Rapid and accurate adjusting device for microscope objective table

Abstract

The invention discloses a rapid and accurate adjusting device for a microscope objective table. The rapid and accurate adjusting device comprises a cylindrical base, a levelness adjusting assembly is arranged on the base, an adjusting seat is arranged on the upper side of the base, an adjusting groove is formed in the upper surface of the adjusting seat, a magnetic block II is placed on the inner side of the adjusting groove, and an adjusting table is fixedly arranged on the upper surface of the magnetic block II; a cavity is formed in the adjusting seat, a universal joint II is fixedly arranged in the center of the upper surface of the interior of the cavity, a telescopic rod is arranged on a universal ball of the universal joint II, the top end of the telescopic rod is connected with a universal ball of a universal joint IV, the universal ball of the universal joint IV is arranged on the lower side, and a magnetic block I is fixedly arranged on the upper surface of the universal joint IV. According to the device, the adjusting table can be rapidly and accurately adjusted in place at a time, an observation object on the objective table can be rapidly moved to an observation position, the part needing to be observed emphatically can be conveniently observed, the driving assembly is adjusted and controlled through the hinged control panel, adjustment is easy, and operation is easy.

Description

Technical Field

[0001] The invention relates to the technical field of microscopes, in particular to a device for quickly and accurately adjusting a microscope stage. Background Art

[0002] As an important optical instrument, microscopes are widely used in many fields such as scientific research, medical diagnosis and material analysis. With the development of science and technology, the exploration of the microscopic world is becoming more and more in-depth, and the requirements for microscopic observation are also increasing. Among them, the microscope stage is one of the key components for carrying samples for observation, and its performance directly affects the efficiency and quality of the entire observation process.

[0003] The stage equipped with most microscopes on the market is usually adjusted manually, including using mechanical structures such as knobs or sliders to move in the X-axis (left and right) and Y-axis (front and back) directions. When adjusting, it is necessary to move once in the X-axis (left and right) and Y-axis (front and back) directions respectively to move the stage into place. When the observation area needs to be changed frequently, it will be very inconvenient, and the adjustment position is not accurate enough, and it often needs to be moved multiple times, which reduces work efficiency. To this end, we propose a fast and precise adjustment device for the microscope stage. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the existing defects and provide a microscope stage rapid and precise adjustment device, which can make the adjustment platform quickly and accurately adjusted into place at one time, so that the observation object on the stage can be quickly moved to the observation position, which is convenient for observing the part that needs to be focused on. The drive component is adjusted and controlled by a hinged control panel, which is easy to adjust and simple to operate, improves work efficiency, and can effectively solve the problems in the background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a device for rapid and precise adjustment of a microscope stage, comprising a cylindrical base, a horizontal adjustment component is arranged on the base, an adjustment seat is arranged on the upper side of the base, an adjustment groove is opened on the upper surface of the adjustment seat, a magnetic block II is placed inside the adjustment groove, and an adjustment platform is fixedly arranged on the upper surface of the magnetic block II; a cavity is opened inside the adjustment seat, a universal joint II is fixedly arranged at the center of the inner upper surface of the cavity, a telescopic rod is arranged on the universal ball of the universal joint II, the top of the telescopic rod is connected to the universal ball of the universal joint IV, the universal ball of the universal joint IV is arranged on the lower side, and a magnetic block I is fixedly arranged on the upper surface of the universal joint IV, the magnetic block II and the magnetic block I are magnetically connected to each other via an upper partition between the adjustment groove and the cavity, a driving component for driving the telescopic rod to move is arranged on the rear side plate of the adjustment seat, and a control panel for controlling the driving component is hingedly arranged on the lower part of the side surface of the base.

[0006] As a preferred technical solution of the present invention, a plurality of grooves are evenly arranged in a circular array on the outer side of the upper surface of the base, and the level adjustment assembly includes a plurality of electric push rods Ⅰ installed in the plurality of grooves, a universal joint Ⅰ is fixedly arranged on the top of the movable end of the electric push rod Ⅰ, a connecting rod is arranged on the universal ball of the universal joint Ⅰ, and the top end of the connecting rod is hinged to the upper surface of the adjustment seat.

[0007] As a preferred technical solution of the present invention, a plurality of three-axis tilt sensors are evenly arranged on the lower surface of the adjustment seat.

[0008] As a preferred technical solution of the present invention, the telescopic rod includes a fixed tube arranged on universal joint II and a sliding rod arranged on universal joint IV, the sliding rod is slidably arranged in the fixed tube, and a compression spring connected to the end of the sliding rod is arranged on the inner side of the fixed tube.

[0009] As a preferred technical solution of the present invention, the driving assembly includes a driving motor installed on the outer surface of the rear side plate, and the inner surface of the rear side plate located in the cavity is provided with a slide groove, a driving screw is rotatably arranged in the slide groove, the output shaft of the driving motor penetrates into the slide groove and is connected to the driving screw through a coupling, a slider is slidably arranged in the slide groove, the driving screw is threadedly connected to the screw hole provided on the side surface of the slider, an electric push rod II is hingedly arranged on the side surface of the slider, a sleeve is movably sleeved on the outer surface of the fixed cylinder, a universal joint III is fixedly arranged on the outer surface of the sleeve, and the movable end of the electric push rod II is connected to the universal ball of the universal joint III.

[0010] As a preferred technical solution of the present invention, a plurality of ball grooves are evenly formed on the inner peripheral surface of the sleeve, and balls are arranged in the ball grooves.

[0011] As a preferred technical solution of the present invention, a spring is arranged in the ball groove, and the end of the spring is movably sleeved on the outside of the ball.

[0012] As a preferred technical solution of the present invention, a limit block corresponding to the sleeve is fixedly provided on the outer surface of the end of the fixed cylinder away from the universal joint II.

[0013] As a preferred technical solution of the present invention, two distance measuring sensors I corresponding to the slider are symmetrically arranged on the inner two side surfaces of the slide groove, and a plurality of distance measuring sensors II corresponding to the sleeve are evenly arranged on the fixed end side surface of the electric push rod II.

[0014] As a preferred technical solution of the present invention, a control groove is provided on the upper surface of the control board, the bottom surface of the control groove is a stainless steel plate, a magnetic block III is magnetically connected in the control groove, and a plurality of detection holes are evenly provided on the inner surface of the control groove, and a proximity switch is arranged in each detection hole.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: by moving the magnetic block I, the magnetic block II is driven to move, thereby driving the adjustment platform to move into place in the adjustment slot; since a universal joint is respectively arranged at both ends of the telescopic rod, the telescopic rod can be quickly moved in any direction in the plane when driven by the driving component, thereby enabling the adjustment platform to be quickly and accurately adjusted into place at one time, so that the observation object on the stage can be quickly moved to the observation position, which is convenient for observing the part that needs to be focused on; the driving component is adjusted and controlled by the hinged control panel, which is easy to adjust and simple to operate, thereby improving work efficiency; the level adjustment component arranged on the base can quickly adjust the level of the adjustment seat, and the microscope can be quickly put into work after being moved as a whole, thereby further improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a structural schematic diagram of the base of the present invention; Figure 3 It is a schematic diagram of a partial cross-sectional structure of the base of the present invention; Figure 4 It is a schematic diagram of the partial structure of the adjustment seat of the present invention; Figure 5 For the present invention Figure 4 A schematic diagram of the structure at A; Figure 6 It is a schematic diagram of the internal structure of the sleeve of the present invention; Figure 7 It is a structural schematic diagram of the control panel of the present invention.

[0017] In the figure: 1 base, 101 universal joint I, 102 connecting rod, 103 electric push rod I, 104 groove, 2 adjustment seat, 201 rear side plate, 202 universal joint II, 203 fixed cylinder, 204 slide bar, 205 magnetic block I, 206 driving motor, 207 slide groove, 208 slider, 209 driving screw, 210 hinge seat, 211 electric push rod II, 212 universal joint III, 213 sleeve, 214 limit block, 215 distance sensor I, 216 distance sensor II, 217 ball groove, 218 ball, 219 spring, 220 universal joint IV, 3 adjustment groove, 4 adjustment table, 5 magnetic block II, 6 control board, 601 control groove, 602 magnetic block III, 603 detection hole, 7 three-axis inclination sensor. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] See also Figure 1-7 The present invention provides a technical solution: a device for quickly and accurately adjusting a microscope stage, comprising a cylindrical base 1, on which a level adjustment component is arranged, and an adjustment seat 2 is arranged on the upper side of the base 1. The level adjustment component can be used to quickly adjust the level of the adjustment seat 2, and the microscope can be quickly put into work after being moved as a whole, thereby further improving work efficiency.

[0020] Specifically, a plurality of grooves 104 are evenly arranged in a circular array on the outer side of the upper surface of the base 1. The level adjustment assembly includes a plurality of electric push rods Ⅰ103 installed in the plurality of grooves 104. A universal joint Ⅰ101 is fixedly arranged on the top of the movable end of the electric push rod Ⅰ103. A connecting rod 102 is arranged on the universal ball of the universal joint Ⅰ101. The top of the connecting rod 102 is hinged to the upper surface of the adjustment seat 2. A plurality of three-axis inclination sensors 7 are evenly arranged on the lower surface of the adjustment seat 2. The three-axis inclination sensors 7 and the electric push rods Ⅰ103 are electrically connected to an external controller. The processor can select a commonly used PLC controller, such as a Siemens S7-200 series PLC controller, or a commonly used single-chip microcomputer and other microprocessors. The horizontality of the adjustment seat 2 is detected by the three-axis inclination sensor 7, and the corresponding signal is transmitted to the controller. The controller analyzes and determines its tilt direction and controls the corresponding electric push rod Ⅰ103 to rise and fall, thereby intelligently adjusting the horizontality of the adjustment seat 2. During the adjustment process, each three-axis inclination sensor 7 continuously detects the horizontality of the adjustment seat 2 and transmits the corresponding signal to the controller until the controller determines that the adjustment is in place and then closes the electric push rod Ⅰ103. The operation is simple and the adjustment is convenient.

[0021] Before using the microscope each time, the adjustment base 2 is adjusted by the three-axis tilt sensor 7 and the electric push rod Ⅰ103 to ensure the levelness of the stage and the accuracy of the observation results. An indicator light or display screen electrically connected to the controller can also be set on the outside to enable the operator to understand the levelness of the adjustment base 2 at any time and make corresponding adjustments.

[0022] The hinge direction between the connecting rod 102 and the adjustment seat 2 is radial, that is, except for the two connecting rods 102 on the same diameter having the same rotatable direction, the rotatable direction of the other connecting rods 102 is different, so that the adjustment seat 2 can be flexibly adjusted in multiple directions with the cooperation of each electric push rod Ⅰ103 and the universal joint Ⅰ101, so that it can cope with different tilt states and can be quickly adjusted to a horizontal state after the microscope is moved.

[0023] An adjustment slot 3 is provided on the upper surface of the adjustment seat 2, a magnetic block II 5 is placed inside the adjustment slot 3, an adjustment platform 4 is fixedly provided on the upper surface of the magnetic block II 5, and a cavity is provided inside the adjustment seat 2, a universal joint II 202 is fixedly provided at the center of the inner upper surface of the cavity, a telescopic rod is provided on the universal ball of the universal joint II 202, the top of the telescopic rod is connected to the universal ball of the universal joint IV 220, the universal ball of the universal joint IV 220 is arranged on the lower side, and a magnetic block I 205 is fixedly provided on the upper surface of the universal joint IV 220, the magnetic block II 5 and the magnetic block I 205 are magnetically connected to each other through the upper partition between the adjustment slot 3 and the cavity, and a telescopic rod for driving the telescopic rod is provided on the rear side plate 201 of the adjustment seat 2. The driving assembly for moving the telescopic rod is hingedly provided with a control panel 6 for controlling the driving assembly at the lower part of the side surface of the base 1. The magnetic block Ⅰ205 is moved to drive the magnetic block Ⅱ5 to move, thereby driving the adjustment platform 4 to move into place in the adjustment slot 3. Since a universal joint is respectively provided at both ends of the telescopic rod, the telescopic rod can move quickly in any direction in the plane when driven by the driving assembly, so that the adjustment platform 4 can be quickly and accurately adjusted into place at one time, so that the observation object on the stage can be quickly moved to the observation position, which is convenient for observing the part that needs to be observed. The driving assembly is adjusted and controlled by the hinged control panel 6, which is easy to adjust and simple to operate, thereby improving work efficiency.

[0024] The preferred technical solution is that the telescopic rod includes a fixed cylinder 203 arranged on the universal joint II 202 and a slide bar 204 arranged on the universal joint IV 220. The slide bar 204 is slidably arranged in the fixed cylinder 203, and a compression spring connected to the end of the slide bar 204 is arranged on the inner side of the fixed cylinder 203. When the fixed cylinder 203 and the slide bar 204 are arbitrarily rotated in multiple directions in the cavity to adjust the position of the magnetic block I 205, the slide bar 204 continuously slides and retracts in the fixed cylinder 203 to compress the compression spring. The compression spring ensures that the slide bar 204 always has a tendency to move upward through elastic force, thereby ensuring that the slide bar 204 always pushes the magnetic block I 205 against the lower side of the upper partition of the cavity and is magnetically connected to the magnetic block II 5.

[0025] The preferred technical solution is that the drive assembly includes a drive motor 206 installed on the outer surface of the rear side plate 201, and a slide groove 207 is provided on the inner surface of the rear side plate 201 located in the cavity, and a drive screw 209 is rotatably provided in the slide groove 207. The output shaft of the drive motor 206 penetrates into the slide groove 207 and is connected to the drive screw 209 through a coupling. A slider 208 is slidably provided in the slide groove 207, and the drive screw 209 is threadedly connected to a screw hole provided on the side surface of the slider 208. The side surface of the slider 208 is hingedly provided with an electric push rod II 211, and the outer surface of the fixed cylinder 203 is movably sleeved with a sleeve 213, and the outer surface of the sleeve 213 is fixedly provided with a universal joint Ⅲ212, the movable end of the electric push rod Ⅱ211 is connected to the universal ball of the universal joint Ⅲ212, and the driving motor 206 drives the slider 208 to move in the slide groove 207 through the driving screw 209, thereby driving the electric push rod Ⅱ211 and the sleeve 213 and the telescopic rod to move left and right in the horizontal direction, and the electric push rod Ⅱ211 drives the sleeve 213 and the telescopic rod to move back and forth in the horizontal direction through its telescopic movement. Through the coordinated driving of the driving motor 206 and the electric push rod Ⅱ211, the telescopic rod drives the magnetic block Ⅰ205 to move quickly in any direction on the horizontal plane, thereby realizing the quick and accurate one-time adjustment of the adjustment table 4, which greatly improves the working efficiency and makes the microscope more convenient to use.

[0026] Although the drive motor 206 and the electric push rod II 211 can only move in the left and right or front and back directions respectively, since the drive motor 206 and the electric push rod II 211 can move simultaneously, the oblique movement of the telescopic rod at any angle is realized, and the traditional at least two movements are transformed into only one precise movement.

[0027] The preferred technical solution is that the upper surface of the control board 6 is provided with a control slot 601, the bottom surface of the control slot 601 is a stainless steel plate, and a magnetic block III 602 is magnetically connected in the control slot 601. The position of the magnetic block III 602 corresponds to the position of the magnetic block I 205 and the magnetic block II 5, and a plurality of detection holes 603 are evenly provided on the inner surface of the control slot 601, and a proximity switch is provided in each detection hole 603, and the proximity switches are electrically connected to the controller. Each time the magnetic block III 602 moves in the control slot 601, it blocks a plurality of detection holes 603, thereby triggering the detection hole 6 The proximity switches in 03, the detection holes 603 and the proximity switches are distributed in an array, and each proximity switch represents a coordinate position. The controller determines the position of the magnetic block III 603 at this time according to the position and number of the triggered proximity switches, and then controls the drive motor 206 and the electric push rod II 211 to drive the telescopic rod to move a corresponding distance through the sleeve 213, thereby moving the magnetic block I 205 to the corresponding position. The magnetic block I 205 drives the adjustment platform 4 to move and position accurately through the magnetic block II 5, so that the observation object on the stage can be quickly moved to the observation position, which is convenient for observing the part that needs to be focused on.

[0028] In addition, the control panel 6 is hinged on the base 1 and can be rotated to a vertical state when not in use, thereby reducing space occupancy and facilitating the transportation of the microscope. At the same time, it can also provide a dust-proof effect for the control slot 601 and the detection hole 603. When in use, it can be rotated to a horizontal state to facilitate the operator's control and adjustment, making it more convenient to use.

[0029] A preferred technical solution is that a plurality of ball grooves 217 are evenly formed on the inner circumferential surface of the sleeve 213, and balls 218 are arranged in the ball grooves 217, so that the sleeve 213 can quickly and arbitrarily rotate and slide up and down during the movement of the telescopic rod, thereby facilitating the adjustment of the telescopic rod; a spring 219 is arranged in the ball groove 217, and the end of the spring 219 is movably sleeved on the outside of the ball 218. During the movement of the telescopic rod, the sleeve 213 is pulled by the electric push rod II 211, and the ball 218 compresses the spring 219, which can play a buffering and shock-absorbing role on the ball 218 and the telescopic rod.

[0030] An optional technical solution is that a limit block 214 corresponding to the sleeve 213 is fixedly provided on the outer surface of the end of the fixed cylinder 203 away from the universal joint II 202, and the diameter of the limit block 214 is larger than the inner diameter of the sleeve 213, which is used to limit it and prevent it from slipping out of the fixed cylinder 203.

[0031] An optional technical solution, wherein two distance sensors I 215 corresponding to the slider 208 are symmetrically arranged on the inner two side surfaces of the slide 207, and a plurality of distance sensors II 216 corresponding to the sleeve 213 are evenly arranged on the fixed end side surface of the electric push rod II 211, and the distance sensors I 215 and II 216 are electrically connected to the controller, and the controller controls the electric push rod I 103, the drive motor 206, the electric push rod II 211, the proximity switch, the three-axis inclination sensor 7, the distance sensors I 215 and the distance sensors II 216. In the conventional method in the prior art, the distance sensor II can be selected as a laser distance sensor or an ultrasonic distance sensor, wherein the distance sensor I 215 is used to detect the distance between the slider 208 and the two side walls of the slide groove 207, and the distance sensor II 216 is used to detect the distance between the fixed end of the electric push rod II 211 and the sleeve 213, and transmit the corresponding signal to the controller. The controller determines the specific position of the sleeve according to the detection value of the distance sensor, thereby feedback-controlling the switch of the drive motor 206 and the electric push rod II 211, and more accurately controlling the moving position of the adjustment platform 4.

[0032] Further optionally, a number of detection holes distributed in an array may be evenly opened on the upper surface of the adjustment slot 3 and proximity switches may be arranged in the detection holes. The proximity switches have the same function as the proximity switches on the control board 601 and are also electrically connected to the controller. The controller may determine whether the adjustment is in place and perform fine adjustments based on the position and number of proximity switches triggered by the magnetic block II 5, thereby further improving the accuracy of the adjustment.

[0033] The electric push rod I103, drive motor 206, electric push rod II211, proximity switch, three-axis inclination sensor 7, distance sensor I215 and distance sensor II216 and controller used in this application are all commonly used electronic components in the prior art, and their specific structures, working principles and circuit connections are all well-known technologies.

[0034] The undisclosed parts in the present invention are all prior art, and their specific structures, materials and working principles are not described in detail. Although the embodiments of the present invention have been shown and described, it is understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A device for quickly and accurately adjusting a microscope stage, comprising a cylindrical base (1), characterized in that: The base (1) is provided with a level adjustment component, an adjustment seat (2) is provided on the upper side of the base (1), an adjustment groove (3) is provided on the upper surface of the adjustment seat (2), a magnetic block II (5) is placed inside the adjustment groove (3), and an adjustment platform (4) is fixedly provided on the upper surface of the magnetic block II (5); a cavity is provided inside the adjustment seat (2), a universal joint II (202) is fixedly provided at the center of the inner upper surface of the cavity, a telescopic rod is provided on the universal ball of the universal joint II (202), and the top end of the telescopic rod is connected to the universal ball. The universal ball of the universal joint IV (220) is connected, the universal ball of the universal joint IV (220) is arranged at the lower side, and a magnetic block I (205) is fixedly arranged on the upper surface of the universal joint IV (220), the magnetic block II (5) and the magnetic block I (205) are magnetically connected to each other via an upper partition between the adjustment groove (3) and the cavity, a driving component for driving the telescopic rod to move is arranged on the rear side plate (201) of the adjustment seat (2), and a control panel (6) for controlling the driving component is hingedly arranged on the lower part of the side surface of the base (1).

2. A device for rapid and precise adjustment of a microscope stage according to claim 1, characterized in that: A plurality of grooves (104) are evenly arranged in a circular array on the outer side of the upper surface of the base (1). The level adjustment assembly comprises a plurality of electric push rods I (103) installed in the plurality of grooves (104). A universal joint I (101) is fixedly arranged on the top of the movable end of the electric push rod I (103). A connecting rod (102) is arranged on the universal ball of the universal joint I (101). The top of the connecting rod (102) is hinged to the upper surface of the adjustment seat (2).

3. A device for rapid and precise adjustment of a microscope stage according to claim 2, characterized in that: A plurality of three-axis tilt sensors (7) are evenly arranged on the lower surface of the adjustment seat (2).

4. The device for rapid and precise adjustment of a microscope stage according to claim 1, characterized in that: The telescopic rod comprises a fixed cylinder (203) arranged on a universal joint II (202) and a sliding rod (204) arranged on a universal joint IV (220); the sliding rod (204) is slidably arranged in the fixed cylinder (203), and a compression spring connected to an end of the sliding rod (204) is arranged inside the fixed cylinder (203).

5. A device for rapid and precise adjustment of a microscope stage according to claim 4, characterized in that: The driving assembly comprises a driving motor (206) mounted on the outer surface of the rear side plate (201); a slide groove (207) is provided on the inner surface of the rear side plate (201) located in the cavity; a driving screw rod (209) is rotatably provided in the slide groove (207); an output shaft of the driving motor (206) penetrates into the slide groove (207) and is connected to the driving screw rod (209) via a coupling; a slider (208) is slidably provided in the slide groove (207); the driving screw rod (209) is threadedly connected to a screw hole provided on the side surface of the slider (208); an electric push rod II (211) is hingedly provided on the side surface of the slider (208); a sleeve (213) is movably sleeved on the outer surface of the fixed cylinder (203); a universal joint III (212) is fixedly provided on the outer surface of the sleeve (213); and a movable end of the electric push rod II (211) is connected to the universal ball of the universal joint III (212).

6. A device for rapid and precise adjustment of a microscope stage according to claim 5, characterized in that: A plurality of ball grooves (217) are evenly formed on the inner peripheral surface of the sleeve (213), and balls (218) are arranged in the ball grooves (217).

7. A device for rapid and precise adjustment of a microscope stage according to claim 6, characterized in that: A spring (219) is disposed in the ball groove (217), and an end of the spring (219) is movably sleeved on the outside of the ball (218).

8. The device for rapid and precise adjustment of a microscope stage according to claim 5, characterized in that: A limiting block (214) corresponding to the sleeve (213) is fixedly provided on the outer surface of the end portion of the fixed cylinder (203) away from the universal joint II (202).

9. The device for rapid and precise adjustment of a microscope stage according to claim 5, characterized in that: Two distance measuring sensors I (215) corresponding to the slider (208) are symmetrically arranged on both side surfaces inside the slide groove (207), and a plurality of distance measuring sensors II (216) corresponding to the sleeve (213) are evenly arranged on the fixed end side surface of the electric push rod II (211).

10. The device for rapid and precise adjustment of a microscope stage according to claim 1, characterized in that: The control plate (6) has a control groove (601) on its upper surface, the bottom surface of the control groove (601) is a stainless steel plate, a magnetic block III (602) is magnetically connected to the control groove (601), and a plurality of detection holes (603) are evenly arranged on the inner surface of the control groove (601), each detection hole (603) being provided with a proximity switch.

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