CN221545886U - Automatic water pumping device for water pool - Google Patents

Abstract

The utility model discloses an automatic water pumping device for a pool, and relates to the technical field of automation. When the device starts to work, water enters the water inlet pipeline, flows into the water accumulation cavity in the box body, then the water flow in the water accumulation cavity rises, so that the judging part is driven to move in position, when the water flow reaches a high liquid level, the judging part can cooperatively move with the switching part, then the water pump is started, the water pump pumps water out of the water accumulation cavity through the water outlet pipeline, when the water level in the water accumulation cavity reaches a low liquid level, the switching part stops working, and then the water pump stops working, so that the effects that the water pump is started automatically when the water in the water accumulation cavity reaches the high liquid level, and the water pump stops working when the water level reaches the low liquid level are achieved.

Description

Automatic water pumping device for water pool

Technical Field

The utility model relates to the technical field of automation, in particular to an automatic water pumping device for a pool.

Background

The existing sewage pool is filtered, the reclaimed water is manually pumped by a water pump, waste is wasted, workload is increased, working efficiency is reduced, and people need to watch beside when water is fed and discharged, so that workers need to frequently pay attention to dispersing in work, and working accidents are easy to occur. And the waste of human resources is greatly caused, and the cost is increased.

In order to reduce the manual work load, the invention provides an automatic water pumping device for a water tank, which solves the problem of more manual work load and can realize the effects of easy observation and automatic water pumping of the water tank.

Disclosure of Invention

The utility model aims to provide an automatic water pumping device for a pool, which aims to solve the problems in the background technology.

In order to solve the technical problems, the utility model adopts the following technical scheme:

The utility model provides an automatic pumping device for pond, includes the box, is provided with ponding chamber and reaction chamber in the box, and the box outside is provided with the water pump, and the one end of water pump is passed through outlet conduit and is connected with ponding chamber, is provided with the judgement part that is used for judging the water level height in the box, and the reaction chamber inside is provided with the switch part that is used for switching on and off the water pump, is provided with the baffle in the box, has seted up flutedly on the baffle, and one side fixedly connected with control panel of box is provided with inlet conduit, is connected with the relay between water pump and the judgement part.

When the device starts to work, water enters the water accumulation cavity in the box body through the water inlet pipeline, then the water flow in the water accumulation cavity rises in height, so that the judging component is driven to move in position, when the water flow reaches a high liquid level, at the moment, the judging component can cooperatively move with the switching component, then the water pump is started, the water pump pumps out the water from the water accumulation cavity through the water outlet pipeline, when the water level in the water accumulation cavity reaches a low liquid level, the switching component stops working at the moment, then the water pump stops working, and therefore the effect that when the water in the water accumulation cavity reaches the high liquid level, the water pump is started automatically, and when the water level is low, the water pump stops working is achieved.

The technical scheme of the utility model is further improved as follows: judging the part and including the slide, the spout has been seted up to one side of slide, be provided with the buoy in the box, one side fixed connection of buoy is provided with the connecting rod, one side of connecting rod is provided with the slider, one side that the buoy was kept away from to the slide is provided with the connecting plate, fixed connection is provided with the back shaft on the connecting plate, be provided with the bull stick in the reaction chamber, the bull stick rotates with the back shaft to be connected, fixedly connected with jackshaft on the bull stick, sliding connection has electrically conductive post on the jackshaft, be provided with the spring between electrically conductive post and the bull stick, the one end and the electrically conductive post fixed connection of spring, the other end and the bull stick fixed connection of spring, the electrically conductive post is kept away from the one end of spring and is judged the part conflict, electrically conductive post passes through circuit and relay electric connection.

By adopting the technical scheme, when water flows in the ponding cavity, the buoy on one side of the sliding plate starts to float on the water surface under the influence of the water flow height, the height of the buoy changes along with the change of the water flow height, when the water flow height reaches a certain time, the buoy starts to drive the sliding plate to move together under the influence of the water flow buoyancy, at the moment, the sliding plate drives the conductive column on one side to move upwards through the connecting rod and the rotating rod, the conductive column is always connected with the judging part, when the water flow height in the ponding cavity reaches a certain height, the switch part is electrified, the conductive column is electrified, current is led into the relay, the relay is electrified in the prior art, the water pump starts to pump water through the water outlet pipeline, when the water level reaches a low liquid level, the switch part is disconnected, no current passes through the relay, and the water pump stops working at the moment, thereby achieving the effects that when the water in the ponding cavity reaches the high liquid level, the water pump stops working when the low liquid level.

The technical scheme of the utility model is further improved as follows: the switch component comprises a conducting plate, the conducting plate is fixedly connected with the box body, the conducting plate is equally divided into an area A and an area B, a point C and a point D are respectively arranged on the conducting plate, the point C and the point D are both convex, the area B is conductive, and the outer side of the conducting plate is insulated.

By adopting the technical scheme, in the scheme, when the water surface is positioned at a low liquid level, the conductive column is positioned in the area A, when the sliding plate drives the conductive column to move upwards to reach a high liquid level, the conductive column moves upwards along the area A, when the conductive column reaches the high liquid level, the conductive column passes through the point C, at the moment, the position of the conductive column reaches the area B, because the area B of the conductive plate is in a conductive state, current flows into the conductive column through the area B, so that the relay is electrified, the water pump starts to work, the water pump pumps water, the water surface can be lowered, the conductive column can only move downwards along the area B, the water pump can always work because the area B is always conductive, when the water pump reaches the low liquid level, the conductive column reaches the area A through the point D, no current passes through the relay, and the water pump stops working.

The technical scheme of the utility model is further improved as follows: one side of the box body is provided with a water outlet, a baffle is arranged at the water outlet, the baffle is rotationally connected with the box body, a magnet is fixedly connected inside the baffle, and an electromagnet is fixedly connected on the box body below the baffle.

Adopt above-mentioned technical scheme, when control panel's switch is the off-state in this scheme, at this moment, the electro-magnet circular telegram holds magnet firmly for the baffle can not open because of the pressure of rivers, when control panel opens, the electro-magnet outage this moment, and the baffle can open because of the pressure of rivers is too big, goes out water work, thereby realizes that manual also can control the height of water surface in the ponding chamber.

The technical scheme of the utility model is further improved as follows: the rotation angle of the rotating rod is limited to a certain degree.

By adopting the technical scheme, the rotating angle of the rotating rod is limited in the scheme, so that in actual work, if the rotating angle of the rotating rod is overlarge, the height of the water surface in the water accumulation cavity cannot be accurately controlled. When the water level in the water accumulation cavity is too high, the normal work of the water pump can be influenced, and the working efficiency is reduced; when the water level in the water accumulation cavity is too low, the water pump can be caused to work continuously, and the working efficiency can be reduced. Therefore, the rotating angle of the rotating rod is limited, so that the height of the water surface in the water accumulation cavity can be accurately controlled in the working process, the normal work of the water pump is ensured, and the working efficiency is improved.

The technical scheme of the utility model is further improved as follows: the spout sets up in the middle part of slide, and the buoy has certain clearance from the box bottom.

By adopting the technical scheme, the buoy is arranged in the scheme, and a certain gap is reserved between the buoy and the bottom of the box body, so that the bottom of the buoy is prevented from being stained with impurities such as dirt deposited in water at the bottom of the box body, and the working efficiency of the device is not affected.

The technical scheme of the utility model is further improved as follows: the box body is provided with a slide hole, the slide plate is in sliding connection with the slide hole, and the position of the slide plate, which is close to the top, is provided with scales.

By adopting the technical scheme, the liquid level of the water surface can be observed more conveniently by providing the scales on the top of the sliding plate in the scheme, and the sliding plate can change along with the change of the liquid level of the water surface, so that the working personnel can observe the liquid level of the water surface more clearly and conveniently, and the working efficiency is greatly improved.

By adopting the technical scheme, compared with the prior art, the utility model has the following technical progress:

1. The utility model provides an automatic water pumping device for a water pool, when a switch of a control panel is in a closed state, an electromagnet is electrified to firmly attract the magnet, so that a baffle cannot be opened due to the pressure of water flow, when the control panel is opened, the electromagnet is powered off, the baffle can be opened due to the overlarge pressure of the water flow, water outlet work is carried out, and therefore the height of the water surface in a water accumulation cavity can be controlled manually.

2. The utility model provides an automatic water pumping device for a water pool, which limits the rotation angle of a rotating rod, because in actual work, if the rotation angle of the rotating rod is too large, the height of the water surface in a water accumulation cavity cannot be accurately controlled. When the water level in the water accumulation cavity is too high, the normal work of the water pump can be influenced, and the working efficiency is reduced; when the water level in the water accumulation cavity is too low, the water pump can be caused to work continuously, and the working efficiency can be reduced. Therefore, the rotating angle of the rotating rod is limited, so that the height of the water surface in the water accumulation cavity can be accurately controlled in the working process, the normal work of the water pump is ensured, and the working efficiency is improved.

3. The utility model provides an automatic water pumping device for a pool, which is characterized in that a certain gap is arranged between a buoy and the bottom of a box body, so that the bottom of the buoy can be prevented from being stained with impurities such as dirt deposited in water at the bottom of the box body, and the working efficiency of the device is not affected.

4. The utility model provides an automatic water pumping device for a pool, which is characterized in that the top of a sliding plate is provided with scales, so that the liquid level on the water surface can be observed more conveniently, and the sliding plate can change along with the change of the liquid level on the water surface, so that a worker can observe the liquid level on the water surface more clearly and conveniently, and the working efficiency is greatly improved.

Drawings

The invention is further described below with reference to the accompanying drawings.

FIG. 1 is a schematic diagram of the structure of the present utility model;

FIG. 2 is a schematic view of a first cross-sectional structure of the present utility model;

FIG. 3 is a schematic view of a second cross-section of the present utility model;

FIG. 4 is a schematic view of a partial structure of the present utility model;

FIG. 5 is a schematic diagram of a left structure of the judging structure of the present utility model;

FIG. 6 is a right schematic diagram of a judging structure according to the present utility model

In the figure: 1. a case; 2. a water accumulation cavity; 3. a reaction chamber; 4. a water pump; 5. a water outlet pipe; 6. a partition plate; 7. a groove; 8. a control panel; 9. a water inlet pipe; 10. a slide plate; 11. a chute; 12. a buoy; 13. a connecting rod; 14. a slide block; 15. a connecting plate; 16. a support shaft; 17. a rotating rod; 18. an intermediate shaft; 19. a conductive post; 20. a spring; 21. a water outlet; 22. a baffle; 23. a conductive plate; 24. an electromagnet; 25. a slide hole; 26. a scale.

Detailed Description

The utility model is further illustrated by the following examples:

example 1

As shown in fig. 2, the utility model provides an automatic water pumping device for a water pool, which comprises a box body 1, wherein a water accumulation cavity 2 and a reaction cavity 3 are arranged in the box body 1, a water pump 4 is arranged on the outer side of the box body 1, one end of the water pump 4 is connected with the water accumulation cavity 2 through a water outlet pipeline 5, a judging part for judging the water level is arranged in the box body 1, a switch part for switching the water pump 4 is arranged in the reaction cavity 3, a partition plate 6 is arranged in the box body 1, a groove 7 is formed in the partition plate 6, a control panel 8 is fixedly connected to one side of the box body 1, a water inlet pipeline 9 is arranged on one side of the box body 1, and a relay is connected between the water pump 4 and the judging part.

In this embodiment, when the device starts to work, the water inlet pipe 9 has water entering, flows into the water accumulation cavity 2 in the box 1, then the height of water flow in the water accumulation cavity 2 rises, so as to drive the judging component to move in position, when the height of water flow reaches a high liquid level, the judging component can cooperatively move in conjunction with the switching component, then the water pump 4 is started, the water pump 4 pumps water out of the water accumulation cavity 2 through the water outlet pipe 5, when the height of water level in the water accumulation cavity 2 reaches a low liquid level, the switching component stops working at the moment, then the water pump 4 stops working, so that the effect that when the water in the water accumulation cavity 2 reaches the high liquid level, the water pump 4 is started automatically, and when the water level is low, the water pump 4 stops working is achieved.

As shown in fig. 2 and 4, in this embodiment, preferably, the judging component includes a sliding plate 10, a sliding groove 11 is formed in one side of the sliding plate 10, a buoy 12 is provided in the box 1, a connecting rod 13 is fixedly connected to one side of the buoy 12, a sliding block 14 is provided on one side of the connecting rod 13, a connecting plate 15 is provided on one side of the sliding plate 10 far away from the buoy 12, a supporting shaft 16 is fixedly connected to the connecting plate 15, a rotating rod 17 is provided in the reaction cavity 3, the rotating rod 17 is rotationally connected with the supporting shaft 16, an intermediate shaft 18 is fixedly connected to the rotating rod 17, a conductive column 19 is slidingly connected to the intermediate shaft 18, a spring 20 is provided between the conductive column 19 and the rotating rod 17, one end of the spring 20 is fixedly connected with the conductive column 19, the other end of the spring 20 is fixedly connected with the rotating rod 17, one end of the conductive column 19 far away from the spring 20 abuts against the judging component, and the conductive column 19 is electrically connected with the relay through a circuit.

When water enters the water accumulation cavity 2, the buoy 12 on one side of the sliding plate 10 begins to float on the water surface under the influence of the water flow height, the height of the buoy is changed along with the change of the water flow height, when the water flow height reaches a certain time, the buoy 12 is influenced by the buoyancy of the water surface, the sliding plate 10 starts to move together, at the moment, the sliding plate 10 drives the conductive column 19 on one side to move upwards through the connecting rod 13 and the rotating rod 17, the conductive column 19 is always connected with the judging part, when the water surface height in the water accumulation cavity 2 reaches a certain height, the switch part is electrified, the conductive column 19 is electrified, the current is led into the relay, the relay is electrified because the relay is in the prior art, the water pump 4 starts to pump water through the water outlet pipeline 5, when the water level reaches a low liquid level, the switch part is disconnected, no current passes through the relay, the water pump 4 stops working at the moment, the effect that when the water in the water accumulation cavity 2 reaches a high liquid level is automatically started, and when the water pump 4 stops working at a low liquid level is achieved.

As shown in fig. 5 and 6, preferably, the switch component includes a conductive plate 23, the conductive plate 23 is fixedly connected with the box 1, the conductive plate 23 is uniformly divided into a region a and a region B, the conductive plate 23 is respectively provided with a point C and a point D, the points C and D are both convex, the region B is conductive, and the conductive plate 23 is insulated.

When the water surface is at a low liquid level, the conductive column 19 is located in the area A, when the slide plate 10 drives the conductive column 19 to move upwards to reach a high liquid level, the conductive column 19 moves upwards along the area A, when the slide plate reaches the high liquid level, the conductive column 19 passes through the point C, at this time, the position of the conductive column 19 reaches the area B, because the area B of the conductive plate 23 is in a conductive state, current flows into the conductive column 19 through the area B, so that the relay is electrified, the water pump 4 starts to work, the water pump 4 pumps water, the water surface level can be lowered, the conductive column 19 only moves downwards along the area B, the water pump 4 can always work because the area B is always conductive, when the slide plate reaches the low liquid level, the conductive column 19 passes through the point D to reach the area A, no current passes through the relay, and the water pump 4 stops working.

Example 2

As shown in fig. 2, on the basis of embodiment 1, the present utility model provides a technical solution: preferably, a water outlet 21 is formed in one side of the box body 1, a baffle 22 is arranged at the water outlet 21, the baffle 22 is rotationally connected with the box body 1, a magnet is fixedly connected inside the baffle 22, and an electromagnet 24 is fixedly connected on the box body 1 below the baffle 22.

In this embodiment, when the switch of the control panel 8 is in the off state, the electromagnet 24 is energized to firmly attract the magnet, so that the baffle 22 cannot be opened due to the pressure of water flow, when the control panel 8 is opened, the electromagnet 24 is de-energized, and the baffle 22 can be opened due to the overlarge pressure of water flow to perform water outlet operation, thereby realizing that the height of the water surface in the water accumulation cavity 2 can be controlled manually.

Example 3

As shown in fig. 2, on the basis of embodiment 1, the present utility model provides a technical solution: preferably, the rotation angle of the rotating lever 17 is limited.

In the present embodiment, the angle of rotation of the rotating lever 17 is limited because in actual operation, if the angle of rotation of the rotating lever 17 is too large, it results in that the height of the water surface in the water accumulation chamber 2 cannot be precisely controlled. When the water surface height in the water accumulation cavity 2 is too high, the normal work of the water pump 4 is affected, and the working efficiency is reduced; when the water level in the water accumulation cavity 2 is too low, the water pump 4 can continue to work, and the working efficiency can be reduced. Therefore, by limiting the rotation angle of the rotating rod 17, the height of the water surface in the water accumulation cavity 2 can be accurately controlled in the working process, so that the normal work of the water pump 4 is ensured, and the working efficiency is improved.

Example 4

As shown in fig. 3, on the basis of embodiment 1, the present utility model provides a technical solution: preferably, the chute 11 is arranged in the middle of the slide plate 10, and the buoy 12 is spaced from the bottom of the box 1 by a certain gap.

In this embodiment, the buoy 12 is disposed at a certain distance from the bottom of the tank 1, so as to prevent the bottom of the buoy 12 from being contaminated with impurities such as dirt deposited in the water at the bottom of the tank 1, so as not to affect the working efficiency of the device.

Example 5

As shown in fig. 1, on the basis of embodiment 1, the present utility model provides a technical solution: preferably, the box body 1 is provided with a slide hole 25, the slide plate 10 is in sliding connection with the slide hole 25, and a scale 26 is arranged at a position of the slide plate 10 close to the top.

In this embodiment, the scale 26 is provided on the top of the slide plate 10 to more conveniently observe the liquid level on the water surface, because the slide plate 10 changes along with the change of the liquid level on the water surface, the operator can observe the liquid level on the water surface more clearly and conveniently, and the working efficiency is greatly improved.

The working principle of the automatic water pumping device for the water pool is specifically described below.

As shown in fig. 1 to 6, when the device starts to work, water enters the water inlet pipe 9, flows into the water accumulation cavity 2 in the box body 1, then the water flow height in the water accumulation cavity 2 rises, so that the judging component is driven to move in position, when the water flow height reaches a high liquid level, the judging component can cooperatively move with the switching component, then the water pump 4 is started, the water pump 4 pumps water out of the water accumulation cavity 2 through the water outlet pipe 5, when the water level height in the water accumulation cavity 2 reaches a low liquid level, the switching component stops working, then the water pump 4 stops working, so that when the water in the water accumulation cavity 2 reaches a high liquid level, the water pump 4 is started automatically, when the water level is low, The effect of stopping the water pump 4. When water flows in the water accumulation cavity 2, the buoy 12 on one side of the sliding plate 10 begins to float on the water surface under the influence of the water flow height, the height of the buoy is changed along with the change of the water flow height, when the water flow height reaches a certain value, the buoy 12 is influenced by the buoyancy of the water surface, the sliding plate 10 starts to move together, at the moment, the sliding plate 10 drives the conductive column 19 on one side to move upwards through the connecting rod 13 and the rotating rod 17, the conductive column 19 is always connected with the judging part, when the water flow height in the water accumulation cavity 2 reaches a certain height, the switching part is electrified, the conductive column 19 is electrified, and the current is led into the relay because the relay is in the prior art, So the relay is electrified, the water pump 4 starts to pump water through the water outlet pipeline 5, when the water level reaches a low liquid level, the switch component is disconnected, no current passes through the relay, and the water pump 4 stops working at the moment, so that the effects of automatically starting the water pump 4 when the water in the water accumulation cavity 2 reaches a high liquid level and stopping the water pump 4 when the water level reaches a low liquid level are achieved. The reason why the rotation angle of the rotating lever 17 is limited is that in actual operation, if the rotation angle of the rotating lever 17 is too large, it is impossible to precisely control the height of the water surface in the water accumulation chamber 2. When the water surface height in the water accumulation cavity 2 is too high, the normal work of the water pump 4 is affected, and the working efficiency is reduced; when the water level in the water accumulation cavity 2 is too low, the water pump 4 can continue to work, and the working efficiency can be reduced. Therefore, by limiting the rotation angle of the rotating rod 17, the height of the water surface in the water accumulation cavity 2 can be accurately controlled in the working process, so that the normal work of the water pump 4 is ensured, and the working efficiency is improved. when the water surface is at a low liquid level, the conductive column 19 is located in the area A, when the slide plate 10 drives the conductive column 19 to move upwards to reach a high liquid level, the conductive column 19 moves upwards along the area A, when the conductive column 19 reaches the high liquid level, the conductive column 19 passes through the point C, at the moment, the position of the conductive column 19 reaches the area B, because the area B of the conductive plate 23 is in a conductive state, current flows into the conductive column 19 through the area B, so that the relay is electrified, the water pump 4 starts to work, the water pump 4 pumps water, the water surface level can be lowered, the conductive column 19 only moves downwards along the area B, because the area B is always conductive, the water pump 4 can always work, when the water surface reaches the low liquid level, the conducting column 19 reaches the area A through the point D, no current passes through the relay at this time, and the water pump 4 stops working. When the switch of the control panel 8 is in a closed state, at this time, the electromagnet 24 is electrified to firmly attract the magnet, so that the baffle 22 cannot be opened due to the pressure of water flow, when the control panel 8 is opened, the electromagnet 24 is powered off, the baffle 22 can be opened due to the overlarge pressure of water flow, water outlet work is performed, and therefore the height of the water surface in the water accumulation cavity 2 can be controlled manually. The buoy 12 is arranged at a certain gap from the bottom of the box body 1, so that the bottom of the buoy 12 can be prevented from being stained with impurities such as dirt deposited in water at the bottom of the box body 1, and the working efficiency of the device is not affected. The scale 26 is arranged at the top of the slide plate 10, so that the liquid level on the water surface can be observed more conveniently, and the slide plate 10 can change along with the change of the liquid level on the water surface, so that a worker can observe the liquid level on the water surface more clearly and conveniently, and the working efficiency is greatly improved.

The foregoing utility model has been generally described in great detail, but it will be apparent to those skilled in the art that modifications and improvements can be made thereto. Accordingly, it is intended to cover modifications or improvements within the spirit of the inventive concepts.

Claims (7)

1. An automatic water pumping device for a pool comprises a box body (1); the method is characterized in that: be provided with ponding chamber (2) and reaction chamber (3) in box (1), the box (1) outside is provided with water pump (4), the one end of water pump (4) is connected with ponding chamber (2) through outlet conduit (5), be provided with the judgement part that is used for judging the water level height in box (1), the inside switch part that is used for switching on and off water pump (4) that is provided with of reaction chamber (3), be provided with baffle (6) in box (1), set up fluted (7) on baffle (6), one side fixedly connected with control panel (8) of box (1), one side of box (1) is provided with inlet channel (9), be connected with the relay between water pump (4) and the judgement part.

2. The automatic pumping device for a pool according to claim 1, wherein: the utility model provides a judging part includes slide (10), spout (11) have been seted up to one side of slide (10), be provided with buoy (12) in box (1), one side fixed connection of buoy (12) is provided with connecting rod (13), one side of connecting rod (13) is provided with slider (14), one side that buoy (12) was kept away from to slide (10) is provided with connecting plate (15), fixed connection is provided with back shaft (16) on connecting plate (15), be provided with bull stick (17) in reaction chamber (3), bull stick (17) are connected with back shaft (16) rotation, fixedly connected with jackshaft (18) on bull stick (17), sliding connection has conducting post (19) on jackshaft (18), be provided with spring (20) between conducting post (19) and bull stick (17), one end and conducting post (19) fixed connection of spring (20), the other end and bull stick (17) fixed connection of conducting post (19) keep away from spring (20), one end and judging part and relay (19) are passed through electric connection.

3. An automatic water pumping device for a pool according to claim 2, wherein: the switch component comprises a conducting plate (23), the conducting plate (23) is fixedly connected with the box body (1), the conducting plate is equally divided into an area A and an area B, a point C and a point D are respectively arranged on the conducting plate (23), the point C and the point D are both convex, the area B is conductive, and the outer side of the conducting plate (23) is insulated.

4. An automatic water pumping device for a pool according to claim 3, wherein: one side of box (1) is provided with delivery port (21), delivery port (21) department is provided with baffle (22), baffle (22) are connected with box (1) rotation, the inside fixed connection of baffle (22) is provided with magnet, fixed connection is provided with electro-magnet (24) on box (1) of baffle (22) below.

5. The automatic pumping device for a pool according to claim 4, wherein: the rotation angle of the rotating rod (17) is limited to a certain degree.

6. The automatic pumping device for a pool according to claim 5, wherein: the chute (11) is arranged in the middle of the sliding plate (10), and a certain gap is reserved between the buoy (12) and the bottom of the box body (1).

7. The automatic pumping device for a pool according to claim 6, wherein: the box body (1) is provided with a slide hole (25), the slide plate (10) is in sliding connection with the slide hole (25), and a scale (26) is arranged at the position, close to the top, of the slide plate (10).