Length measuring equipment for high-specific-gravity elevator balance compensation chain with steel balls

Abstract

The invention belongs to the technical field of laser measurement, and particularly relates to a length measuring device for a high-specific-gravity elevator balance compensation chain with a steel ball, which comprises a base, an L-shaped support plate fixedly arranged at the top of the base, and a winding traction mechanism arranged at one side of the top of the base and used for winding and pulling a chain body. According to the invention, automatic traction and non-contact high-precision length measurement of the chain body can be realized, the labor intensity is reduced, and the influence of non-uniform manual traction force on the measurement continuity and precision is avoided; the chain body can be stably lifted and limited, it is guaranteed that the chain body passes through a detection area in a linear posture, and the accuracy of measured data is improved; impurities on the surface of the chain body and dust in the surrounding environment can be effectively cleaned, the impurities are prevented from blocking a detection light path or interfering a detection signal, the measurement precision and stability are further enhanced, meanwhile, the traction force of the chain body can be monitored in real time, the clamping force can be dynamically adjusted, and the chain body is prevented from being damaged due to overlarge stress.

Description

Technical Field

[0001] This invention belongs to the field of laser measurement technology, and in particular relates to a length measuring device for a high-density elevator balance compensation chain with steel balls. Background Technology

[0002] In elevator operating systems, the balance compensation chain is the core component for achieving dynamic weight balance between the car and the counterweight. Its performance directly determines the smoothness and safety of elevator operation. For scenarios with higher weight compensation requirements, such as high-rise elevators and freight elevators, the industry is gradually adopting high-density elevator balance compensation chains with steel balls. The length accuracy of these high-density elevator balance compensation chains with steel balls is the key to ensuring the effective functioning of their balancing function. Therefore, the length of the compensation chain must be accurately measured during production, installation, and maintenance.

[0003] With the development of measurement technology, laser measurement has been gradually applied to the length measurement of elevator balance compensation chains due to its advantages of non-contact and high precision. However, the weight per meter of the high-density balance compensation chain with steel balls is large, and to meet the needs of high-rise elevators, the length of a single chain can typically reach 60-120 meters. Existing laser measurement equipment often requires manual assistance to pull the chain through the measurement area, which is not only extremely labor-intensive, but also prone to fluctuations in the chain's movement speed due to uneven traction force, affecting the continuity and accuracy of laser measurement. Secondly, the high-density balance compensation chain with steel balls is prone to local bending due to its own weight (such as the chain drooping in the middle to form an arc), reducing the measurement accuracy.

[0004] To address this, a length measuring device for a high-density elevator balance compensation chain with steel balls is proposed. Summary of the Invention

[0005] The purpose of this invention is to address the above-mentioned problems by providing a length measuring device for a high-density elevator balance compensation chain with steel balls.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a length measuring device for a high-density elevator balance compensation chain with steel balls, comprising a base, wherein an L-shaped support plate is fixedly mounted on the top of the base, and further comprising:

[0007] A winding traction mechanism is provided on the top side of the base, and the winding traction mechanism is used to wind and pull the chain.

[0008] Multiple idlers are arranged in a straight line and rotate side by side on the bottom of the side wall of the L-shaped support plate. The top of the L-shaped support plate is provided with a self-adjusting clamping mechanism that cooperates with the multiple idlers.

[0009] The tension detection mechanism is installed on the side wall of the L-shaped support plate, and is located between the self-adjusting clamping mechanism and the winding traction mechanism. The tension detection mechanism and the self-adjusting clamping mechanism are linked and cooperate with each other.

[0010] The protective sleeve is fixedly installed on the side wall of the L-shaped support plate, and the protective sleeve is located between the self-adjusting clamping mechanism and the tension detection mechanism. The internal thread of the protective sleeve is equipped with a laser measurement sensor.

[0011] A cleaning mechanism is provided on the top of the base, and the cleaning mechanism is located on one side of the idler roller and the self-adjusting clamping mechanism;

[0012] The PLC controller is fixedly mounted on the side wall of the L-shaped support plate. The winding traction mechanism, self-adjusting clamping mechanism, tension detection mechanism, and cleaning mechanism are all electrically connected to the PLC controller.

[0013] Preferably, the winding traction mechanism includes two fixed plates symmetrically fixed on the top of the base, a winding wheel is provided between the two fixed plates, and the two sides of the winding wheel are rotatably connected to the two fixed plates through a rotating shaft. A motor is fixedly provided on the side of one of the fixed plates, and the output end of the motor is fixedly connected to one end of one of the rotating shafts.

[0014] Preferably, the self-adjusting pressing mechanism includes an electric push rod fixedly disposed on the top of the L-shaped support plate, an L-shaped moving plate fixedly disposed at the moving end of the electric push rod, and a plurality of pressure rollers arranged in a straight line on the side of the L-shaped moving plate.

[0015] Preferably, the tension detection mechanism includes a fixed seat fixedly disposed on the side of the L-shaped support plate, a fixed sleeve fixedly disposed at the bottom of the fixed seat, a movable rod slidably disposed inside the fixed sleeve, a tension roller rotatably disposed at the lower end of the movable rod, a pressure sensor fixedly disposed at the upper end of the movable rod, and a spring fixedly disposed between the top of the pressure sensor and the inner wall of the fixed sleeve.

[0016] Preferably, the roller walls of the tension roller, the pressure roller, and the idler roller are all concave arc-shaped surfaces. The number of idler rollers is the same as the number of pressure rollers, and the positions of the idler rollers and the pressure rollers are arranged in a one-to-one correspondence.

[0017] Preferably, the cleaning mechanism includes cleaning brushes fixedly mounted on one side of the idler roller and one side of the pressure roller. A support rod is fixedly mounted on the top of the base and on the side near the cleaning brush. An exhaust fan is fixedly mounted on the upper end of the support rod. An exhaust fan is fixedly mounted on the side of the exhaust fan away from the cleaning brush. A plurality of evenly distributed first exhaust holes are opened around the side of the exhaust fan near the cleaning brush. A filter screen is fixedly mounted inside the exhaust fan. An auxiliary exhaust mechanism extending between the idler roller and the pressure roller is provided on one side of the exhaust fan.

[0018] Preferably, the auxiliary exhaust mechanism includes an auxiliary exhaust pipe fixedly disposed on the side wall of the exhaust duct, and the end of the auxiliary exhaust pipe away from the exhaust duct adopts a closed structure, and the pipe wall of the auxiliary exhaust pipe has a plurality of evenly distributed second exhaust holes.

[0019] Preferably, a connecting shaft is fixedly provided on the side wall of one of the idlers, and the end of the connecting shaft away from the idler extends into the interior of the exhaust duct and is fixedly provided with a first gear. A transmission shaft is fixedly rotatably provided on the inner side wall of the exhaust duct, and a second gear is fixedly provided on the shaft wall of the transmission shaft. The first gear and the second gear are meshed together, and a cleaning scraper is fixedly provided at one end of the transmission shaft and is in contact with the surface of the filter screen.

[0020] Compared with existing technologies, the advantages of this invention are as follows:

[0021] 1. Through the set winding traction mechanism and laser measurement sensor, the motor in the winding traction mechanism drives the winding wheel to rotate at a uniform speed, providing a stable and consistent traction force for the chain. No manual assistance is required, which greatly reduces the labor intensity of workers and avoids fluctuations in the chain movement speed caused by uneven manual traction force. The laser measurement sensor can capture the chain movement signal in real time. With the timing and calculation functions of the PLC controller, it can accurately record the chain movement time and automatically convert the length, realizing non-contact, high-precision measurement of the chain length.

[0022] 2. Through the set idler rollers and self-adjusting clamping mechanism, the idler rollers are arranged in a straight line side by side. The roller wall adopts an inward arc surface, which can be adapted to the shape of the steel ball chain. It stably supports the chain from below and prevents the chain from shifting laterally or rolling. The electric push rod in the self-adjusting clamping mechanism can drive the pressure roller to move up and down. The pressure roller and the idler roller correspond one-to-one and also adopt an inward arc surface. They can fit against the chain from above to form a "coordinated clamping" structure. This not only effectively limits the chain, but also avoids the chain from sagging or bending locally due to its own weight or traction force. It ensures that the chain always passes through the detection area of ​​the laser measurement sensor in a straight line, eliminating the influence of bending on the measurement accuracy. At the same time, it can monitor the traction force of the chain in real time and dynamically adjust the clamping force to prevent the chain from being damaged due to excessive force.

[0023] 3. Through the set cleaning mechanism and auxiliary ventilation mechanism, the cleaning brush in the cleaning mechanism rotates synchronously with the idler roller and pressure roller, which can closely adhere to the surface of the chain, peel off and remove surface dust and debris, and prevent impurities from blocking the laser beam path; the ventilation tube and the exhaust fan form a negative pressure, and the dust raised during the cleaning process is sucked away in time through the first exhaust hole, and the built-in filter screen can filter and purify the dust-laden gas; at the same time, the auxiliary exhaust pipe of the auxiliary ventilation mechanism can suck up the trace dust generated by the friction between the chain and the roller through the second exhaust hole, and can also actively clean the air around the laser measurement sensor, reduce the interference of floating impurities on the laser signal reception, and further improve the measurement accuracy and stability. Attached Figure Description

[0024] Figure 1 This is a first-view perspective perspective view of a length measuring device for a high-density elevator balance compensation chain with steel balls provided by the present invention.

[0025] Figure 2 This is a second-view perspective perspective view of a length measuring device for a high-density elevator balance compensation chain with steel balls provided by the present invention.

[0026] Figure 3 This is a perspective view of the surface structure of the L-shaped support plate in a length measuring device for a high-density elevator balance compensation chain with steel balls provided by the present invention;

[0027] Figure 4 This is a perspective view of the tension detection mechanism in a length measuring device for a high-density elevator balance compensation chain with steel balls provided by the present invention;

[0028] Figure 5 This is a perspective view of the exterior of the exhaust duct in a length measuring device for a high-density elevator balance compensation chain with steel balls provided by the present invention.

[0029] Figure 6 This is a three-dimensional view of the exhaust duct in a length measuring device for a high-density elevator balance compensation chain with steel balls provided by the present invention.

[0030] In the diagram: 1. Base, 2. L-shaped support plate, 3. Winding traction mechanism, 31. Fixed plate, 32. Winding wheel, 33. Rotating shaft, 34. Motor, 4. Support roller, 5. Self-adjusting clamping mechanism, 51. Electric push rod, 52. L-shaped moving plate, 53. Pressure roller, 6. Tension detection mechanism, 61. Fixed seat, 62. Fixed sleeve, 63. Moving rod, 64. Tension roller, 65. Pressure sensor, 66. Spring, 7. Protective sleeve, 8. Laser measurement sensor, 9. Cleaning mechanism, 91. Cleaning brush, 92. Support rod, 93. Exhaust duct, 94. Exhaust fan, 95. First exhaust hole, 96. Filter screen, 97. Auxiliary exhaust mechanism, 971. Auxiliary exhaust pipe, 972. Second exhaust hole, 98. Connecting shaft, 99. First gear, 910. Transmission shaft, 911. Second gear, 912. Cleaning scraper, 10. PLC controller. Detailed Implementation

[0031] 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.

[0032] like Figures 1-6 As shown, a length measuring device for a high-density elevator balance compensation chain with steel balls includes a base 1, an L-shaped support plate 2 fixedly mounted on the top of the base 1, and further includes:

[0033] The winding traction mechanism 3 is located on one side of the top of the base 1 and is used to wind and pull the chain. The winding traction mechanism 3 includes two fixed plates 31 symmetrically fixed on the top of the base 1. A winding wheel 32 is provided between the two fixed plates 31, and the two sides of the winding wheel 32 are rotatably connected to the two fixed plates 31 through a rotating shaft 33. A motor 34 is fixedly provided on the side of one of the fixed plates 31, and the output end of the motor 34 is fixedly connected to one end of one of the rotating shafts 33. When the motor 34 runs at a constant speed, it will drive the rotating shaft 33 to rotate at a constant speed. The rotating shaft 33 drives the winding wheel 32 at the end to rotate synchronously. The winding wheel 32 generates a stable traction force on the chain through the hanging part. The middle of the rotating shafts 33 on both sides of the winding wheel 32 is detachably set by bolts and nuts, which can ensure that the winding wheel 32 can be disassembled and replaced.

[0034] Multiple rollers 4 are arranged in a straight line and rotate on the bottom of the side wall of the L-shaped support plate 2. The top of the L-shaped support plate 2 is provided with a self-adjusting pressing mechanism 5 that cooperates with the multiple rollers 4. The self-adjusting pressing mechanism 5 includes an electric push rod 51 fixedly installed on the top of the L-shaped support plate 2. An L-shaped moving plate 52 is fixedly installed at the moving end of the electric push rod 51. Multiple pressure rollers 53 arranged in a straight line and rotate on the side of the L-shaped moving plate 52. The moving end of the electric push rod 51 extends and retracts, causing the L-shaped moving plate 52 to move vertically downward or upward. At the same time, the multiple pressure rollers 53 on the side of the L-shaped moving plate 52 move downward or upward accordingly.

[0035] Tension detection mechanism 6 is installed on the side wall of L-shaped support plate 2, and is located between self-adjusting clamping mechanism 5 and winding traction mechanism 3. Tension detection mechanism 6 and self-adjusting clamping mechanism 5 are linked and cooperated. Tension detection mechanism 6 includes a fixed seat 61 fixedly installed on the side of L-shaped support plate 2. A fixed sleeve 62 is fixedly installed at the bottom of fixed seat 61. A moving rod 63 is slidably installed inside fixed sleeve 62. Tension roller 64 is rotatably installed at the lower end of moving rod 63. The roller wall of tension roller 64, roller wall of pressure roller 53 and roller wall of support roller 4 are all concave arc surface. The number of support rollers 4 is the same as the number of pressure rollers 53, and the position of support roller 4 is the same as that of pressure roller 53. The positions of 3 are arranged in a one-to-one correspondence. A pressure sensor 65 is fixedly installed at the upper end of the moving rod 63. A spring 66 is fixed between the top of the pressure sensor 65 and the inner wall of the fixed sleeve 62. During the movement and turning of the chain, it will generate a continuous squeezing force on the tension roller 64. This force acts on the end of the moving rod 63 which is linked to the tension roller 64, pushing the moving rod 63 to contract into the fixed sleeve 62. The contraction of the moving rod 63 will directly squeeze the pressure sensor 65 and the spring 66 preset in the fixed sleeve 62, causing the spring 66 to undergo elastic deformation. During this process, the pressure sensor 65 connected to the moving rod 63 will capture the pressure signal in real time.

[0036] The protective sleeve 7 is fixedly installed on the side wall of the L-shaped support plate 2, and the protective sleeve 7 is located between the self-adjusting clamping mechanism 5 and the tension detection mechanism 6. The internal thread of the protective sleeve 7 is equipped with a laser measurement sensor 8. By rotating the laser measurement sensor 8, the laser measurement sensor 8 can be screwed out from the inside of the protective sleeve 7, which facilitates the disassembly and maintenance of the laser measurement sensor 8. During the traction measurement process, a slight vibration will be generated and transmitted to the laser measurement sensor 8, but since the diameter of the chain is much larger than the laser optical path range, it will not affect the detection results.

[0037] A cleaning mechanism 9 is located on the top of the base 1, and is situated on one side of the roller 4 and the self-adjusting pressing mechanism 5. The cleaning mechanism 9 includes a cleaning brush 91 fixedly mounted on one side of the roller 4 and one side of the pressure roller 53 (the cleaning brush 91 is fixed to the roller 4 and pressure roller 53 via a snap-fit ​​installation structure; after a period of use, the cleaning brush 91 wears down significantly, reducing its cleaning effect; in this case, the cleaning brush 91 can be disassembled and replaced). A support rod 92 is fixedly mounted on the top of the base 1, near the cleaning brush 91. An exhaust fan 93 is fixedly mounted on the upper end of the support rod 92. An exhaust fan 94 is fixedly mounted on the side of the exhaust fan 93 away from the cleaning brush 91, and multiple exhaust fans 94 are arranged around the side of the exhaust fan 93 near the cleaning brush 91. The exhaust duct 93 has evenly distributed first exhaust holes 95, and a filter screen 96 is fixedly installed inside. A sealing door plate is located at the bottom of the side wall of the exhaust duct 93. Opening the sealing door plate allows for the cleaning of impurities deposited at the bottom of the exhaust duct 93. When the exhaust fan 94 operates, it draws the air inside the exhaust duct 93 outwards, creating a stable negative pressure inside the exhaust duct 93. Under this negative pressure, the multiple first exhaust holes 95 on the side wall of the exhaust duct 93 generate directional suction, efficiently drawing the dust raised by the cleaning brush 91 into the exhaust duct 93. The filter screen 96 inside the exhaust duct 93 intercepts and filters the drawn-in dust. An auxiliary exhaust mechanism 97 extending between the support roller 4 and the pressure roller 53 is located on one side of the exhaust duct 93. The auxiliary exhaust mechanism 97 includes components fixedly installed on... An auxiliary exhaust pipe 971 is located on the side wall of the exhaust duct 93, with the end of the auxiliary exhaust pipe 971 away from the exhaust duct 93 being closed. Multiple evenly distributed second exhaust holes 972 are provided on the wall of the auxiliary exhaust pipe 971. The negative pressure inside the exhaust duct 93 is simultaneously transmitted to the connected auxiliary exhaust pipe 971, causing the multiple second exhaust holes 972 on the auxiliary exhaust pipe 971 to form secondary suction. A connecting shaft 98 is fixedly mounted on the side wall of one of the idler rollers 4. The end of the connecting shaft 98 away from the idler roller 4 extends into the interior of the exhaust duct 93 and is fixedly mounted with a first gear 99. A drive shaft 910 is fixedly rotatably mounted on the inner side wall of the exhaust duct 93. A second gear 911 is fixedly mounted on the shaft wall of the drive shaft 910. The first gear 99 and the second gear 911 mesh with each other. The drive shaft 910 has a cleaning scraper 912 fixed at one end, which is in contact with the surface of the filter screen 96. When the roller 4 rotates, it drives the connecting shaft 98 to rotate synchronously. The first gear 99 at the end of the connecting shaft 98 meshes with the second gear 911, causing the drive shaft 910 inside the second gear 911 to rotate. During the rotation of the drive shaft 910, the cleaning scraper 912 connected to its end operates synchronously. The cleaning scraper 912 continuously scrapes the dust layer attached to the surface of the filter screen 96, preventing the pores of the filter screen 96 from being blocked. The faster the roller 4 rotates, the greater the concentration of dust raised. At this time, the faster the cleaning scraper 912 rotates, the higher the scraping efficiency of the filter screen 96. Conversely, the slower the roller 4 rotates, the lower the scraping efficiency of the filter screen 96.

[0038] The PLC controller 10 is fixedly mounted on the side wall of the L-shaped support plate 2. The winding traction mechanism 3, the self-adjusting clamping mechanism 5, the tension detection mechanism 6, and the cleaning mechanism 9 are all electrically connected to the PLC controller 10.

[0039] The operating principle of this invention is described as follows: First, the operator places the chain with steel balls stably on the multiple rollers 4 of the device. The concave arc surface of the roller 4 is adapted to the shape of the chain, which can stably support the chain and prevent the chain from shifting laterally or rolling during subsequent traction. Then, the operator connects one end of the chain to the winding wheel 32. The pre-installed hanging parts (such as hooks with locking buckles) inside the winding wheel 32 can quickly fix the end of the chain. During operation, it is necessary to ensure that the hanging parts are in a vertically upward state to ensure that the distance from the end of the chain connected to the hanging parts to the laser measuring sensor 8 is controlled to 1 meter. At the same time, the chain is wrapped around the lower side of the roller wall of the tension roller 64. The tension roller 64 is used to keep the chain moderately tensioned to prevent the chain from being loose and affecting the measurement accuracy. At this time, the chain is aligned with the detection end of the laser measuring sensor 8 to ensure that the laser measuring sensor 8 can capture the movement signal of the chain. After completing the preliminary preparation, the main power supply of the device is turned on to supply power to each execution component.

[0040] Subsequently, the staff issued a command through the PLC controller 10 to start the electric push rod 51. The moving end of the electric push rod 51 extended smoothly, driving the L-shaped moving plate 52 to move downward in the vertical direction. The multiple pressure rollers 53 on the side of the L-shaped moving plate 52 moved downward accordingly until the outer wall of the pressure roller 53 was in close contact with the top of the chain. At this time, the concave arc surface of the support roller 4 lifted the chain from below, and the pressure roller 53 adhered and limited from above. The two formed a "cooperative clamping" structure, which can not only stably limit the chain, but also prevent the limiting part from bending downward in an arc due to uneven force. This ensures that the chain always maintains a straight moving posture during the traction process. The chain passes through the detection end of the laser measurement sensor 8, laying the foundation for the accuracy of length measurement.

[0041] After the limit is completed, the operator sets the motor 34 to a constant speed mode and starts it via the PLC controller 10. The motor 34 drives the rotating shaft 33 to rotate at a constant speed. The rotating shaft 33 drives the winding wheel 32 at the end to rotate synchronously. The winding wheel 32 generates a stable traction force on the chain through the hanging parts, so that the chain moves along the channel formed by the idler roller 4 and the pressure roller 53 at a preset speed. When the chain moves to the detection area of ​​the laser measurement sensor 8, the laser measurement sensor 8 captures the chain signal in real time and immediately feeds back an electrical signal to the PLC controller 10, triggering the internal timing module of the PLC controller 10 to start counting. Throughout the entire traction process, the timing module continuously records the total time from the "initial position" to the "complete separation from the sensor detection area". The PLC controller 10 automatically calculates the movement length of the chain in this stage according to the calculation formula "length = speed × time". Finally, the PLC controller 10 automatically adds the calculated length value to the initial calibration of 1 meter (i.e., the distance from the end of the chain connected to the hanger to the laser measurement sensor 8 at the beginning) according to the preset program to generate the final actual length of the chain, which can be displayed in real time on the display screen of the PLC controller 10 to complete the entire length measurement operation.

[0042] During the chain traction measurement process, the tension roller 64 maintains close contact with the chain. When the chain moves along the preset path under the traction of the winding wheel 32, the tension roller 64 will rotate due to friction. The tension roller 64 not only plays the core role of changing the traction direction of the chain, but also ensures that the chain is evenly wound on the wheel wall of the winding wheel 32. At the same time, the chain will generate a continuous squeezing force on the tension roller 64 during movement and turning. This external force acts on the end of the moving rod 63 linked with the tension roller 64, pushing the moving rod 63 to contract into the fixed sleeve 62. The contraction of the moving rod 63 will directly squeeze the preset pressure sensor 65 and spring 66 inside the fixed sleeve 62, causing the spring 66 to undergo elastic deformation. During this process, the pressure sensor 65 connected to the moving rod 63 will capture the pressure signal in real time and convert it into an electrical signal to be continuously transmitted to the PLC controller 10, forming a dynamic monitoring closed loop for the chain traction force.

[0043] When the pressure signal received by the PLC controller 10 reaches the internally preset threshold, it means that the clamping and squeezing force of the idler roller 4 and pressure roller 53 on the chain is too large, causing the traction force on the chain to exceed the safe range. If this state continues, it may cause deformation of the steel balls on the chain surface, wear of the chain links, or even breakage. To avoid this phenomenon, the PLC controller 10 will immediately trigger the protection mechanism and send a retraction command to the electric push rod 51 to control the moving end of the electric push rod 51 to retract, driving the L-shaped moving plate 52 to move vertically. At the same time, the multiple pressure rollers 53 on the side of the L-shaped moving plate 52 move upward, and the contact pressure with the top of the chain is significantly reduced. Through this dynamic adjustment, the clamping and squeezing force of the idler roller 4 and pressure roller 53 on the chain is effectively relieved, and the traction force on the chain is reduced synchronously, eventually returning to the safe range, realizing real-time protection of the chain and ensuring the stable operation of traction measurement.

[0044] During chain traction measurement, as the chain smoothly travels between the idler roller 4 and the pressure roller 53, the pre-installed cleaning brushes 91 on the single-sided idler roller 4 and pressure roller 53 rotate synchronously. Their fine bristles adhere closely to the chain surface, thoroughly cleaning dust, debris, and other impurities. Through continuous mechanical friction and cleaning action, contaminants on the chain surface are effectively removed, preventing impurities from obstructing or interfering with the detection optical path of the subsequent laser measurement sensor 8. This lays a clean foundation for the laser measurement sensor 8 to accurately identify the chain position and collect length data. Simultaneously, workers... The PLC controller 10 starts the exhaust fan 94. After the exhaust fan 94 starts running, it quickly draws the gas inside the exhaust duct 93 outward, creating a stable negative pressure inside the exhaust duct 93. Under the action of negative pressure, the multiple first exhaust holes 95 on the side wall of the exhaust duct 93 generate directional suction, which efficiently draws the dust raised by the cleaning brush 91 into the exhaust duct 93. The filter screen 96 built into the exhaust duct 93 can intercept and filter the dust-laden gas. The dust particles are blocked on the filter screen 96, and the purified clean gas is smoothly discharged through the exhaust fan 94, preventing the dust from spreading to the surrounding environment.

[0045] While the dust around the cleaning brush 91 is being sucked up, the negative pressure inside the exhaust duct 93 is also simultaneously transmitted to the connected auxiliary exhaust pipe 971, so that the multiple second exhaust holes 972 on the auxiliary exhaust pipe 971 form a secondary suction force. On the one hand, it can promptly suck up the trace dust that may be generated during the squeezing and friction of the chain body through the roller 4 and the pressure roller 53, preventing the fine dust from accumulating around the roller body. On the other hand, it can actively suck up the air around the laser measurement sensor 8, sucking away the light impurities such as dust and cotton wool that may float near the lens of the laser measurement sensor 8, further reducing the interference of environmental factors on the laser signal reception, and indirectly improving the detection accuracy and data stability of the laser measurement sensor 8.

[0046] During the entire dust extraction process, when the idler roller 4 rotates, it drives the connecting shaft 98 to rotate synchronously. The first gear 99 at the end of the connecting shaft 98 meshes with the second gear 911, causing the transmission shaft 910 inside the second gear 911 to rotate. During the rotation of the transmission shaft 910, the cleaning scraper 912 connected to its end operates synchronously. The cleaning scraper 912 continuously scrapes the dust layer attached to the surface of the filter screen 96. By removing the dust accumulated on the filter screen 96 in real time, the pores of the filter screen 96 are prevented from being blocked, and the ventilation efficiency and dust filtration effect of the exhaust system are always maintained.

[0047] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A length measuring device for a high-density elevator balance compensation chain with steel balls, comprising a base (1), wherein an L-shaped support plate (2) is fixedly provided on the top of the base (1), characterized in that, Also includes: A winding traction mechanism (3) is provided on the top side of the base (1), and the winding traction mechanism (3) is used to wind and pull the chain. Multiple rollers (4) are arranged in a straight line and rotate on the bottom of the side wall of the L-shaped support plate (2). The top of the L-shaped support plate (2) is provided with a self-adjusting pressing mechanism (5) that cooperates with the multiple rollers (4). Tension detection mechanism (6) is set on the side wall of the L-shaped support plate (2), and tension detection mechanism (6) is located between the self-adjusting clamping mechanism (5) and the winding traction mechanism (3). Tension detection mechanism (6) and self-adjusting clamping mechanism (5) are linked and cooperated. The protective sleeve (7) is fixedly installed on the side wall of the L-shaped support plate (2), and the protective sleeve (7) is located between the self-adjusting pressing mechanism (5) and the tension detection mechanism (6). The internal thread of the protective sleeve (7) is provided with a laser measurement sensor (8). The cleaning mechanism (9) is located on the top of the base (1) and is situated on one side of the roller (4) and the self-adjusting pressing mechanism (5). The PLC controller (10) is fixedly installed on the side wall of the L-shaped support plate (2). The winding traction mechanism (3), the self-adjusting pressing mechanism (5), the tension detection mechanism (6) and the cleaning mechanism (9) are all electrically connected to the PLC controller (10).

2. The length measuring device for a high-density elevator balance compensation chain with steel balls according to claim 1, characterized in that, The winding traction mechanism (3) includes two fixed plates (31) symmetrically fixed on the top of the base (1). A winding wheel (32) is provided between the two fixed plates (31), and the two sides of the winding wheel (32) are rotatably connected to the two fixed plates (31) through a rotating shaft (33). A motor (34) is fixedly provided on the side of one of the fixed plates (31), and the output end of the motor (34) is fixedly connected to one end of one of the rotating shafts (33).

3. The length measuring device for a high-density elevator balance compensation chain with steel balls according to claim 1, characterized in that, The self-adjusting pressing mechanism (5) includes an electric push rod (51) fixedly installed on the top of the L-shaped support plate (2). The moving end of the electric push rod (51) is fixedly provided with an L-shaped moving plate (52). The side of the L-shaped moving plate (52) is provided with a plurality of pressure rollers (53) arranged in a straight line.

4. The length measuring device for a high-density elevator balance compensation chain with steel balls according to claim 3, characterized in that, The tension detection mechanism (6) includes a fixed seat (61) fixedly mounted on the side of the L-shaped support plate (2). A fixed sleeve (62) is fixedly mounted at the bottom of the fixed seat (61). A moving rod (63) is slidably mounted inside the fixed sleeve (62). A tension roller (64) is rotatably mounted at the lower end of the moving rod (63). A pressure sensor (65) is fixedly mounted at the upper end of the moving rod (63). A spring (66) is fixedly mounted between the top of the pressure sensor (65) and the inner wall of the fixed sleeve (62).

5. The length measuring device for a high-density elevator balance compensation chain with steel balls according to claim 4, characterized in that, The roller wall of the tension roller (64), the roller wall of the pressure roller (53) and the roller wall of the idler roller (4) are all concave arc surfaces. The number of idler rollers (4) is the same as the number of pressure rollers (53), and the positions of the idler rollers (4) and the positions of the pressure rollers (53) are arranged in a one-to-one correspondence.

6. The length measuring device for a high-density elevator balance compensation chain with steel balls according to claim 3, characterized in that, The cleaning mechanism (9) includes a cleaning brush (91) fixedly mounted on one side of the idler roller (4) and one side of the pressure roller (53). A support rod (92) is fixedly mounted on the top of the base (1) and on the side near the cleaning brush (91). An exhaust duct (93) is fixedly mounted on the upper end of the support rod (92). An exhaust fan (94) is fixedly mounted on the side of the exhaust duct (93) away from the cleaning brush (91). A plurality of evenly distributed first exhaust holes (95) are opened around the side of the exhaust duct (93) near the cleaning brush (91). A filter screen (96) is fixedly mounted inside the exhaust duct (93). An auxiliary exhaust mechanism (97) extending between the idler roller (4) and the pressure roller (53) is provided on one side of the exhaust duct (93).

7. The length measuring device for a high-density elevator balance compensation chain with steel balls according to claim 6, characterized in that, The auxiliary exhaust mechanism (97) includes an auxiliary exhaust pipe (971) fixedly installed on the side wall of the exhaust duct (93), and the end of the auxiliary exhaust pipe (971) away from the exhaust duct (93) adopts a closed structure. The pipe wall of the auxiliary exhaust pipe (971) is provided with a plurality of evenly distributed second exhaust holes (972).

8. The length measuring device for a high-density elevator balance compensation chain with steel balls according to claim 7, characterized in that, A connecting shaft (98) is fixedly provided on the side wall of one of the rollers (4). The end of the connecting shaft (98) away from the roller (4) extends into the interior of the exhaust duct (93) and is fixedly provided with a first gear (99). A transmission shaft (910) is fixedly rotatably provided on the inner side wall of the exhaust duct (93). A second gear (911) is fixedly provided on the shaft wall of the transmission shaft (910). The first gear (99) and the second gear (911) are meshed. A cleaning scraper (912) is fixedly provided at one end of the transmission shaft (910) and is in contact with the surface of the filter screen (96).

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