A screw tensioning device for hoist

Abstract

The present invention discloses a screw tensioning device for an elevator, and relates to the technical field of bucket elevators. The screw tensioning device for an elevator comprises a housing and a lifting assembly, wherein the lifting assembly comprises a rotating shaft, a sprocket and a chain, and further comprises: a tension detection mechanism, wherein the tension detection mechanism comprises a contact plate and a detection assembly, wherein one end of the contact plate in a radial direction extends from a smooth area and bears the pressure of the chain, and the contact plate bearing the pressure can produce displacement in the radial direction of the sprocket. By setting the contact plate and the detection assembly, as the chain slack increases, the contact plate will gradually move to a side away from the axis of the sprocket, thereby reducing the pressure applied to the detection assembly, and as the chain slack decreases, the contact plate will gradually move to a side close to the axis of the sprocket, thereby increasing the pressure applied to the detection assembly, so as to realize real-time detection of the chain tension, and realize real-time automatic adjustment of the chain tension through a control unit and an adjustment mechanism.

Description

Technical Field

[0001] The invention relates to the technical field of bucket elevators, in particular to a screw tensioning device for bucket elevators. Background Art

[0002] Bucket elevators using chains drive the bucket to lift materials through the chain. In order to ensure the normal operation of the chain during operation, a tensioning device is required to maintain the tension of the chain to prevent the chain from slackening and causing chain jumping or jamming. Tensioning devices are usually divided into weight tensioning, screw tensioning and spring tensioning. Among them, screw tensioning adjusts the height of the lower shaft of the elevator by adjusting the nut on the screw, so that the chain maintains appropriate tension.

[0003] In the prior art, it is usually necessary to manually judge the tension of the chain and then adjust it by manually turning the nut. For example, a screw tensioning device for a hoist is proposed in the patent with announcement number CN212244975U. The device achieves tensioning by setting an adjusting screw, a locking nut and a spring. It has a reasonable structure and is easy to adjust.

[0004] However, in the existing technology, there is no device that can perform automatic tension adjustment in real time and accurately. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a screw tensioning device for a hoist, which solves the problems raised in the background technology.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: a screw tensioning device for a hoist, comprising a housing and a lifting assembly, the lifting assembly being installed in the housing, the lifting assembly comprising a rotating shaft, a sprocket and a chain, the sprocket being fixedly arranged on the outer peripheral surface of the rotating shaft, the middle portion of the outer peripheral surface of the sprocket being a gear tooth area, and both sides of the middle portion being smooth areas, the chain being meshed in the gear tooth area, and also comprising: a tension detection mechanism, the tension detection mechanism comprising a contact plate and a detection assembly, a plurality of the contact plates being radially arranged on the surface of the sprocket, one end of the contact plate extending from the smooth area in a radial direction and bearing the pressure of the chain, the contact plate bearing the pressure being able to produce displacement in the radial direction of the sprocket, the detection assembly being arranged on one side of the sprocket, different displacements of the contact plate being able to produce different pressures on the detection assembly, and the detection assembly converting the pressure into an electrical signal; an adjustment mechanism, the adjustment mechanism being arranged on one side of the sprocket, and being used to adjust the height of the rotating shaft to maintain the tension balance of the chain; a control unit, the electrical signal detected by the detection assembly being transmitted to the control unit, and the control unit controlling the action of the adjustment mechanism according to the received electrical signal.

[0007] Furthermore, a limiting slide groove is radially provided on the outer surface of the sprocket, and one end of the limiting slide groove extends to the smooth area, the limiting slide groove corresponds to the contact plate one-to-one, the contact plate can slide in the limiting slide groove, and when the chain tension is balanced, the end of the contact plate away from the sprocket axis is at least flush with the smooth area of ​​the sprocket; a limiting block is fixedly provided on the side of the contact plate away from the sprocket, and both sides of the contact plate are provided with a first concave block fixed to the end face of the sprocket, the two ends of the limiting block are located in the recessed part of the first concave block, and slide in the recessed part, so as to limit the contact plate from disengaging from the limiting slide groove.

[0008] Furthermore, the contact plates are divided into two groups and are arranged on both sides of the sprocket respectively, and the contact plates on both sides are arranged alternately to obtain more detection points; each group of contact plates is equipped with a set of detection components.

[0009] Furthermore, a single group of the detection component includes: a sliding ring, which is slidably arranged on the outer circumferential surface of the rotating shaft, and a connecting rod is hinged between the sliding ring and the contact plate on the same side, so that the sliding ring is driven to move axially along the rotating shaft when the contact plate slides; a fixed ring, which is fixedly arranged on the outer circumferential surface of the rotating shaft and is located on the other side of the sliding ring, and a first spring is arranged between the fixed ring and the sliding ring, and the first spring applies pressure to the sliding ring so that the sliding ring always generates thrust on the contact plate; a sensor, a receiving groove is opened on the side of the sliding ring close to the fixed ring, and the sensor is arranged in the receiving groove, and the sensor is used to sense the pressure of the spring, and a gasket is arranged between the first spring and the sensor, and the gasket is located in the receiving groove.

[0010] Furthermore, the sensor is a resistive film pressure sensor or an annular pressure sensor.

[0011] Furthermore, the detection component includes: a second spring, the second spring is arranged between the limit block and the side of the recessed portion close to the rotating shaft, the second spring applies pressure to the contact plate toward the outer peripheral surface of the sprocket; a roller, the roller is rotatably arranged at one end of the contact plate close to the center of the sprocket; a contact head, a fixed plate is fixedly provided on one side of the outer shell close to the sprocket, the contact head is elastically mounted on the fixed plate, and the contact head does not rotate relative to the sprocket, and the roller squeezes the contact head when the sprocket rotates, so that the contact head is displaced along the radial direction of the sprocket; a slide, the slide is fixedly provided at one end of the contact head, a resistance coil is also fixedly provided on the fixed plate, the slide is in contact with the resistance coil, and the slide moves together with the connecting block to change the contact position between the slide and the resistance coil.

[0012] Furthermore, the contact plate is arranged on one side of the sprocket close to the inner wall of the shell, and multiple contact plates are distributed equidistantly; there are three contact heads, which are respectively close to the loose side, tight side and bottom end of the chain at the sprocket, and the three contact heads are located on the same arc.

[0013] Furthermore, one end of the contact plate in contact with the chain is configured to be an arc, one side of the arc is a meeting side in contact with the chain, and the arc is inclined toward the meeting side.

[0014] Furthermore, the adjustment mechanism includes an actuator and a drive assembly, the actuator is connected to the rotating shaft, and the drive assembly is used to control the movement of the actuator to change the height of the rotating shaft; the actuator includes: a movable plate, the movable plate is arranged outside the shell near the rotating shaft, the shell is provided with an avoidance groove at the rotating shaft, the end of the rotating shaft passes through the avoidance groove and is fixedly connected to the movable plate; an adjusting screw, the adjusting screw is vertically arranged on the upper side of the movable plate, the outer wall of the shell is fixedly provided with a fixing frame, the upper end of the adjusting screw is rotatably connected to the fixing frame, The lower end of the adjusting screw is threadedly connected to the movable plate; the driving assembly includes: a turbine, which is fixedly arranged on the outer peripheral surface of the upper side of the adjusting screw and is coaxial with the adjusting screw; a transmission rod, a mounting frame is fixedly arranged on the outer shell, and the mounting frame passes through the two side walls of the outer shell, the transmission rod is rotatably installed in the mounting frame, and worms are coaxially fixedly arranged at both ends of the transmission rod, and the worms are meshed with the turbine; a motor, the motor is fixedly arranged in the mounting frame, a first gear is fixedly arranged at the output end of the motor, and a second gear meshing with the first gear is coaxially fixedly arranged on the transmission rod.

[0015] Furthermore, the motor is electrically connected to a control unit, and the control unit controls the motor to start or shut down according to an electrical signal generated by the detection component.

[0016] The present invention has the following beneficial effects:

[0017] (1) The screw tensioning device for the hoist is provided with a contact plate and a detection assembly. As the chain slack increases, the contact plate will gradually move to a side away from the sprocket axis, thereby reducing the pressure applied to the detection assembly. As the chain slack decreases, the contact plate will gradually move to a side close to the sprocket axis, thereby increasing the pressure applied to the detection assembly, so as to achieve real-time detection of the chain tension, and achieve real-time automatic adjustment of the chain tension through the control unit and the adjustment mechanism.

[0018] (2) The screw tensioning device for the hoist divides the contact plates into two groups and arranges them on both sides of the sprocket respectively, and the contact plates on both sides are arranged in a staggered manner to obtain more detection points, thereby avoiding the chain jumping causing the tension detection mechanism to obtain erroneous tensioning data, thereby improving the reliability and accuracy of the tensioning data, and then reducing the detection error by averaging, and using the minimum value to avoid excessive tension of one chain when adjusting the other chain.

[0019] (3) The screw tensioning device for the hoist is provided with a mounting frame in the housing and a transmission rod in the mounting frame. The transmission rod drives the adjustment screws on both sides to rotate simultaneously, thereby adjusting the two ends of the rotating shaft synchronously to prevent the rotating shaft from tilting during the height adjustment process.

[0020] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 This is a schematic diagram of the internal structure of a housing according to an embodiment of the present invention;

[0023] Figure 3 It is a right side view of a sprocket and a tension detection mechanism according to a first embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of the cooperation between the sprocket and the tension detection mechanism in accordance with the first embodiment of the present invention;

[0025] Figure 5 This is a schematic diagram of the contact plate distribution in accordance with the first embodiment of the present invention;

[0026] Figure 6 This is a schematic diagram of the sprocket structure of Embodiment 1 of the present invention;

[0027] Figure 7 This is an exploded view of the internal structure of a sliding ring according to a first embodiment of the present invention;

[0028] Figure 8 It is a front view of the housing of the present invention;

[0029] Fig. 9 This is a schematic diagram of the structure of the drive assembly of the present invention;

[0030] Fig.10 This is a schematic diagram of the cooperation between the sprocket and the tension detection mechanism in the second embodiment of the present invention;

[0031] Fig.11 It is a front view of the sprocket and the tension detection mechanism of the second embodiment of the present invention;

[0032] Fig.12 This is a schematic diagram of a tension detection mechanism according to a second embodiment of the present invention;

[0033] Fig.13 This is a schematic diagram of the back structure of the fixing plate according to the second embodiment of the present invention;

[0034] Fig.14 This is a schematic diagram of the structure of the detection component of Example 2 of the present invention.

[0035] In the figure, 1, housing; 2, chain; 3, hopper; 4, movable plate; 5, clamping plate; 6, limit strip; 7, fixed frame; 8, mounting frame; 9, rotating shaft; 10, sprocket; 11, limit slide groove; 12, contact plate; 13, sliding ring; 131, receiving groove; 132, gasket; 14, connecting rod; 15, first spring; 16, fixed ring; 17, partition plate; 18, electric slip ring joint; 19, limit block; 20, first concave block; 21, Sensor; 22, motor; 23, first gear; 24, second gear; 25, transmission rod; 26, turbine; 27, worm; 28, adjusting screw; 29, first guide rod; 30, second spring; 31, roller; 32, fixing plate; 321, notch groove; 33, contact head; 34, connecting block; 35, second concave block; 36, second guide rod; 37, third spring; 38, sliding plate; 39, resistance coil; 40, avoidance groove. DETAILED DESCRIPTION

[0036] 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.

[0037] In the description of the present invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inside", "all around" and the like indicating orientation or positional relationship are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0038] According to the following Figure 1 - Fig.14 A screw tensioning device for a hoist provided by an embodiment of the present invention is described.

[0039] Embodiment 1:

[0040] See also Figure 1 - Figure 4The embodiment of the present invention provides a screw tensioning device for a hoist, including a shell 1 and a lifting component. The lifting component is installed in the shell 1 and is used to transport materials from the bottom end to the top end of the hoist. The lifting component includes a rotating shaft 9, a sprocket 10 and a chain 2. The sprocket 10 is fixedly installed on the outer circumference of the rotating shaft 9. In fact, the lifting component also includes a hopper 3, which is used to load materials. Usually, the sprocket 10 and the chain 2 are provided with two groups, which are respectively located on both sides of the rotating shaft 9, and the hopper 3 is fixedly installed on the two chains 2 by bolts. In this device, the middle part of the outer circumference of the sprocket 10 is a gear tooth area, and the two sides of the middle part are smooth areas. When the chain 2 is meshed with the sprocket 10, the teeth of the sprocket 10 pass through the hollow part of the chain 2, and correspondingly, the two sides of the chain 2 will press the smooth area of ​​the sprocket 10.

[0041] It also includes a tension detection mechanism, which includes a contact plate 12 and a detection component. Multiple contact plates 12 are radially arranged on the surface of the sprocket 10, preferably corresponding to the tooth area. The specific meaning of corresponding here is that one end of each contact plate 12 points to the tooth of the sprocket 10, so that the contact plate 12 can withstand the pressure of the chain 2 when one end along the radial direction extends from the smooth area. The contact plate 12 that withstands the pressure can be displaced in the radial direction of the sprocket 10. When the pressure increases, the contact plate 12 moves toward the axis of the rotating shaft 9. When the pressure decreases, the contact plate 12 moves toward the outer peripheral surface of the sprocket 10. The detection component is arranged on one side of the sprocket 10. When the contact plate 12 is displaced, different pressures can be generated on the detection component, and the detection component converts the pressure into an electrical signal. Different pressures will generate different electrical signals, thereby detecting the tension data of the chain 2 through the tension detection mechanism.

[0042] In addition, in order to adjust the height of the rotating shaft 9, an adjusting mechanism is provided on one side of the sprocket 10. When the chain 2 becomes loose during use, the height of the rotating shaft 9 can be lowered through the adjusting mechanism to tighten the chain 2, thereby maintaining the tension balance of the chain 2. The tension balance means that the chain 2 will not jump or get stuck due to looseness, nor will the rotating shaft 9 and the chain 2 be worn more severely due to excessive tension.

[0043] Furthermore, in order to realize automatic tensioning of the chain 2, a control unit is provided to transmit the electrical signal detected by the detection component to the control unit, and the control unit controls the action of the adjustment mechanism according to the size of the received electrical signal, thereby automatically tensioning the chain 2.

[0044] In this embodiment, as the slackness of the chain 2 increases, the contact plate 12 will gradually move to the side away from the axis of the sprocket 10, thereby reducing the pressure applied to the detection component. As the slackness of the chain 2 decreases, the contact plate 12 will gradually move to the side close to the axis of the sprocket 10, thereby increasing the pressure applied to the detection component, so as to achieve real-time detection of the tension of the chain 2 and realize real-time automatic adjustment of the tension of the chain through the control unit and the adjustment mechanism.

[0045] Combination Figure 4 - Figure 6 In order to facilitate the installation of the contact plate 12, a limiting slide groove 11 is radially provided on the outer surface of the sprocket 10, and one end of the limiting slide groove 11 extends to the smooth area, forming an opening in the smooth area. The limiting slide groove 11 corresponds to the contact plate 12 one by one, so that each contact plate 12 can slide in the radial direction of the rotating shaft 9 in the corresponding limiting slide groove 11. Preferably, the cross-section of the limiting slide groove 11 and the contact plate 12 is a trapezoidal structure to prevent the contact plate 12 from detaching from the limiting slide groove 11. When the tension of the chain 2 is balanced, the end of the contact plate 12 away from the axis of the sprocket 10 is at least flush with the smooth area of ​​the sprocket 10, and the contact plate 12 can also extend out of the smooth area to ensure that the contact plate 12 is always in contact with the chain 2.

[0046] In addition, a limit block 19 is fixedly provided on the side of the contact plate 12 away from the sprocket 10, and first concave blocks 20 fixed to the end faces of the sprocket 10 are provided on both sides of the contact plate 12. The recessed portion of the first concave block 20 faces the contact plate 12, so that the two ends of the limit block 19 are located in the recessed portion of the first concave block 20 and slide in the recessed portion, thereby limiting the sliding distance of the contact plate 12 on the sprocket 10 and preventing the contact plate 12 from escaping from the limit slide groove 11.

[0047] Combination Figure 4 and Figure 5 In order to improve the reliability of the tensioning data and prevent the tension detection mechanism from obtaining erroneous tensioning data due to the jumping of the chain 2, it is preferred to divide the contact plates 12 on a sprocket 10 into two groups and arrange them on both sides of the sprocket 10 respectively, and the contact plates 12 on both sides are staggered to obtain more detection points. Each group of contact plates 12 is equipped with a group of detection components, so that two tensioning data are obtained on one sprocket 10, and the obtained tensioning data are transmitted to the control unit. The control unit calculates the average value of the two tensioning data, recorded as a, and then obtains the average value of two tensioning data from another sprocket 10, recorded as b, compares a and b, and takes the smaller data as the execution data for adjusting the tension degree.

[0048] Specifically, when the sprocket 10 has 10 teeth (such as Figure 4 and Figure 5As shown in the figure, five contact plates 12 are arranged on one side of the sprocket 10, and the five contact plates 12 are arranged at equal intervals and correspond to the positions of the gear teeth. Five contact plates 12 are also arranged on the other side of the sprocket 10, and the positions of these five contact plates 12 correspond to the positions of the remaining gear teeth. The number of gear teeth and contact plates 12 is only for example, and other numbers may also be used.

[0049] In this embodiment, the purpose of finding the average value is to reduce the detection error, and the smaller average value is taken as the execution data in order to select the one with less slack from the two chains 2 as the adjustment object, so as to avoid excessive tension of the other chain 2 when adjusting one of the chains 2.

[0050] Combination Figure 2 , Figure 3 , Figure 4 and Figure 7 The detection component is described in detail below. A single detection component includes a sliding ring 13, which is slidably arranged on the outer peripheral surface of the rotating shaft 9. A connecting rod 14 is hinged between the sliding ring 13 and the contact plate 12 on the same side. Multiple connecting rods 14 on the same side are hinged on one sliding ring 13, so that when the contact plate 12 slides radially along the sprocket 10, it drives the sliding ring 13 to move axially along the rotating shaft 9.

[0051] In addition, a fixed ring 16 is fixedly provided on the outer circumferential surface of the rotating shaft 9, and the fixed ring 16 is located on the other side of the sliding ring 13. The fixed ring 16 is used to limit the sliding range of the sliding ring 13. A first spring 15 is provided between the fixed ring 16 and the sliding ring 13. The first spring 15 applies pressure to the sliding ring 13, so that the sliding ring 13 always generates thrust on the contact plate 12, so that the contact plate 12 is always in contact with the chain 2. Optionally, a partition plate 17 can be provided between the two sprockets 10 instead of the two fixed rings 16, so as to separate the two first springs 15 located between the two sprockets 10.

[0052] In addition, a receiving groove 131 is provided on one side of the slip ring 13 close to the fixed ring 16, and a sensor 21 is provided in the receiving groove 131. The sensor 21 is used to sense the pressure of the spring, and the sensor 21 transmits the acquired pressure data to the control unit as tensioning data. A gasket 132 is also provided between the first spring 15 and the sensor 21, and the gasket 132 is located in the receiving groove 131. The gasket 132 is used to increase the contact area between the first spring 15 and the sensor 21, so that the surface of the sensor 21 is evenly stressed. In order to electrically connect the sensor 21 in a rotating state with the control unit, an electric slip ring joint 18 can be provided on the rotating shaft 9, so that the sensor 21 is electrically connected to the control unit through the electric slip ring joint 18. The sensor 21 can be a resistive film pressure sensor or an annular pressure sensor.

[0053] In the present embodiment, since multiple contact plates 12 are connected to the same sliding ring 13, the sliding distance of the sliding ring 13 is determined by the contact plate 12 closest to the axis of the sprocket 10, that is, it is determined by the contact plate 12 that is subjected to the greatest pressure, thereby avoiding the influence of the contact plate 12 where the teeth of the sprocket 10 are not engaged with the chain 2 on the sliding ring 13, and the influence of the jumping of the chain 2 on the sliding ring 13.

[0054] Combination Fig.10 or Fig.12 In order to reduce the impact when the contact plate 12 contacts the chain 2, one end of the contact plate 12 that contacts the chain 2 is set to an arc, one side of the arc is the facing side that contacts the chain 2, and the arc is inclined toward the facing side, and the inclination angle is preferably 10° to 30°, so that when the contact plate 12 contacts the chain 2, the chain 2 first contacts the lower side of the arc, and gradually applies pressure to the contact plate 12 through the arc, thereby avoiding direct contact between the side of the contact plate 12 and the chain 2.

[0055] Combination Figure 1 , Figure 8 and Fig. 9 The adjusting mechanism is described in detail below. The adjusting mechanism includes an actuator component and a driving component. The actuator component is connected to the rotating shaft 9. The driving component is used to control the movement of the actuator component to change the height of the rotating shaft 9, thereby adjusting the tension of the chain 2.

[0056] Specifically, the execution component includes a movable plate 4, which is arranged on the outside of the shell 1 near the rotating shaft 9. In order to facilitate the adjustment of the rotating shaft 9 in the vertical direction, an avoidance groove 40 is opened on the shell 1 at the rotating shaft 9. The end of the rotating shaft 9 passes through the avoidance groove 40 and is fixedly connected to the movable plate 4. Optionally, splints 5 fixed to the outer wall of the shell 1 can be arranged on both sides of the movable plate 4, and the gap between the splints 5 and the shell 1 forms a guide groove. The two sides of the movable plate 4 are placed in the guide groove, so that the movable plate 4 slides under the constraint of the guide groove. A limit strip 6 can be set at the lower end of the guide groove, and the limit strip 6 is used to limit the maximum downward movement distance of the movable plate 4.

[0057] In addition, an adjusting screw 28 is provided on the upper side of the movable plate 4, and the thread on the adjusting screw 28 can be opened only in the lower half. A fixing frame 7 is fixedly provided on the outer wall of the shell 1, so that the upper end of the adjusting screw 28 is rotatably connected to the fixing frame 7, and the adjusting screw 28 is axially fixed at the rotating connection, so that the adjusting screw 28 has a vertical load-bearing capacity, and the lower end of the adjusting screw 28 is threadedly connected to the movable plate 4, so that the movable plate 4 can be driven to move in the vertical direction by rotating the adjusting screw 28, and then the height of the rotating shaft 9 can be adjusted.

[0058] In addition, the driving assembly includes a turbine 26, which is fixed on the outer peripheral surface on the upper side of the adjusting screw 28 and is coaxial with the adjusting screw 28. A mounting frame 8 is fixed on the outer shell 1, and the mounting frame 8 passes through the two side walls of the outer shell 1. The penetration direction of the mounting frame 8 is parallel to the axis of the rotating shaft 9, and the mounting frame 8 is located between the chains 2. A transmission rod 25 is rotatably provided in the mounting frame 8. Worms 27 are coaxially fixed at both ends of the transmission rod 25, and the worm 27 is meshed with the turbine 26, so that the turbines 26 on both sides can be driven to rotate at the same time by the transmission rod 25, and then the heights of the movable plates 4 on both sides can be adjusted at the same time.

[0059] Furthermore, a motor 22 is fixedly provided in the mounting frame 8, a first gear 23 is fixedly provided at the output end of the motor 22, a second gear 24 meshing with the first gear 23 is coaxially fixedly provided on the transmission rod 25, and preferably, the first gear 23 and the second gear 24 constitute a reduction gear set to increase the torque of the transmission rod 25. Through the motor 22, the movable plate 4 can be driven to move in the vertical direction, thereby performing synchronous adjustments at both ends of the rotating shaft 9 to change the height of the rotating shaft 9, thereby realizing the adjustment of the tension of the chain 2.

[0060] In order to realize the control of the motor 22 through the control unit, the motor 22 is electrically connected to the control unit, and an optimal tensioning data is preset in the control unit as a reference data. This reference data can be determined by manually judging the tensioning degree of the chain 2 and entered into the control unit. When the height of the rotating shaft 9 is adjusted by the motor 22, the execution data is compared with the reference data in real time. When the execution data is less than the reference data, it means that the chain 2 is in a relaxed state. At this time, the motor 22 drives the movable plate 4 to descend to lower the height of the rotating shaft 9, and continuously tensions the chain 2 until the difference between the execution data and the reference data is adjusted to an allowable range, that is, the tension adjustment of the chain 2 is completed.

[0061] When in use (when working), the optimal tensioning data of the chain 2 is determined by manually judging the tensioning degree of the chain 2 as reference data and entered into the control unit. When the elevator is running, the contact plate 12 is always in contact with the chain 2 meshing on the gear teeth and is subjected to the pressure of the chain 2. The connecting rod 14 converts the radial movement of the contact plate 12 into the axial movement of the sliding ring 13, thereby changing the compression amount of the first spring 15. The sensor 21 senses the pressure of the first spring 15 and sends the data to the control unit, which processes and obtains the execution data.

[0062] The control unit compares the execution data with the reference data. When the execution data is less than the reference data, the control motor 22 is controlled to rotate, and the transmission rod 25 is driven to rotate through the reduction gear set. The transmission rod 25 drives the worm 27 at both ends to rotate. The worm 27 drives the adjusting screw 28 to rotate through the turbine 26, thereby adjusting the height of the movable plates 4 on both sides at the same time to lower the height of the rotating shaft 9, and continuously adjusting the tension of the chain 2 until the difference between the execution data and the reference data is adjusted to within the allowable range, that is, the tension adjustment of the chain 2 is completed.

[0063] Embodiment 2:

[0064] Combination Fig.10 - Fig.14 As shown, the detection component proposed in this embodiment is different from that in the first embodiment. The detection component includes a second spring 30. The second spring 30 is arranged between the limit block 19 and the side of the recessed portion close to the rotating shaft 9. The second spring 30 applies pressure to the contact plate 12 toward the outer peripheral surface of the sprocket 10. Optionally, a first guide rod 29 is fixed in the recessed portion, and the second spring 30 is sleeved on the outer peripheral surface of the first guide rod 29, and the two ends of the limit block 19 are slidably connected to the first guide rod 29, thereby improving the stability of the movement of the contact plate 12 and the limit block 19.

[0065] Furthermore, it also includes a roller 31 , which is rotatably disposed at one end of the contact plate 12 close to the center of the sprocket. The roller 31 can be made of a ball bearing.

[0066] In addition, it also includes a contact head 33. A fixing plate 32 is fixedly provided on the housing 1 near the sprocket 10. The contact head 33 is elastically installed on the fixing plate 32. The contact head 33 can elastically move along the radial direction of the sprocket 10, and the contact head 33 does not rotate relative to the sprocket 10. The roller 31 contacts the contact head 33 when the sprocket 10 rotates, and squeezes the contact head 33, so that the contact head 33 is displaced along the radial direction of the sprocket 10.

[0067] A specific elastic installation method of the contact head 33 is that a connecting block 34 is fixedly provided at one end of the contact head 33 close to the rotating shaft 9, and a second concave block 35 is fixedly provided on both sides of the connecting block 34, and a second guide rod 36 is fixedly provided in the second concave block 35, so that the two ends of the connecting block 34 are slidably connected to the second guide rod 36, and a third spring 37 is provided between the connecting block 34 and one end of the inner recess close to the rotating shaft 9, and the third spring 37 can reset the contact head 33. Of course, the elastic installation here can also use other suitable methods.

[0068] In addition, it also includes a slide 38, which is fixed at one end of the contact head 33. The slide 38 is a conductive material. A resistance coil 39 is also fixed on the fixed plate 32. The slide 38 is in contact with the resistance coil 39. The slide 38 moves together with the connecting block 34 to change the contact position between the slide 38 and the resistance coil 39. In order to facilitate the installation of the resistance coil 39 and the contact head 33, the resistance coil 39 and the contact head 33 can be fixed on both sides of the fixed plate 32 respectively, and a notch groove 321 is opened on the fixed plate 32 so that the connection position between the slide 38 and the contact head 33 moves in the notch groove 321.

[0069] In this embodiment, the slider 38 and the resistance coil 39 constitute a sliding rheostat. The control unit can obtain the electrical signal between the slider 38 and the resistance coil 39, and use the electrical signal as the tensioning data. When the position of the slider 38 changes, the resistance value of the sliding rheostat changes, thereby causing the electrical signal to change, and then the tensioning data of the chain 2 is obtained in real time.

[0070] In order to improve the reliability of the tensioning data, the contact plate 12 is arranged on the side of the sprocket 10 close to the inner wall of the outer shell 1, and multiple contact plates 12 are equidistantly distributed, and three contact heads 33 are arranged. The three contact heads 33 are respectively close to the loose side, tight side and bottom end of the chain 2 at the sprocket 10, and the three contact heads 33 are located on the same arc to obtain data of different contact parts between the chain 2 and the sprocket 10 and transmit them to the control unit. The tensioning data obtained from the loose side, tight side and bottom end of one sprocket 10 are averaged and recorded as c, and the tensioning data obtained from the other sprocket 10 are averaged and recorded as d. The size of c is compared with that of d, and the smaller one is taken as the execution data for adjusting the tensioning degree.

[0071] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0072] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A screw tensioning device for a hoist, comprising a housing (1) and a hoisting assembly, wherein the hoisting assembly is installed in the housing (1), the hoisting assembly comprises a rotating shaft (9), a sprocket (10) and a chain (2), the sprocket (10) being fixedly mounted on the outer peripheral surface of the rotating shaft (9), and the middle portion of the outer peripheral surface of the sprocket (10) being a gear tooth area, and both sides of the outer peripheral surface of the sprocket (10) being smooth areas, the chain (2) being meshed in the gear tooth area, characterized in that: Also includes: A tension detection mechanism, the tension detection mechanism comprising a contact plate (12) and a detection component, a plurality of the contact plates (12) are radially arranged on the surface of the sprocket (10), and one end of the contact plate (12) in the radial direction extends from the smooth area and bears the pressure of the chain (2), the contact plate (12) bearing the pressure can generate displacement in the radial direction of the sprocket (10), the detection component is arranged on one side of the sprocket (10), different displacements of the contact plate (12) can generate different pressures on the detection component, and the detection component converts the pressure into an electrical signal; An adjusting mechanism, the adjusting mechanism being arranged on one side of the sprocket (10) and being used for adjusting the height of the rotating shaft (9) so as to maintain the tension balance of the chain (2); A control unit, wherein the electrical signal detected by the detection component is transmitted to the control unit, and the control unit controls the action of the regulating mechanism according to the received electrical signal; The contact plates (12) are divided into two groups and are arranged on both sides of the sprocket (10), respectively, and the contact plates (12) on both sides are arranged in a staggered manner to obtain more detection points; Each set of contact plates (12) is equipped with a set of detection components; A single set of the detection components includes: A sliding ring (13), the sliding ring (13) being slidably disposed on the outer peripheral surface of the rotating shaft (9), a connecting rod (14) being hingedly connected between the sliding ring (13) and the contact plate (12) on the same side, and the sliding ring (13) is driven to move axially along the rotating shaft (9) when the contact plate (12) slides; a fixed ring (16), the fixed ring (16) being fixedly mounted on the outer peripheral surface of the rotating shaft (9) and being located on the other side of the sliding ring (13); a first spring (15) being arranged between the fixed ring (16) and the sliding ring (13); the first spring (15) applying pressure to the sliding ring (13) so that the sliding ring (13) always generates thrust on the contact plate (12); A sensor (21), wherein a receiving groove (131) is provided on a side of the sliding ring (13) close to the fixed ring (16), and the sensor (21) is arranged in the receiving groove (131). The sensor (21) is used to sense the pressure of the spring, and a gasket (132) is provided between the first spring (15) and the sensor (21), and the gasket (132) is located in the receiving groove (131); The sensor (21) is a resistive film pressure sensor or an annular pressure sensor.

2. A screw tensioning device for a hoist according to claim 1, characterized in that: One end of the contact plate (12) in contact with the chain (2) is arranged in an arc shape, one side of the arc is a contact side in contact with the chain (2), and the arc is inclined towards the contact side.

3. A screw tensioning device for a hoist according to claim 1, characterized in that: The adjustment mechanism comprises an actuator component and a drive component, the actuator component is connected to the rotating shaft (9), and the drive component is used to control the movement of the actuator component to change the height of the rotating shaft (9); The execution components include: A movable plate (4), the movable plate (4) being arranged outside the housing (1) near the rotating shaft (9), the housing (1) being provided with an avoidance groove (40) at the rotating shaft (9), the end of the rotating shaft (9) passing through the avoidance groove (40) and then being fixedly connected to the movable plate (4); an adjusting screw (28), the adjusting screw (28) being vertically arranged on the upper side of the movable plate (4); a fixing frame (7) being fixedly arranged on the outer wall of the housing (1); the upper end of the adjusting screw (28) being rotatably connected to the fixing frame (7); and the lower end of the adjusting screw (28) being threadably connected to the movable plate (4); The drive assembly comprises: A turbine (26), the turbine (26) being fixedly mounted on the outer peripheral surface of the upper side of the adjusting screw (28) and being coaxial with the adjusting screw (28); A transmission rod (25), wherein a mounting frame (8) is fixedly provided on the housing (1), and the mounting frame (8) penetrates through two side walls of the housing (1), and the transmission rod (25) is rotatably mounted in the mounting frame (8), and worm gears (27) are coaxially fixedly provided at both ends of the transmission rod (25), and the worm gear (27) is meshed with the turbine (26); A motor (22) is fixedly mounted in a mounting frame (8); a first gear (23) is fixedly mounted at an output end of the motor (22); and a second gear (24) meshing with the first gear (23) is coaxially fixedly mounted on the transmission rod (25).

4. A screw tensioning device for a hoist according to claim 3, characterized in that: The motor (22) is electrically connected to a control unit, and the control unit controls the motor (22) to start or stop according to an electrical signal generated by the detection component.

5. A screw tensioning device for a hoist, comprising a housing (1) and a hoisting assembly, wherein the hoisting assembly is installed in the housing (1), the hoisting assembly comprises a rotating shaft (9), a sprocket (10) and a chain (2), the sprocket (10) being fixedly mounted on the outer peripheral surface of the rotating shaft (9), and the middle portion of the outer peripheral surface of the sprocket (10) being a gear tooth area, and both sides of the outer peripheral surface of the sprocket (10) being smooth areas, the chain (2) being meshed in the gear tooth area, characterized in that: Also includes: A tension detection mechanism, the tension detection mechanism comprising a contact plate (12) and a detection component, a plurality of the contact plates (12) are radially arranged on the surface of the sprocket (10), and one end of the contact plate (12) in the radial direction extends from the smooth area and bears the pressure of the chain (2), the contact plate (12) bearing the pressure can generate displacement in the radial direction of the sprocket (10), the detection component is arranged on one side of the sprocket (10), different displacements of the contact plate (12) can generate different pressures on the detection component, and the detection component converts the pressure into an electrical signal; An adjusting mechanism, the adjusting mechanism being arranged on one side of the sprocket (10) and being used for adjusting the height of the rotating shaft (9) so as to maintain the tension balance of the chain (2); A control unit, wherein the electrical signal detected by the detection component is transmitted to the control unit, and the control unit controls the action of the regulating mechanism according to the received electrical signal; The outer surface of the sprocket (10) is radially provided with a limiting slide groove (11), and one end of the limiting slide groove (11) extends to a smooth area, the limiting slide groove (11) corresponds to the contact plate (12) one by one, and the contact plate (12) can slide in the limiting slide groove (11), and when the tension of the chain (2) is balanced, the end of the contact plate (12) away from the axis of the sprocket (10) is at least flush with the smooth area of ​​the sprocket (10); A limiting block (19) is fixedly provided on one side of the contact plate (12) away from the sprocket (10), and first concave blocks (20) fixed to the end surface of the sprocket (10) are provided on both sides of the contact plate (12), and both ends of the limiting block (19) are located in a recessed portion of the first concave block (20) and slide in the recessed portion, so as to limit the contact plate (12) from leaving the limiting slide groove (11); The detection component comprises: a second spring (30), the second spring (30) being arranged between the limit block (19) and a side of the recessed portion close to the rotating shaft (9), the second spring (30) applying pressure to the contact plate (12) toward the outer peripheral surface of the sprocket (10); A roller (31), the roller (31) being rotatably disposed on one end of the contact plate (12) close to the center of the sprocket; A contact head (33), wherein a fixing plate (32) is fixedly provided on a portion of the housing (1) close to the sprocket (10), the contact head (33) is elastically mounted on the fixing plate (32), and the contact head (33) does not rotate relative to the sprocket (10), and the roller (31) squeezes the contact head (33) when rotating with the sprocket (10), so that the contact head (33) is displaced in the radial direction of the sprocket (10); A slide (38), the slide (38) being fixedly mounted on one end of the contact head (33), the fixed plate (32) also being fixedly mounted with a resistance coil (39), the slide (38) being in contact with the resistance coil (39), the slide (38) moving together with the connecting block (34) to change the contact position between the slide (38) and the resistance coil (39); The contact plate (12) is arranged on a side of the sprocket (10) close to the inner wall of the housing (1), and a plurality of contact plates (12) are distributed at equal distances; The contact heads (33) are provided with three, and the three contact heads (33) are respectively close to the loose side, the tight side and the bottom end of the chain (2) at the sprocket (10), and the three contact heads (33) are located on the same arc.

6. A screw tensioning device for a hoist according to claim 5, characterized in that: One end of the contact plate (12) in contact with the chain (2) is arranged in an arc shape, one side of the arc is a contact side in contact with the chain (2), and the arc is inclined towards the contact side.

7. A screw tensioning device for a hoist according to claim 5, characterized in that: The adjustment mechanism comprises an actuator component and a drive component, the actuator component is connected to the rotating shaft (9), and the drive component is used to control the movement of the actuator component to change the height of the rotating shaft (9); The execution components include: A movable plate (4), the movable plate (4) being arranged outside the housing (1) near the rotating shaft (9), the housing (1) being provided with an avoidance groove (40) at the rotating shaft (9), the end of the rotating shaft (9) passing through the avoidance groove (40) and then being fixedly connected to the movable plate (4); an adjusting screw (28), the adjusting screw (28) being vertically arranged on the upper side of the movable plate (4); a fixing frame (7) being fixedly arranged on the outer wall of the housing (1); the upper end of the adjusting screw (28) being rotatably connected to the fixing frame (7); and the lower end of the adjusting screw (28) being threadably connected to the movable plate (4); The drive assembly comprises: A turbine (26), the turbine (26) being fixedly mounted on the outer peripheral surface of the upper side of the adjusting screw (28) and being coaxial with the adjusting screw (28); A transmission rod (25), wherein a mounting frame (8) is fixedly provided on the housing (1), and the mounting frame (8) penetrates through two side walls of the housing (1), and the transmission rod (25) is rotatably mounted in the mounting frame (8), and worm gears (27) are coaxially fixedly provided at both ends of the transmission rod (25), and the worm gear (27) is meshed with the turbine (26); A motor (22) is fixedly mounted in a mounting frame (8); a first gear (23) is fixedly mounted at an output end of the motor (22); and a second gear (24) meshing with the first gear (23) is coaxially fixedly mounted on the transmission rod (25).

8. A screw tensioning device for a hoist according to claim 7, characterized in that: The motor (22) is electrically connected to a control unit, and the control unit controls the motor (22) to start or stop according to an electrical signal generated by the detection component.

Images