alarm mechanism of the scraper conveyor driving device for mine coal mining according to claim 9, wherein: when the top block (105) tightly presses the normally closed switch (109), the normally closed switch (109) is in an open circuit state, and when the top block (105) tightly presses the normally open switch (112), the normally open switch (112) is in an access state.