Dust collection cleaning system

Abstract

The utility model relates to the technical field of dust collection equipment, and provides a dust collection cleaning system which comprises a switching base, a first blind hole and a second blind hole which are communicated with each other are formed in the switching base, and a cylinder communicated with the first blind hole is arranged on the side face of the switching base. The dust suction pipe is arranged in the cylinder body in a sliding manner; the dust collection cover is arranged at one end, opposite to the switching seat, of the dust collection pipe; the powerful negative pressure device is used for providing negative pressure, and the powerful negative pressure device is communicated with the second blind hole; after weighing is finished, a dust collection state is started, the dust collection pipe moves in the direction opposite to the switching base, so that the dust collection cover is connected with the stock bin in a sealed mode, the dust collection pipe is communicated with a powerful negative pressure device, and coal samples in the stock bin are removed; after cleaning is completed, the system enters a non-dust-collection state, the dust collection pipe moves in the direction towards the switching base so that the dust collection cover can be separated from the stock bin, the dust collection pipe is cut off from the powerful negative pressure device, automatic cleaning of the coal samples in the stock bin can be achieved, and the coal samples remaining in the weighing system can be efficiently and rapidly cleaned.

Description

Technical Field

[0001] The utility model relates to the technical field of dust collection equipment, in particular to a dust collection and cleaning system. Background Art

[0002] In the field of coal quality analysis, whether it is industrial analysis or elemental analysis, a single coal sample needs to be analyzed for multiple indicators, including ash content, moisture, sulfur, carbon, hydrogen, nitrogen elements, calorific value and other indicators.

[0003] In traditional laboratories, the coal sample powder to be analyzed is weighed manually. With the continuous advancement of technology, coal quality analysis has begun to develop towards intelligence, and the market has realized automated weighing. Each weighing requires the remaining coal sample after the last weighing to be cleared and the coal sample to be added again.

[0004] Therefore, how to efficiently and quickly remove the coal samples remaining in the weighing system has become an urgent problem to be solved by current technical personnel in this field. Utility Model Content

[0005] The utility model provides a dust suction and cleaning system, which is used to solve the defect of low efficiency in cleaning the remaining coal sample from the last weighing during coal quality analysis in the prior art, and realizes efficient and rapid cleaning of the coal sample remaining in the weighing system.

[0006] The utility model provides a dust suction and cleaning system, comprising:

[0007] A switching seat, wherein a first blind hole and a second blind hole are provided in the interior thereof and are connected to each other, and a cylinder connected to the first blind hole is provided on the side of the switching seat;

[0008] A dust suction pipe is slidably arranged inside the cylinder;

[0009] A dust cover is arranged at one end of the dust pipe facing away from the switching seat;

[0010] A strong negative pressure device, used for providing negative pressure, and the strong negative pressure device is connected with the second blind hole;

[0011] In the dust suction state, the dust suction pipe moves in the direction away from the switching seat, so that the dust suction cover is sealed and connected with the silo, and the dust suction pipe is connected with the strong negative pressure device;

[0012] In a non-dust suction state, the dust suction pipe moves toward the switching seat to separate the dust suction hood from the silo, and the dust suction pipe is disconnected from the strong negative pressure device.

[0013] A dust collection and cleaning system provided by the utility model also includes:

[0014] A linear mechanism is connected to the dust suction pipe, and the linear mechanism is used to provide power for the movement of the dust suction pipe.

[0015] According to a dust suction and cleaning system provided by the utility model, one end of the dust suction main pipe is connected to the second blind hole, and the other end is connected to the strong negative pressure device; in the dust suction state, the dust suction pipe is connected to the dust suction main pipe; in the non-dust suction state, the dust suction pipe and the dust suction main pipe are cut off.

[0016] According to a dust suction and cleaning system provided by the utility model, at least one notch is arranged at one end of the silo facing the dust suction pipe, so that the airflow forms a cyclonic vortex.

[0017] According to a dust suction and cleaning system provided by the utility model, the air inlet of the dust suction pipe is perpendicular to the direction of the negative pressure airflow.

[0018] According to a dust cleaning system provided by the utility model, the switching seat, the dust pipe and the dust hood are provided in plurality and are arranged in one-to-one correspondence, each of the dust hoods corresponds to one of the silos, and each of the switching seats is connected to the dust main pipe.

[0019] According to a dust suction and cleaning system provided by the utility model, the dust suction pipe and the dust suction hood are detachably connected.

[0020] According to a dust suction and cleaning system provided by the utility model, the dust hood is conical, including a large head end and a small head end, the large head end is open, and the large head end is adapted to the silo, and the dust suction pipe is connected to the side of the dust hood.

[0021] According to a dust suction and cleaning system provided by the utility model, it also includes a weighing device, and the weighing device is arranged at the bottom of the silo.

[0022] According to a dust suction and cleaning system provided by the utility model, a connecting plate is fixedly connected to the top of the dust suction pipe, and the linear mechanism is arranged on the top of the switching seat; the connecting plate is connected to the linear mechanism.

[0023] The utility model provides a dust suction and cleaning system, which is characterized by opening a first blind hole and a second blind hole interconnected with each other inside a switching seat, a cylinder body connected with the first blind hole being arranged on the side of the switching seat, a dust suction pipe being slidably arranged inside the cylinder body, a dust suction hood being arranged at an end of the dust suction pipe facing away from the switching seat, a strong negative pressure device being connected with the second blind hole, and entering a dust suction state after weighing is completed. When entering the dust suction state, the dust suction pipe moves in a direction facing away from the switching seat so that the dust suction hood is sealedly connected with the silo, and the dust suction pipe is connected with the strong negative pressure device to remove the coal sample in the silo; after removing is completed, the utility model enters a non-dust suction state, the dust suction pipe moves in a direction toward the switching seat so that the dust suction hood is separated from the silo, and the dust suction pipe is cut off from the strong negative pressure device, thereby realizing automatic removal of the coal sample in the silo.

[0024] In addition, connecting multiple dust collection interfaces in series can clean multiple silos, greatly improving the dust collection and cleaning efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 It is a structural schematic diagram of the dust collection state of the dust collection and cleaning system of an embodiment of the utility model;

[0027] Figure 2 It is a structural schematic diagram of the dust collection and cleaning system of the embodiment of the utility model in a non-dust collection state;

[0028] Figure 3 This is a schematic diagram of the structure of the switching seat of the embodiment of the utility model;

[0029] Figure 4 It is a cross-sectional view of a switching seat of an embodiment of the utility model;

[0030] Figure 5 It is a structural schematic diagram of the dust collection and cleaning system of an embodiment of the utility model;

[0031] Figure 6 It is a schematic diagram of the structure of the dust suction hood and the dust suction pipe in the embodiment of the utility model;

[0032] Figure 7 It is a structural schematic diagram of a silo in an embodiment of the utility model;

[0033] Figure 8 It is a cross-sectional view of a silo in an embodiment of the utility model;

[0034] Reference numerals:

[0035] 1. Switching seat; 101. First blind hole; 102. Second blind hole;

[0036] 2. Cylinder; 3. Dust suction pipe; 4. Dust suction hood; 5. Silo; 501. Notch; 6. Linear mechanism; 7. Dust suction main pipe; 8. Weighing device; 9. Connecting plate. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be described clearly and completely in conjunction with the drawings in the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0038] In the description of the embodiments of the present utility model, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present utility model. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0039] Combine the following Figures 1 to 8 The dust collection and cleaning system according to the embodiment of the utility model is described.

[0040] like Figure 1-5 As shown, an embodiment of the utility model provides a dust suction and cleaning system, including a switching seat 1, a dust suction pipe 3, a dust suction hood 4 and a negative pressure force device.

[0041] The switching seat 1 has a first blind hole 101 and a second blind hole 102 connected to each other, and a cylinder 2 connected to the first blind hole 101 is provided on the side of the switching seat 1; the dust suction pipe 3 is slidably arranged inside the cylinder 2, and is used to switch between the dust suction state and the non-dust suction state. The dust suction hood 4 is arranged at the end of the dust suction pipe 3 facing away from the switching seat 1, and is used to be sealed and connected to the silo 5. The strong negative pressure device is used to provide negative pressure, and the strong negative pressure device is connected to the second blind hole 102, and is used to generate suction through the dust suction pipe 3 in the dust suction state.

[0042] In the dust suction state, the dust suction pipe 3 moves in the direction away from the switching seat 1 so that the dust suction hood 4 is sealed and connected with the silo 5, the dust suction hood 4 is aimed at the silo 5 to be cleaned, and the dust suction pipe 3 is connected with the strong negative pressure device to form a negative pressure suction force, and the dust or impurities in the silo 5 are sucked in through the dust suction hood 4.

[0043] In the non-dust suction state, the dust suction pipe 3 moves toward the switching seat 1 to separate the dust suction hood 4 from the silo 5, and the dust suction pipe 3 is cut off from the strong negative pressure device to stop the dust suction operation to avoid safety hazards caused by misoperation.

[0044] Therefore, the dust collection and cleaning system provided in the embodiment of the utility model forms a strong negative pressure through a strong negative pressure device, thereby achieving the dust collection and cleaning effect on the coal powder remaining on the inner wall of the silo 5. The dust collection pipe 3 is opened and closed by the switching seat 1 to achieve the negative pressure effect of connecting and disconnecting the negative pressure of the dust collection pipe 3.

[0045] In a feasible embodiment of the utility model, it also includes a linear mechanism 6, which is connected to the dust suction pipe 3, and the linear mechanism 6 is used to provide power for the movement of the dust suction pipe 3. The movement of the dust suction pipe 3 is driven by the linear mechanism 6, thereby realizing the connection between the dust suction pipe 3 and the strong negative pressure device, or the disconnection between the dust suction pipe 3 and the strong negative pressure device.

[0046] In the vacuuming state, the user starts the linear mechanism 6 to drive the vacuum tube 3 to move in the direction away from the switching seat 1. When the vacuum tube 3 moves to an appropriate position, the dust hood 4 and the silo 5 form a sealed connection. At this time, the internal channel of the vacuum tube 3 is connected to the strong negative pressure device to form a negative pressure suction force, and the dust or impurities in the silo 5 are sucked in through the dust hood 4.

[0047] In the non-dust suction state, the user starts the linear mechanism 6 again to drive the dust suction tube 3 to move toward the switching seat 1. When the dust suction tube 3 moves to the appropriate position, the dust suction tube 3 is separated from the silo 5. At the same time, the dust suction tube 3 blocks the first blind hole 101 and the second blind hole 102, and the internal channel of the dust suction tube 3 is cut off from the strong negative pressure device, and the dust suction operation stops.

[0048] The setting of the linear mechanism 6 automates the movement process of the dust suction pipe 3, reduces the user's manual operation, and improves work efficiency. The strong negative pressure device provides strong suction to ensure that the coal powder is effectively sucked into the dust suction hood 4, thereby improving the dust suction and cleaning efficiency.

[0049] like Figure 6 As shown, specifically, a connecting plate 9 is fixedly connected to the top of the dust suction tube 3, and a linear mechanism 6 is arranged on the top of the switching seat 1; the connecting plate 9 is connected to the linear mechanism 6, and the connecting plate 9 is used to provide power for the dust suction tube 3 to slide in the cylinder 2.

[0050] By introducing the top mounting design of the connecting plate 9 and the linear mechanism 6, the vacuum cleaning system is not only compact in structure and easy to operate, but also highly efficient and safe, providing users with a better use experience.

[0051] In a feasible embodiment of the utility model, it also includes a dust suction pipe 7, one end of which is connected to the second blind hole 102, and the other end is connected to the strong negative pressure device; in the dust suction state, the dust suction pipe 3 is connected to the dust suction pipe 7, allowing negative pressure to pass through; in the non-dust suction state, the dust suction pipe 3 and the dust suction pipe 7 are cut off, preventing negative pressure from passing through.

[0052] like Figure 7 and Figure 8 As shown, in a feasible embodiment of the utility model, at least one notch 501 is provided at one end of the silo 5 facing the dust suction pipe 3 so that the airflow forms a cyclonic vortex, so that the air inlet of the dust suction pipe 3 forms a certain angle with the silo 5.

[0053] like Figure 1 As shown, in a feasible embodiment of the present invention, the air inlet of the dust suction pipe 3 is perpendicular to the negative pressure airflow direction. The negative pressure airflow direction can be understood as being along the axis direction of the second blind hole 102.

[0054] The air inlet of the dust suction pipe 3 is perpendicular to the negative pressure airflow direction. First, when the negative pressure airflow direction is perpendicular to the air inlet of the dust suction pipe 3, the airflow enters the dust suction pipe 3 at a nearly right angle. This vertical entry method can ensure that the airflow enters the dust suction pipe 3 more concentratedly and stably, reduce the diffusion and loss of the airflow, and thus improve the dust collection efficiency.

[0055] Secondly, the vertical airflow direction also helps prevent dust and impurities from accumulating inside the dust suction pipe 3. Since the airflow enters vertically, dust and impurities are more likely to be directly sucked in and carried away along the airflow direction rather than being deposited on the pipe wall. This helps keep the dust suction pipe 3 clean and unobstructed, further improving the dust suction effect.

[0056] In addition, this design can also reduce the wear and impact of the airflow on the dust suction pipe 3. Since the airflow enters vertically instead of directly impacting the inner wall of the dust suction pipe 3, the wear and impact of the airflow on the pipe wall can be reduced, and the service life of the dust suction pipe 3 can be extended.

[0057] In general, the design of the air inlet of the dust suction pipe 3 being perpendicular to the negative pressure airflow direction can improve the dust suction efficiency, keep the dust suction pipe clean and unobstructed, and reduce the wear and impact of the airflow on the dust suction pipe. This design is very effective and practical in the dust suction cleaning system.

[0058] like Figure 5As shown, in a feasible embodiment of the present invention, a plurality of switching seats 1, dust suction pipes 3 and dust suction hoods 4 are provided, and they are arranged one by one, each dust suction hood 4 corresponds to a material bin 5, and each switching seat 1 is connected to the dust suction main pipe 7. That is, the dust suction main pipe 7 is connected in series with the switching seat 1, and each switching seat 1 is provided with a dust suction pipe 3 and a dust suction hood 4, so that cleaning of multiple workstations can be achieved.

[0059] In the vacuuming state, the user starts the linear mechanism 6 on each switching seat 1 to drive the corresponding dust suction pipe 3 to move in the direction away from the switching seat 1. When the dust suction pipe 3 moves to the appropriate position, each dust suction hood 4 will form a sealed connection with the corresponding silo 5. At this time, each dust suction pipe 3 will be connected to the dust suction pipe 7. The strong negative pressure device generates negative pressure suction through the dust suction pipe 7 and the dust suction pipe 3 to suck the dust or impurities in the corresponding silo 5 into the dust suction hood 4.

[0060] In the non-dust suction state, the user starts the linear mechanism 6 on each switching seat 1 again to drive the corresponding dust suction pipe 3 to move toward the switching seat 1. When the dust suction pipe 3 moves to the appropriate position, each dust suction hood 4 will be separated from the corresponding silo 5. At the same time, each dust suction pipe 3 will be cut off from the corresponding dust suction main pipe 7, the strong negative pressure device stops providing negative pressure, and the dust suction operation stops.

[0061] Multiple dust hoods 4 and dust pipes 3 work simultaneously, which can greatly improve the cleaning efficiency. In addition, each dust hood 4 can work independently and can selectively clean different silos 5. Each switching seat 1 and dust pipe 3 are independent, and even if one of them fails, it will not affect the normal operation of other parts. In addition, the modular setting makes the system easy to maintain and replace parts.

[0062] In a feasible embodiment of the utility model, the dust suction pipe 3 and the dust suction hood 4 are detachably connected, which is convenient for replacement and maintenance of the dust suction hood 4. The dust suction pipe 3 and the dust suction hood 4 can be connected by bolts or other structures. In addition, a sealing ring can be provided at the bottom end of the dust suction hood 4 to achieve a sealed connection between the dust suction hood 4 and the silo 5. Generally speaking, the sealing ring is made of rubber material.

[0063] In a feasible embodiment of the utility model, the dust hood 4 is conical, including a large end and a small end, the large end is open, and the large end is adapted to the silo 5 to ensure that it is closely fitted with the silo 5 in the dust collection state to form an effective seal to prevent coal powder leakage. The small end is connected to the dust pipe 3, allowing airflow from the silo 5 to pass through the dust hood 4 and enter the dust pipe 3. The dust pipe 3 is connected to the side of the dust hood 4 to achieve airflow transmission.

[0064] In a feasible embodiment of the utility model, a weighing device 8 is also included. The weighing device 8 is arranged at the bottom of the silo 5. The arrangement of the weighing device 8 adds a real-time monitoring function for the material in the silo 5. The weighing device 8 can transmit weight data to the control system for recording and analysis, and provide accurate data support for the user. In combination with the control system, relevant operations can be automatically triggered according to the weight of the material in the silo 5.

[0065] To sum up, in the dust suction and cleaning system provided by the utility model, the linear mechanism 6 is installed on the top of the switching seat 1, the dust hood 4 and the dust suction pipe 3 are connected together, and the dust suction pipe 3 is inserted into the first blind hole 101 of the switching seat 1, and the dust suction main pipe 7 is inserted into the second blind hole 102 of the switching seat 1, the first blind hole 101 and the second blind hole 102 are connected, the silo 5 is installed on the top of the weighing device 8, and a sealing ring is installed at the big end of the silo 5, and a groove is opened at the interface of the big end for dust suction and air intake.

[0066] The working principle of the dust suction and cleaning system provided by the utility model is:

[0067] When the dust suction main pipe 7 forms a strong negative pressure through the strong negative pressure device.

[0068] When the system is in the dust suction state, negative pressure is formed above the silo 5 through the switching seat 1, the dust suction pipe 3 and the dust suction hood 4. The sealing ring at the silo 5 tightly combines the hopper and the dust suction hood 4. The air enters the silo 5 through the gap on the hopper and forms a powerful cyclone vortex that sweeps across the inner wall of the silo 5 and takes away the residual coal sample in the silo 5 and enters the dust suction main pipe 7 along the dust suction pipe 3 for discharge.

[0069] When in the non-dust suction state, that is, the cleaning and dust suction closed state, the dust suction pipe 3 is closed by the sealing plate of the switching seat 1, and the negative pressure of the dust suction main pipe 7 is disconnected.

[0070] Therefore, the dust suction cleaning system provided by the utility model realizes the negative pressure effect of connecting and disconnecting the negative pressure of the dust suction pipe 3 by moving the dust suction pipe 3 and opening and closing the switch seat 1. The dust suction pipe 3 realizes the connection or disconnection state with the dust suction main pipe 7 in the switch seat 1 through the linear mechanism 6, thereby realizing the dust suction cleaning switch effect. Simply opening a notch on the silo 5 can realize the cyclone vortex phenomenon required for cleaning.

[0071] According to the needs, multiple switching seats 1, linear mechanisms 6, dust suction pipes 3 and dust suction hoods 4 can be connected in series on the dust suction main pipe to clean different silos 5 or parts that need to be cleaned by dust suction, and they can be opened at the same time for cleaning according to the needs. The utility model has high efficiency, simple structure, low cost, low noise, easy maintenance and repair, and flexible layout.

[0072] In the description of the embodiments of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific circumstances.

[0073] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "mode", "specific mode", or "some modes" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or mode are included in at least one embodiment or mode of the utility model embodiment. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or mode. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or modes in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or modes described in this specification and the features of the different embodiments or modes, without contradiction.

[0074] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A dust collection and cleaning system, characterized in that: include: A switching seat (1) is provided with a first blind hole (101) and a second blind hole (102) which are connected to each other, and a cylinder (2) which is connected to the first blind hole (101) is provided on a side surface of the switching seat (1); A dust suction pipe (3) is slidably arranged inside the cylinder (2); A dust cover (4) is arranged at one end of the dust suction pipe (3) facing away from the switching seat (1); A strong negative pressure device, used for providing negative pressure, and the strong negative pressure device is connected to the second blind hole (102); In the dust suction state, the dust suction pipe (3) moves in a direction away from the switching seat (1), so that the dust suction cover (4) is sealedly connected to the silo (5), and the dust suction pipe (3) is connected to the strong negative pressure device; In the non-dust suction state, the dust suction pipe (3) moves in the direction toward the switching seat (1) so that the dust suction hood (4) is separated from the material bin (5), and the dust suction pipe (3) is disconnected from the strong negative pressure device.

2. The dust suction and cleaning system according to claim 1, characterized in that: Also includes: A linear mechanism (6) is connected to the dust suction pipe (3), and the linear mechanism (6) is used to provide power for the movement of the dust suction pipe (3).

3. The dust suction and cleaning system according to claim 1, characterized in that: Also includes: A dust suction main pipe (7), one end of which is connected to the second blind hole (102), and the other end of which is connected to the strong negative pressure device; In the dust suction state, the dust suction pipe (3) is connected to the dust suction main pipe (7); in the non-dust suction state, the dust suction pipe (3) is disconnected from the dust suction main pipe (7).

4. The dust suction and cleaning system according to claim 1, characterized in that: At least one notch (501) is provided at one end of the silo (5) facing away from the dust suction pipe (3) so that the airflow forms a cyclonic vortex.

5. The dust suction and cleaning system according to claim 1, characterized in that: The air inlet of the dust suction pipe (3) is perpendicular to the direction of the negative pressure airflow.

6. The dust suction and cleaning system according to claim 3, characterized in that: The switching seat (1), the dust suction pipe (3) and the dust suction hood (4) are provided in plurality and are arranged in one-to-one correspondence, each of the dust suction hoods (4) corresponds to one of the silos (5), and each of the switching seats (1) is connected to the dust suction main pipe (7).

7. The dust suction and cleaning system according to claim 1, characterized in that: The dust suction pipe (3) and the dust suction hood (4) are detachably connected.

8. The dust suction and cleaning system according to claim 1, characterized in that: The dust hood (4) is in a truncated cone shape, comprising a large end and a small end, and the large end is adapted to the silo (5), and the dust suction pipe (3) is connected to the side of the dust hood (4).

9. The dust suction and cleaning system according to claim 1, characterized in that: It also comprises a weighing device (8), wherein the weighing device (8) is arranged at the bottom of the silo (5).

10. The dust suction and cleaning system according to claim 2, characterized in that: A connecting plate (9) is fixedly connected to the top of the dust suction pipe (3); the linear mechanism (6) is arranged on the top of the switching seat (1); and the connecting plate (9) is connected to the linear mechanism (6).

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