A lift table motor assembly position detection device and method

Abstract

This invention relates to the field of position detection technology, and more particularly to a position detection device and method for a height-adjustable table motor assembly. The device includes: a motor base on which a motor is mounted; an upper rotating rod driven by the motor; an upper base fixed to the bottom of the upper rod; a middle lead screw, one end of which extends into the upper rotating rod and slides within it, rotating synchronously with the upper rotating rod; a middle base rotatably mounted at the bottom of the middle rod, with its top fixed to the middle lead screw; a lower lead screw, one end of which extends into the middle lead screw and slides within it; a lower base fixed to the bottom of the lower rod and fixedly connected to the bottom of the lower lead screw; a middle winding reel fixed to the top of the middle rod; a detection rope, one end of which is free, extending from the free end through the upper base and the middle winding reel, and finally connecting the other end to the lower base; and a detector mounted on the motor base for detecting the position of the free end of the detection rope. This invention is effectively adaptable to the detection applications of folding table legs and can effectively reduce production and usage costs.

Description

Technical Field

[0001] This invention relates to the field of position detection technology, and in particular to a position detection device and method for a height-adjustable table motor assembly. Background Technology

[0002] To increase the adjustable height of the height-adjustable desk, it will now be designed with features such as... Figure 1 The two-stage folding table legs shown include a lower rod 03, a middle rod 02, and an upper rod 01 that are nested together from bottom to top. The upper rod 01 is connected to the tabletop, the middle rod 02 slides on the upper rod 01, and the lower rod 03 slides on the middle rod 02.

[0003] The motor assembly is the power mechanism used to drive the movement of the two-stage folding table legs. The motor assembly also requires a two-stage transmission mechanism to move the lower rod 03 and the middle rod 02 of the two-stage folding table legs. During normal movement, the movement amplitude of the transmission part in the motor assembly that drives the lower rod 03 and the middle rod 02 should be consistent, so that the relative distance between the lower rod 03 and the middle rod 02 changes synchronously with the movement distance between the middle rod 02 and the upper rod 01. However, if problems such as jamming occur in the transmission parts of the motor assembly, causing the lower rod 03 and the middle rod 02 to move asynchronously, subsequent problems can easily arise. For example, if the lower rod 03 jams and cannot extend, but can retract normally, the extension length and retraction length will be inconsistent, affecting the normal use of the lower rod 03.

[0004] In traditional detection methods, it is usually necessary to directly or indirectly detect the position of the transmission components that drive the middle rod 02 and the lower rod 03 through various sensors, and then calculate the distance of movement between them to determine whether the movement of the lower rod 03 and the middle rod 02 is synchronized. Since the space of the folding table legs is small and it is inconvenient to install sensors, and the transmission components are usually rotating parts such as lead screws, the sensor wires are easy to get tangled in the lead screws. Therefore, traditional position detection methods are costly and have poor reliability. Summary of the Invention

[0005] This invention provides a position detection device and method for a height-adjustable table motor assembly, which can effectively solve the problems in the background art.

[0006] The present invention provides a position detection device for a height-adjustable desk motor assembly, comprising: The motor mount is fixedly installed inside the upper rod; the motor is mounted on the motor mount. The upper rotating rod is driven to rotate by a motor inside the upper rod; The upper base is fixedly installed at the bottom of the upper rod; a threaded hole is provided in the center of the upper base. The middle lead screw has one end inserted into the upper rotating rod and slides inside the upper rotating rod, rotating synchronously with the upper rotating rod; the outer thread of the middle lead screw passes through the upper threaded hole. The middle base is rotatably mounted on the bottom of the middle rod, and its top is fixed to the middle lead screw; the middle base has a threaded hole in the center; The lower lead screw has one end inserted into the middle lead screw and slides inside the middle lead screw; the outer thread of the lower lead screw passes through the middle thread hole. The lower base is fixedly installed at the bottom of the lower rod and is fixedly connected to the bottom of the lower lead screw; The winding reel is fixedly installed on the top of the center rod; The detection rope has one end that extends into the upper rod, and it passes through the upper base and the middle winding reel in sequence, with the other end finally connected to the lower base. The detector, mounted on the motor mount, is used to detect the position of the free end of the detection rope.

[0007] Furthermore, it also includes: The sleeve is fixedly installed on the motor mount. The vertical block slides up and down inside the casing; The upper winding reel is fixedly mounted on the motor base and located above the sleeve; The free end of the test rope passes over the upper winding spool and then connects to the top of the plumb bob.

[0008] Furthermore, the detector includes an upper trigger and a lower trigger, both fixedly mounted on the motor mount, with the upper trigger positioned higher than the lower trigger.

[0009] Furthermore, the plumb block is equipped with an indicator plate that extends to the outside of the casing.

[0010] Furthermore, it also includes a conductive plate, which is fixedly installed on the outside of the sleeve; an arc-shaped vibration generating plate is provided on the conductive plate, and the vibration generating plate is in contact with the outer side of any rotating component in the motor assembly.

[0011] Furthermore, protrusions are provided on the inner side of the arc-shaped vibration generator.

[0012] Furthermore, multiple vertically extending guide grooves are provided on the outer side of the vertical block.

[0013] Furthermore, limiting protrusions are set around the center winding coil, and the limiting protrusions are higher than the center winding coil.

[0014] Furthermore, the motor base is fixedly equipped with multiple stabilizing blocks, which are cylindrical in structure and have their outer surfaces protruding beyond the outer surfaces of the motor base.

[0015] The present invention also provides a method for detecting the position of a height-adjustable desk motor assembly, using the height-adjustable desk motor assembly position detection device as described above, the steps of which include: Install the detection rope and detector on the motor assembly, and adjust the length of the detection rope so that the free end of the detection rope is within the detection range of the detector. When the motor assembly is working, it monitors the position of the free end of the detection rope in real time. If the movement of the free end of the detection rope exceeds the set threshold, the motor assembly will stop working immediately and an alarm will be issued.

[0016] The technical solution of this invention can achieve the following technical effects: This invention transforms the detection of the synchronization of two-stage folding motions into the detection of the free end of the detection rope by using a special winding method of the detection rope within the motor assembly. This greatly simplifies the structure of the detection device and the steps of the detection process, significantly reducing manufacturing and operating costs, and making the detection device more suitable for the use cases of folding table legs. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of a two-stage folding table leg in the background art; Figure 2 This is a cross-sectional view of the position detection device for the lifting table motor assembly in this invention; Figure 3 This is a schematic diagram of the position detection device for the lifting table motor assembly in this invention; Figure 4 This is a component exploded view of the position detection device for the lifting table motor assembly in this invention; Figure 5 Another view of the structural schematic diagram of the position detection device of the lifting table motor assembly in this invention (the motor is hidden); Figure 6 This is a schematic diagram of the first embodiment of the position detection device for the lifting table motor assembly in this invention; Figure 7 This is a schematic diagram of the second embodiment of the position detection device for the lifting table motor assembly in this invention; Figure 8 This is a schematic diagram of the normal extension of the position detection device of the lifting table motor assembly in this invention; Figure 9 This is a schematic diagram of the position detection device for the lifting table motor assembly in this invention when it is abnormally extended. Figure 10 This is a schematic diagram of the winding disc in the present invention; Figure 11 This is a side view of the winding disc in this invention.

[0019] Reference numerals: 01, Upper rod; 02, Middle rod; 03, Lower rod; 1, Motor base; 2, Motor; 3, Upper rotating rod; 4, Upper base; 5, Middle lead screw; 6, Middle base; 7, Lower lead screw; 8, Lower base; 9, Middle winding reel; 10, Detection rope; 11, Sleeve; 12, Plunger; 12a, Indicator plate; 13, Upper winding reel; 14, Upper trigger; 15, Lower trigger; 16, Conducting plate; 16a, Vibration generating plate; 17, Limiting protrusion; 18, Stabilizing block. Detailed Implementation

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0022] This invention relates to a position detection device for a height-adjustable table motor assembly, such as... Figures 2-5 As shown, it includes: Motor mount 1 is fixedly installed inside the upper rod 01; motor 2 is installed on motor mount 1; The upper rotating rod 3 is driven to rotate by the motor 2 inside the upper rod 01. The rotating shaft of the motor 2 can directly lock the upper rotating rod 3, or it can indirectly drive the upper rotating rod 3 through a transmission structure. Taking the implementation method in the figure as an example, the motor 2 and the upper rotating rod 3 are connected through a transmission structure. The rotating shaft of the motor 2 will drive the worm to rotate, and then the worm will drive the worm wheel to rotate. A gear is fixed on the back of the worm wheel and meshes with the gear at the top of the upper rotating rod 3, thereby forming a transmission. The upper base 4 is fixedly installed at the bottom of the upper rod 01; the upper base 4 has an upper threaded hole in the center; One end of the middle lead screw 5 extends into the upper rotating rod 3. This end is connected to the upper rotating rod 3 through a structure such as a square key or spline, so that this end can slide inside the upper rotating rod 3 and rotate synchronously with the upper rotating rod 3. The outer thread of the middle lead screw 5 passes through the upper threaded hole, and the outer thread of the middle lead screw 5 engages with the thread of the upper threaded hole. The middle base 6 is rotatably mounted on the bottom of the middle rod 02, and its top is fixed to the middle lead screw 5; the middle base 6 has a central threaded hole. The lower lead screw 7 has one end inserted into the middle lead screw 5 and slides inside the middle lead screw 5; the outer thread of the lower lead screw 7 passes through the middle thread hole. The lower base 8 is fixedly installed at the bottom of the lower rod 03 and is fixedly connected to the bottom of the lower lead screw 7; The middle winding reel 9 is fixedly installed on the top of the middle rod 02; no matter how much the two-stage folding table legs extend, the middle winding reel 9 must always be higher than the middle base 6; The detection rope 10 has one end that extends freely into the upper rod 01. The installation of the detection rope 10 is as follows: Figures 6-9 As shown, starting from the free end, it passes through the upper base 4 and the middle winding reel 9 in sequence, and finally the other end passes through the bottom of the middle rod 02 and is connected to the lower base 8; the entire detection rope 10 is located in the upper rod 01 and the middle rod 02 to avoid the detection rope 10 being exposed after the table legs are extended; The detector, mounted on the motor base 1, is used to detect the position of the free end of the detection rope 10.

[0023] The specific working process and principle of this device are as follows: When the table legs need to be extended or retracted, the starter motor 2 drives the upper rotating rod 3 to rotate, which in turn drives the middle lead screw 5 to rotate synchronously. The middle lead screw 5 then drives the middle base 6 to rotate, meaning that the upper rotating rod 3, the middle lead screw 5, and the middle base 6 will rotate together. Since the outer thread of the middle lead screw 5 engages with the upper threaded hole of the upper base 4, as the middle lead screw 5 rotates, a vertical relative movement will occur between the upper base 4 and the middle lead screw 5, thereby enabling the upper rod 01 and the middle rod 02 to unfold and fold. Since the outer thread of the lower lead screw 7 engages with the middle threaded hole of the middle base 6, as the middle base 6 rotates, a vertical relative movement will occur between the lower lead screw 7 and the middle base 6, thereby enabling the middle rod 02 and the lower rod 03 to unfold and fold.

[0024] As can be seen, since the upper rotating rod 3, the middle lead screw 5, and the middle base 6 all rotate synchronously, the unfolding and folding of the upper rod 01 and the middle rod 02, as well as the unfolding and folding of the middle rod 02 and the lower rod 03, will be synchronized, and the moving distances will be equal during normal operation. During testing, the main function of this device is to detect whether the moving distances of the two sets of folding structures are equal. To avoid the complex traditional method of first detecting the position of each rod and then calculating the moving distance, this device proposes a method that can directly detect the relative position of the two sets of folding structures. The specific detection principle is as follows: When the folding table legs are folded up, as Figure 7 As shown, let L1 be the length of the detection rope 10 located on the left side of the middle winding reel 9, between the lower base 8 and the middle winding reel 9; let L2 be the length of the detection rope 10 located on the right side of the middle winding reel 9, between the upper base 4 and the middle winding reel 9; and let L3 be the length of the detection rope 10 located inside the upper rod 01. Then the total length of the detection rope 10 is L1 + L2 + L3.

[0025] Now the folding table legs extend normally, such as Figure 8As shown, under normal circumstances, the relative movement distance between the upper rod 01 and the middle rod 02 is the same as the relative movement distance between the middle rod 02 and the lower rod 03, assuming both are k. Then the length of the detection rope 10 located on the left side of the middle winding reel 9 will become L1+k, and the length of the detection rope 10 located on the right side of the middle winding reel 9 will become L2-k. Thus, the length of the detection rope 10 located inside the upper rod 01 is the total length of the detection rope 10 (L1+L2+L3) minus the length of the detection rope 10 outside the upper rod 01 at this time ((L1+k)+(L2-k)). Calculating the length of the detection rope 10 located inside the upper rod 01, we find it is still L3. It can be seen that when the folding table legs are normally extended, the length of the detection rope 10 located inside the upper rod 01 remains unchanged, so the free end of the detection rope 10 will not move.

[0026] If the elongation distances of the two sets of folded structures are not consistent, such as Figure 9 As shown, assuming the relative movement distance between the upper rod 01 and the middle rod 02 is k1, and the relative movement distance between the middle rod 02 and the lower rod 03 is k2, then the length of the detection rope 10 located on the left side of the middle winding reel 9 will become L1+k1, and the length of the detection rope 10 located on the right side of the middle winding reel 9 will become L2-k2. Thus, the length of the detection rope 10 located inside the upper rod 01 is the total length of the detection rope 10 (L1+L2+L3) minus the length of the detection rope 10 outside the upper rod 01 at this time ((L1+k1)+(L2-k2)). Calculating the length of the detection rope 10 located inside the upper rod 01, we find that it becomes L3-k1+k2. It can be seen that the free end of the detection rope 10 will move at this time.

[0027] Now, by using a detector to check whether the free end of the detection rope 10 moves, it can be determined whether the various components in the motor assembly are in the correct position when the table legs are unfolded, and whether the two folded parts of the table legs are extended and unfolded synchronously.

[0028] During testing, the testing rope 10 needs to be kept taut to maintain constant contact with all parts of the winding. Therefore, the free end of the testing rope 10 cannot simply be placed in the upper rod 01; it needs to be taut using methods such as... Figure 6 The structure shown: A sleeve 11 is installed and fixedly mounted on the motor base 1; A vertical block 12 is installed, which slides up and down inside the sleeve 11; The free end of the detection rope 10 is connected to the plumb block 12; a spring is installed at the top of the plumb block 12, and the top of the spring is hung on the top of the upper rod 01 or the motor base 1. During operation, the spring is always in a stretched state. In this way, when the length of the detection rope 10 located in the upper rod 01 increases, the spring can pull the plumb block 12 upward to adapt to the increase in length. When the length of the detection rope 10 located in the upper rod 01 decreases, the detection rope 10 will pull the plumb block 12 downward to adapt to the decrease in length. The detector directly detects the position of the plumb block.

[0029] The above-described structure is relatively simple. However, to prevent the detection rope 10 from being too taut, the spring's elasticity cannot be too high. Since the spring needs to be continuously kept in a stretched state, its elasticity weakens with use, and its ability to return to its original shape after stretching decreases, thus affecting its performance. Therefore, this device also includes a second embodiment, such as... Figures 3-5 and Figure 7 As shown: A sleeve 11 is installed and fixedly mounted on the motor base 1; A vertical block 12 is provided, which slides up and down inside the sleeve 11; the vertical block 12 is a metal structure. The upper winding reel 13 is fixedly mounted on the motor base 1 and located above the sleeve 11; The free end of the detection rope 10 passes over the upper winding reel 13 and then connects to the top of the plumb block 12; This implementation utilizes the gravity of the plumb bob 12 to pull the detection rope 10 taut. This pulling force does not change over time, thus effectively extending the service life of the detection device.

[0030] The detector preferably includes an upper trigger 14 and a lower trigger 15, both fixedly mounted on the motor base 1. The upper trigger 14 is positioned higher than the lower trigger 15. The upper trigger 14 and the lower trigger 15 can be proximity switches or touch switches. Once the plumb block 12 reaches the upper trigger 14 and the lower trigger 15, they will trigger to generate an electrical signal, or close the touch switch to connect the circuit. The positions of the upper trigger 14 and the lower trigger 15 are the upper and lower limits of the movable plumb block 12, that is, the upper and lower limits of the movable free end of the detection rope 10. Once the upper trigger 14 or the lower trigger 15 is triggered, it indicates that the free end of the detection rope 10 has moved too much, that is, the degree of asynchrony between the two sets of folding structures exceeds the threshold, and an alarm needs to be triggered immediately.

[0031] To ensure the movement trajectory of the plumb block 12, the sleeve 11 covers the side of the plumb block 12, which affects the detector's detection. Furthermore, to increase the pulling force of the plumb block 12 on the detection rope 10, the plumb block 12 is designed to be large and tall. Directly detecting the plumb block 12 would result in a large distance between the upper trigger 14 and the lower trigger 15, especially since the lower trigger 15 needs to be inserted deep within the upper rod 01, making installation inconvenient. Therefore, it is preferable to provide an indicator piece 12a extending to the outside of the sleeve 11 on the plumb block 12. The detector reflects the position of the plumb block 12 by detecting the indicator piece 12a. The height of the indicator piece 12a does not need to be the same as the plumb block 12, thus significantly shortening the distance between the upper trigger 14 and the lower trigger 15, making installation easier.

[0032] If the sliding of the vertical block 12 within the sleeve 11 becomes stuck, it will severely affect the detection of this device. To avoid this sticking, it is preferable to include a conductive plate 16 in this device, which is fixedly installed on the outside of the sleeve 11. An arc-shaped vibration generator 16a is mounted on the conductive plate 16, and the vibration generator 16a is in contact with the outer surface of any rotating component in the motor assembly. The rotating component includes the rotating shaft of the motor 2, gears in the transmission structure between the motor 2 and the upper rotating rod 3, and the upper rotating rod 3 itself, etc. Figures 3-4 In the illustrated embodiment, the vibration generator 16a is attached to the worm gear driven by the rotating shaft of the motor 2. When the rotating component rotates, it generates friction on the vibration generator 16a, causing it to vibrate. The vibration is transmitted to the sleeve 11 along the transmission plate 16. Thus, if the vertical block 12 becomes stuck due to tilting, twisting, or other reasons, it can automatically return to its original position under the influence of vibration, ensuring the sliding of the vertical block 12. Preferably, a protrusion is provided on the inner arc of the vibration generator 16a so that the vibration generator 16a can fit against the rotating component, ensuring the smooth generation of vibration.

[0033] Preferably, multiple vertically extending guide grooves are provided on the outer side of the vertical block 12. The guide grooves can reduce the outer surface area of ​​the vertical block 12, thereby reducing the friction between the vertical block 12 and the sleeve 11 and ensuring the smooth movement of the vertical block 12.

[0034] Preferably, limiting protrusions 17 are provided around the middle winding reel 9. The limiting protrusions 17 are higher than the middle winding reel 9. The two sides of the limiting protrusions 17 will respectively stick to the outer side of the upper rod 01 and the inner wall of the middle rod 02, thereby leaving a certain space for the middle winding reel 9, so that the part of the detection rope 10 wound on the middle winding reel 9 will not be clamped by the upper rod 01 and the middle rod 02 and thus unable to slide.

[0035] It is preferable to fix multiple stabilizing blocks 18 at the four corners of the motor base 1, and the outer side of the stabilizing block 18 protrudes from the outer side of the motor base 1. The stabilizing block 18 can form an interference fit between the motor base 1 and the upper rod 01, thereby preventing the motor base 1 from shaking and affecting the normal operation of each component. The stabilizing block 18 is preferably set as a cylindrical structure, which can play a better guiding role when the motor base 1 is placed, and prevent the motor base 1 from tilting.

[0036] This invention also relates to a method for detecting the position of a height-adjustable desk motor assembly, using the aforementioned height-adjustable desk motor assembly position detection device, the steps of which include: Install the detection rope 10 and the detector on the motor assembly, and adjust the length of the detection rope 10 so that the free end of the detection rope 10 is within the detection range of the detector. When the motor assembly is working, the position of the free end of the detection rope 10 is detected in real time. If the movement of the free end of the detection rope 10 exceeds the set threshold, the motor assembly will stop working immediately and an alarm will be issued.

[0037] Although this application has been described in conjunction with specific features and embodiments, it is obvious that various modifications and combinations can be made thereto without departing from the spirit and scope of this application. Accordingly, this specification and drawings are merely exemplary illustrations of the application as defined herein, and are to be considered as covering any and all modifications, variations, combinations, or equivalents within the scope of this application. Clearly, those skilled in the art can make various alterations and modifications to this application without departing from its scope. Thus, if such modifications and modifications fall within the scope of this application and its equivalents, this application intends to include such modifications and modifications.

Claims

1. A position detection device for a lift table motor assembly, comprising: include: Motor mount (1) is fixedly installed inside the upper rod; The motor (2) is mounted on the motor mount (1); The upper rotating rod (3) is driven to rotate by the motor (2) inside the upper rod; The upper base (4) is fixedly installed at the bottom of the upper rod; the upper base (4) is provided with an upper threaded hole at its center; The middle lead screw (5) has one end inserted into the upper rotating rod (3) and slides inside the upper rotating rod (3), and rotates synchronously with the upper rotating rod (3); the outer thread of the middle lead screw (5) passes through the upper threaded hole; The middle base (6) is rotatably mounted on the bottom of the middle rod, and its top is fixed to the middle lead screw (5); the middle base (6) is provided with a central threaded hole; The lower lead screw (7) has one end inserted into the middle lead screw (5) and slides inside the middle lead screw (5); the outer thread of the lower lead screw (7) passes through the middle thread hole; The lower base (8) is fixedly installed at the bottom of the lower rod and is fixedly connected to the bottom of the lower lead screw (7); The winding reel (9) is fixedly installed on the top of the middle rod; The detection rope (10) has one end that extends into the upper rod and passes through the upper base (4) and the middle winding disc (9) in sequence from the free end, and finally the other end is connected to the lower base (8). A detector is installed on the motor base (1) for detecting the position of the free end of the detection rope (10); the detector includes an upper trigger (14) and a lower trigger (15) both fixedly installed on the motor base (1), with the upper trigger (14) positioned higher than the lower trigger (15); The sleeve (11) is fixedly installed on the motor base (1); The vertical block (12) slides up and down inside the sleeve (11); The upper winding spool (13) is fixedly mounted on the motor base (1) and located above the sleeve (11); The free end of the detection rope (10) passes over the upper winding spool (13) and then connects to the top of the plumb block (12); A conductive plate (16) is fixedly installed on the outside of the sleeve (11); an arc-shaped vibration generating plate (16a) is provided on the conductive plate (16), and the vibration generating plate (16a) is in contact with the outer side of any rotating component in the motor assembly.

2. The lift table motor assembly position detection device according to claim 1, wherein The vertical block (12) is provided with an indicator piece (12a) extending to the outside of the sleeve (11).

3. The lift table motor assembly position detection device according to claim 1, wherein The inner side of the vibration generating plate (16a) is provided with a protrusion.

4. The lift table motor assembly position detection device according to claim 1, characterized by, The outer side of the vertical block (12) is provided with multiple vertically extending guide grooves.

5. The lift table motor assembly position detection device according to claim 1, characterized by, The winding disc (9) is provided with limiting protrusions (17) around its perimeter, and the limiting protrusions (17) are higher than the winding disc (9).

6. The lift table motor assembly position detection device according to claim 1, wherein The motor base (1) is fixedly provided with multiple stabilizing blocks (18). The stabilizing blocks (18) have a cylindrical structure and the outer side of the stabilizing blocks (18) protrudes from the outer side of the motor base (1).

7. A method of detecting the position of a lift table motor assembly, the method comprising: Using the position detection device for the lifting table motor assembly as described in any one of claims 1 to 6, the steps include: Install the detection rope (10) and the detector on the motor assembly, and adjust the length of the detection rope (10) so that the free end of the detection rope (10) is within the detection range of the detector; When the motor assembly is working, the position of the free end of the detection rope (10) is detected in real time. If the movement of the free end of the detection rope (10) exceeds the set threshold, the motor assembly will stop working immediately and an alarm will be issued.

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