Constant force tensioning device of hoisting box chain, hoisting box and hanging equipment

Abstract

The application relates to a constant force tensioning device for lifting box chains, a lifting box and a hanging device, and belongs to the technical field of hanging devices. The tensioning device comprises a tensioning seat, a base and an adjusting mechanism. The tensioning seat can move relative to the chain. The direction in which the tensioning seat moves relative to the chain is defined as the Y direction. The two directions perpendicular to the Y direction are the X direction and the Z direction. The tensioning seat slides along the Y positive direction and tensions the chain. The base is fixedly arranged on the side of the tensioning seat away from the chain. The adjusting mechanism comprises an elastic member and an adjusting member. The elastic member is arranged between the base and the tensioning seat and is used for driving the tensioning seat to slide along the Y positive direction. The adjusting member is connected with the elastic member and the tensioning seat and is used for cooperating with the elastic member to enable the tensioning seat to constantly tension the chain. The application can keep the chain tension constant, effectively prevent problems such as chain tooth skipping, chain disengagement and chain deviation, and guarantee the continuous and stable work of the lifting box and the matching hanging device.

Description

Technical Field

[0001] This application relates to the field of hanging equipment technology, and in particular to a constant force tensioning device for a lifting box chain, a lifting box, and a hanging equipment. Background Technology

[0002] The chain tensioning device is mainly used to maintain the chain tension, prevent slippage and tooth skipping, and ensure the stable operation of the chain.

[0003] Compared to other tensioning devices, spring tensioning is the most widely used due to its advantages such as simple structure, low price, shock absorption, and automatic displacement compensation.

[0004] However, mainstream spring tensioning devices inevitably have drawbacks during use. For example, while compensating for displacement loss, they usually cannot compensate for force loss, i.e., constant force springs, which severely limits their widespread application. Existing suspended lifting box chains inevitably become loose after a period of cyclic use, and simple spring tensioning, due to its variable output elasticity, seriously affects the reliability and lifespan of the chain. Therefore, there is an urgent need to develop a simple and reliable constant force spring tensioning device. Summary of the Invention

[0005] Therefore, it is necessary to provide a constant force tensioning device, a lifting box, and a hanging device that can achieve constant force tension on the lifting box chain.

[0006] To solve the above-mentioned technical problems, this application provides the following technical solution:

[0007] A constant force tensioning device for a lifting box chain, the tensioning device comprising:

[0008] The tensioning seat is movable relative to the chain. The direction in which the tensioning seat moves relative to the chain is defined as the Y direction, and the two directions perpendicular to the Y direction are defined as the X direction and the Z direction. The tensioning seat slides along the positive Y direction and tensions the chain.

[0009] The base is fixedly disposed on the side of the tensioning seat away from the chain;

[0010] The adjustment mechanism includes an elastic element and an adjusting element. The elastic element is disposed between the base and the tensioning seat and is used to drive the tensioning seat to slide in the positive Y direction. The adjusting element is connected to the elastic element and the tensioning seat and is used to cooperate with the elastic element to make the tensioning seat tension the chain with a constant force.

[0011] It is understood that the constant force tensioning device of this application is equipped with an adjusting element and an elastic element to keep the tensioning seat constantly tensioning the chain. Because the tension remains constant, it effectively prevents problems such as chain skipping, chain slippage, and misalignment, ensuring the continuous and stable operation of the lifting box and its supporting hanging equipment. The constant force tensioning device of this application can automatically adapt to the elongation and slack deformation of the chain after long-term use, eliminating the need for repeated manual tension adjustments and making it suitable for long-term continuous operation scenarios.

[0012] In one embodiment, the tensioning device further includes a sliding member, the adjusting member is configured as an elastic compensating member, the sliding member is slidably disposed on the base and fixed to the tensioning seat, and drives the tensioning seat to slide synchronously, the elastic member is connected between the sliding member and the base, the elastic compensating member is connected to the sliding member and cooperates with the elastic member, so that the tensioning seat outputs a constant tension force.

[0013] In one embodiment, the elastic compensation component includes a top extension element and a secondary elastic element. The secondary elastic element is connected between the top extension element and the base and is used to drive the top extension element to slide in the X direction. A force decomposition structure is provided between the top extension element and the sliding member, and the top extension element outputs a positive Y-direction force to the sliding member through the force decomposition structure.

[0014] In one embodiment, two elastic compensators are provided, which are spaced apart along the X direction and located on both sides of the slider in the X direction. The two elastic compensators can simultaneously generate a positive Y-direction component force on the slider, and one of the elastic compensators generates a positive X-direction component force on the slider, while the other elastic compensator generates a negative X-direction component force on the slider.

[0015] In one embodiment, the force decomposition structure includes a force decomposition element rotatably connected to the base. The side of the force decomposition element closer to the top extension element in the X direction is defined as a first side, and the side closer to the slider in the X direction is defined as a second side. The first side of the force decomposition element abuts against the top extension element, and the second side of the force decomposition element abuts against the slider, so that the force decomposition element generates a positive Y-direction component force on the slider.

[0016] In one embodiment, the force decomposition element has arc surfaces with the same curvature on both sides in the X direction. The two arc surfaces abut against the top extension element and the sliding member respectively, so that while the top extension element drives the force decomposition element to rotate, the force decomposition element generates a positive Y-direction component force on the sliding member.

[0017] In one embodiment, the elastic compensator further includes a limiting element, which is fixed to the base and engages with the second side of the force decomposition element to limit the force decomposition element from rotating in the second side direction; and / or, the base is provided with a guide structure to guide the extension element to slide in the X direction.

[0018] In one embodiment, the adjusting member includes a slider and a limiting seat. The base is provided with a first slide rail extending in the X direction, and the tensioning seat is provided with a second slide rail extending in the X direction. The elastic member is connected to a slider at each end in the Y direction, and the slider connected to the end of the elastic member near the tensioning seat is provided with an adjusting part. The limiting seat is connected to the base and is provided with a limiting groove, and the adjusting part is slidably connected to the limiting groove.

[0019] The first slide rail and the second slide rail are slidably connected to the two sliders at both ends of the elastic element in the Y direction, respectively, to guide the sliders to slide in the X direction. At the same time, the adjusting part slides along the limiting groove to adjust the force applied by the limiting groove to the adjusting part in the Y direction, so that the elastic element generates a constant force in the Y direction on the tensioning seat.

[0020] In one embodiment, the limiting groove extends in an arc shape. When the tensioning seat slides in the positive Y direction, the adjusting part slides unidirectionally along the limiting groove, and the Y-reverse force applied by the limiting groove to the adjusting part gradually increases.

[0021] And / or, the adjusting part is a roller, which rolls along the limiting groove.

[0022] In one embodiment, two elastic elements are configured, and the two elastic elements are spaced apart along the X direction. Each elastic element is connected to a slider at both ends. The limiting seat is provided with two limiting grooves along the X direction, which are connected to two adjusting parts on the two sliders connected to the ends of the two elastic elements near the limiting seat. One of the limiting grooves applies a force in the positive X direction to one of the adjusting parts, and the other limiting groove applies a force in the opposite X direction to the other adjusting part.

[0023] Alternatively, four elastic elements are configured, with their Y-axis projections located at the four corners of a rectangle. Each elastic element is connected to a slider at both ends. The limiting seat has two limiting grooves on each of its Z-axis sides. The two limiting grooves on the same Z-axis side are connected to two adjusting parts on the two sliders connected to the ends of two elastic elements near the limiting seat. The two limiting grooves exert opposite forces in the X-axis on the two adjusting parts.

[0024] In one embodiment, the tensioning seat has two support blocks spaced apart along the X direction on one side of the base, the limiting seat extends into the space between the two support blocks, and the two ends of the second slide rail are respectively connected to the two support blocks; and / or, the tensioning device further includes a third slide rail, which is slidably connected to the tensioning seat to guide the tensioning seat to slide along the Y direction.

[0025] This application also provides the following technical solutions:

[0026] A lifting box includes a chain and a tensioning device for tensioning the chain.

[0027] This application also provides the following technical solutions:

[0028] A hoisting device, including the aforementioned lifting box. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram showing the arrangement of the tensioning device provided in Embodiment 1 of this application at multiple tensioning points on the lifting box chain;

[0031] Figure 2 for Figure 1 A three-dimensional structural diagram of the tensioning device arranged at point D in the initial position under tension.

[0032] Figure 3 for Figure 1 Front view of the tensioning device located at point D in its initial tensioned state;

[0033] Figure 4 for Figure 1 Front view of the tensioning device located at point D in its initial tensioned state;

[0034] Figure 5 for Figure 4 middle Enlarged image;

[0035] Figure 6 for Figure 1 Front view of the tensioning device located at point D in the chain slack-tension state;

[0036] Figure 7 for Figure 1Front view of the tensioning device located at point D in the chain slack-tension state;

[0037] Figure 8 for Figure 7 middle Enlarged image;

[0038] Figure 9 for Figure 1 Force analysis diagram of the arc surface on the first side of the force decomposition element in the tensioning device arranged at point D in the initial position tension state and the chain slack tension state;

[0039] Figure 10 This is a schematic diagram of the interaction between the reversing drive surface of the top extension element and the force-bearing part on the slider in one embodiment.

[0040] Figure 11 This is a three-dimensional structural diagram of the tensioning device provided in Embodiment 2 of this application in the initial tensioned state;

[0041] Figure 12 This is a front view of the tensioning device provided in Embodiment 2 of this application in its initial tensioned state;

[0042] Figure 13 for Figure 12 middle Enlarged image;

[0043] Figure 14 This is a front view of the tensioning device provided in Embodiment 2 of this application in the state of chain slack tension;

[0044] Figure 15 for Figure 14 middle Enlarged image;

[0045] Figure 16 This is a force analysis diagram of the limiting groove in one embodiment.

[0046] The component labels are as follows:

[0047] 100. Tensioning device; 110. Base; 111. First slide rail; 120. Sliding element; 121. Head; 122. Mounting groove; 123. Arc-shaped convex surface; 124. Force-bearing part; 130. First elastic element; 140. Elastic force compensation element; 141. Secondary elastic element; 142. Top extension element; 1421. Connecting part; 1422. Top extension part; 1423. Reversing drive curved surface; 143. Force decomposition element; 1431. Arc-shaped curved surface; 144. Limiting element; 145. Pin; 150. Tensioning seat; 151. Groove; 152. Support block; 153. Second slide rail; 160. Limiting seat; 161. Limiting groove; 170. Second elastic element; 180. Slider; 200. Chain. Detailed Implementation

[0048] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0049] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application's specification are for illustrative purposes only and do not represent the only possible implementation.

[0050] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0051] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0052] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items.

[0053] Please see Figures 1 to 16This application provides a constant-force tensioning device for a lifting box chain, which is used as part of the lifting box in hoisting equipment. In hoisting equipment, chain systems are often used to lift loads such as clothes hangers. The chain system includes a lifting box, which houses a main gear, an auxiliary wheel, a chain 200, and a motor. The chain 200 is connected to the main gear and the auxiliary wheel. The motor drives the main gear to rotate, which in turn drives the chain 200 to move upwards, thus lifting the load to a higher height. The working principle of the chain system can be found in existing technology. Addressing the shortcoming of existing tensioning devices 100 that cannot achieve constant-force tension of the chain 200 during use, the constant-force tensioning device for the lifting box chain in this application aims to achieve constant-force tension of the chain 200.

[0054] Specifically, please refer to Figures 1 to 16 The tensioning device 100 includes a base 110, a tensioning seat 150, and an adjusting mechanism. The tensioning seat 150 is movable relative to the chain 200. The direction of movement of the tensioning seat 150 relative to the chain 200 is defined as the Y-axis, and the two directions perpendicular to the Y-axis are the X-axis and Z-axis. The tensioning seat 150 slides along the positive Y-axis and tensions the chain 200. The base 110 is fixedly disposed on the side of the tensioning seat 150 away from the chain 200, while the tensioning seat 150 slides relative to the base 110 to tension the chain 200. The adjusting mechanism includes an elastic element and an adjusting element. The elastic element is disposed between the base 110 and the tensioning seat 150 and is used to drive the tensioning seat 150 to slide along the positive Y-axis. The adjusting element is connected to the elastic element and the tensioning seat 150 and is used to cooperate with the elastic element to make the tensioning seat 150 tension the chain 200 with a constant force.

[0055] The structure of the tensioner 150 can refer to existing technology. Here, the tensioner 150 is designed as a semi-circular structure with a groove 151 on the outer circular surface, which forms a limiting fit with the chain 200.

[0056] It is understandable that the constant force tension chain 200 here means maintaining a roughly constant force, allowing for a certain deviation, such as within 5%. The preferred elastic element is a compression spring. Spring tensioning is the most widely used because it has advantages such as simple structure, low cost, shock absorption, and automatic displacement compensation. Of course, other elastic elements can be used instead of compression springs, such as highly elastic rubber components.

[0057] The tensioning device 100 of this application is equipped with an adjusting element and an elastic element that cooperate to tension the chain 200 with a constant force by the tensioning seat 150. Because the tension force is kept constant, it can effectively prevent problems such as chain skipping, chain derailment, and deviation of the chain 200, and ensure the continuous and stable operation of the lifting box and the supporting hanging equipment.

[0058] The tensioning device 100 of this application can automatically adapt to the elongation and slack deformation of the chain 200 after long-term use, without the need for repeated manual adjustment of tension, and is suitable for the use scenario of long-term continuous operation of the equipment.

[0059] Example 1

[0060] Please see Figures 1 to 8 The tensioning device 100 also includes a sliding member 120 and an adjusting member configured as an elastic compensation member 140. Here, the elastic member is named the first elastic member 130. The sliding member 120 is slidably disposed on the base 110 and fixed to the tensioning seat 150, and is used to drive the tensioning seat 150 to slide synchronously. The first elastic member 130 is connected between the sliding member 120 and the base 110, and is used to drive the sliding member 120 to slide in the positive Y direction, so that the tensioning seat 150 tensions the chain 200. The elastic compensation member 140 is connected to the sliding member 120 and is used to compensate for the elastic force lost by the first elastic member 130, thereby cooperating with the first elastic member 130 to make the tensioning seat 150 tension the chain 200 with a constant force.

[0061] The slider 120 slides relative to the base 110, and the slider 120 can be designed as a rectangular structure. Since the basic tension force is mainly provided by the first elastic element 130, the elastic force compensation element 140 makes up for the insufficient elastic force of the first elastic element 130. Therefore, the elastic force of the first elastic element 130 is usually greater than the elastic force of the elastic force compensation element 140.

[0062] The first elastic element 130 is initially in a compressed state. When the chain 200 relaxes, the first elastic element 130 extends and releases its elastic force, driving the sliding element 120 to slide in the positive Y direction. The basic tension is mainly provided by the first elastic element 130, while the elastic force compensation element 140 dynamically compensates for the elastic force loss of the first elastic element 130. The two work together to counteract the tendency of the elastic force attenuation of the first elastic element 130, maintaining the tension of the tensioning seat 150 on the chain 200 at a basically constant level.

[0063] As the chain 200 gradually stretches and loosens over long-term use, the sliding member 120 follows the elongation of the first elastic member 130, continuously sliding in the same direction. The tensioning seat 150 simultaneously moves forward to tighten the chain 200, automatically adapting to the amount of slack and eliminating the need for frequent manual tension adjustments. This constant tension ensures uniform meshing clearance in the chain 200 transmission, preventing looseness, jumps, excessive tension, and fatigue during operation. This reduces chain wear, skipped teeth, jamming, and abnormal noise, effectively improving the reliability of the chain 200.

[0064] In one embodiment, the elastic compensation member 140 includes a top extension element 142 and a secondary elastic element 141. The secondary elastic element 141 is connected between the top extension element 142 and the base 110 and is used to drive the top extension element 142 to slide in the X direction. A force decomposition structure is provided between the top extension element 142 and the sliding member 120 so that the top extension element 142 can generate a positive Y-direction component force on the sliding member 120.

[0065] It is understandable that the top extension element 142 and the secondary elastic element 141 are distributed along the X-direction, with the top extension element 142 located closer to the slider 120. The first elastic element 130 is responsible for basic tensioning, and the secondary elastic element 141 is responsible for compensating for the elastic force attenuation of the first elastic element 130. Their movement directions are perpendicular to each other, and their forces do not interfere with each other. In addition, the positive Y-direction component force generated by the top extension element 142 on the slider 120 corresponds to the displacement of the slider 120 along the positive Y-direction; that is, the greater the displacement, the greater the component force. The secondary elastic element 141 and the top extension element 142 are arranged along the X-direction mainly to avoid occupying the Y-direction tensioning stroke space, resulting in a compact structural layout suitable for narrow installation spaces. Among them, the force decomposition structure can accurately convert the lateral driving force of the secondary elastic element 141 into a compensating thrust in the same direction as the tensioning of the first elastic element 130. The force transmission path is clear, and the direction of the compensating force is completely consistent with the tensioning direction of the chain 200. The greater the tension displacement of the sliding member 120, the more the elastic force of the first elastic member 130 decreases. The lateral pushing stroke of the extension element 142 changes synchronously, and the same-direction compensation component force output by force decomposition increases synchronously. It can match the amount of elastic force loss of the first elastic member 130 in real time and dynamically complete the elastic force replenishment.

[0066] In one embodiment, two elastic compensators 140 are provided, which are spaced apart along the X direction and located on both sides of the slider 120 in the X direction. The two elastic compensators 140 can simultaneously generate a positive Y-direction component force on the slider 120; one elastic compensator 140 generates a positive X-direction component force on the slider 120, and the other elastic compensator 140 generates a negative X-direction component force on the slider 120.

[0067] It is understandable that the sum of the two positive Y-direction component forces generated by the two elastic compensators 140 on the slider 120 can compensate for the loss of elastic force in the first elastic element 130, i.e., they are approximately equal, for example, with an error of no more than 5%. The X-direction component forces of the two elastic compensators 140 are opposite in direction and can cancel each other out. Therefore, the superposition of the positive Y-direction component forces generated by the two elastic compensators 140 can match the elastic force attenuation of the first elastic element 130. After being superimposed with the remaining elastic force of the first elastic element 130, the overall tension force remains basically constant, solving the problem of continuous decrease in tension force of a single elastic element and ensuring consistent tension of the chain 200 throughout its entire length. The X-direction component forces generated by the two elastic compensators 140 counteract each other, leaving no residual force acting on the slider 120, causing the slider 120 to slide only along a preset positive Y-direction straight line, effectively preventing the slider 120 from tilting or shifting. The slider 120 experiences symmetrical and uniform force on both sides, with its center of gravity centered, resulting in smooth sliding operation.

[0068] In one embodiment, the force decomposition structure includes a force decomposition element 143, which is rotatably connected to the base 110. The side of the force decomposition element 143 closer to the top extension element 142 in the X direction is defined as the first side, and the side closer to the slider 120 in the X direction is defined as the second side. The first side of the force decomposition element 143 abuts against the top extension element 142, and the second side of the force decomposition element 143 acts on the slider 120. The force decomposition element 143 generates a positive Y-direction component force on the slider 120.

[0069] Understandably, by relying on the rotation of the force decomposition element 143 to complete the force direction conversion, the force exerted by the secondary elastic element 141 and the extension element 142 along the X direction is smoothly converted into the Y-direction thrust required for the tension of the chain 200, and the force transmission path is simple and reliable. When the sliding member 120 is displaced as the chain 200 relaxes, the force decomposition element 143 can synchronously follow the deflection and swing, automatically adapting to the X-direction feed stroke of the extension element 142, so that the output compensation component can change synchronously with the elongation of the first elastic element 130, matching the elastic force attenuation amplitude in real time, and the compensation and following performance is good. Moreover, the force decomposition element 143 uses the swing to convert the force direction, and can complete the conversion of the force to the Y-direction thrust in a narrow space, making full use of the empty space inside the base 110.

[0070] In one embodiment, the force decomposition element 143 is a fully arc-shaped circular plate structure. The force decomposition element 143 has two arc surfaces 1431 on both sides in the X direction. The two arc surfaces 1431 abut against the top extension element 142 and the sliding member 120 respectively, so that while the top extension element 142 drives the force decomposition element 143 to rotate, the force decomposition element 143 generates a positive Y-direction component force on the sliding member 120.

[0071] Understandably, the curves of the two arc surfaces 1431 are identical, with the apex of the arc protruding towards the slider 120. As the slider 120 moves forward in the positive Y direction and the first elastic element 130 continues to elongate while its elastic force gradually decreases, the extension element 142 advances synchronously in the X direction. Relying on the contact transmission characteristics of the arc surfaces 1431 with the same curvature and direction of protrusion, the positive Y-direction compensation force output by the force decomposition element 143 can increase regularly with the displacement of the slider 120, perfectly matching the elastic force attenuation curve of the first elastic element 130. This ensures that the compensation force is synchronously replenished according to the amount of elastic force loss, maintaining a constant resultant force throughout the process. This is the core structural guarantee for achieving constant force tension. The identical arc curves on both sides and the identical force transmission patterns and force value change rhythms of the two elastic compensation components, combined with the X-direction force cancellation structure, not only ensure that the compensation forces on both sides are equally superimposed, but also further ensure that the lateral forces are precisely counteracted. The slider 120 always moves in a straight line in the center without any deviation or skew. Taking the two elastic compensating members 140 as an example, the above design can enable the force decomposition element 143 to generate a component force in the first direction on the sliding member 120 to compensate for half of the elastic force lost by the first elastic member 130 due to elongation.

[0072] Specifically, the force decomposition element 143 has a circular part at one of its positive Y-direction ends, and the circular part is rotatably connected to the base 110 via a pin 145.

[0073] The following section calculates the contour curve of the arc surface 1431. The arc curves shown below do not represent the actual contour, but are only for simulation calculation. The actual contour is subject to the calculation results:

[0074] Figure 9 The diagram shows the force analysis of the arc surface 1431 on the first side of one of the force decomposition elements 143 in the initial tensioned state and the relaxed tensioned state of the chain 200. Point A corresponds to the initial tensioned state, and point B corresponds to the relaxed tensioned state of the chain 200. Let the elastic force of the secondary elastic element 141 after compression be F. 副 Since the amplitude of the oscillation of the force decomposition element 143 around the pin is very small, it can be approximated that F 副 Let F be a constant force; draw a tangent to the arc at point B, then under the constant force F... 副 Under the action of the sliding member 120, the pressure is Fn, Fn=F 副 ·cosθ, the direction is perpendicular to the tangent; decompose Fn into an X-direction component and a Y-direction component, where the two X-direction Fx components cancel each other out, Fy=Fn·sinθ. When the contact point between the arcuate convex surfaces 123 on both sides of the slider 120 and the force decomposition element 143 slides from A to B, it can be seen that the angle θ increases significantly, Fy increases significantly, while the first elastic element 130 loses part of the elastic force F due to elongation. 损 Therefore, in order for the positive component force of Y to compensate for the loss of elastic force in the principal elastic element, 2Fy=F must be satisfied. 损Let F 损 =k·nx,F 副 =ak·x(n>0,a>0), therefore the following formula must be satisfied:

[0075] 2ak·x·cosθ·sinθ=k·nx.

[0076] Simplifying, we get the circular arc curve:

[0077] Sin2θ=n / a.

[0078] In one embodiment, the elastic compensator 140 further includes a limiting element 144 fixed to the base 110. The limiting element 144 engages with the second side of the force decomposition element 143 to limit the rotation angle of the force decomposition element 143. The limiting element 144 may be a limiting post, which is perpendicular to the force decomposition element 143.

[0079] Understandably, the setting of the limiting element 144 can effectively constrain the maximum deflection angle of the force decomposition element 143, prevent it from swinging excessively, and eliminate the problems of failure of the component force transmission and loss of control of the compensation force caused by excessive swing angle, so that the force decomposition element 143 always moves within the preset effective working angle range.

[0080] Specifically, the extending element 142 includes a flat connecting portion 1421 and a columnar extending portion 1422. The connecting portion 1421 is connected to the secondary elastic element 141, and the head end of the extending portion 1422 abuts against the first side of the force decomposition element 143. The flat connecting portion 1421 increases the contact area with the secondary elastic element 141. A mounting groove 151 and a mounting post can be provided on the connecting portion 1421 to position the secondary elastic element 141. Similarly, a mounting groove 151 and a mounting post can also be provided on the base 110 to position the secondary elastic element 141, ensuring that both ends of the secondary elastic element are positioned. The columnar extending portion 1422 concentrates the force, allowing the force of the secondary elastic element 141 to be precisely applied to the preset position of the force decomposition element 143, reducing force loss and ensuring efficient force conversion.

[0081] Furthermore, the base 110 is provided with a guide structure, such as a guide rail, to guide the extension element 142 to slide in the X direction. The guide structure can limit the extension element 142 to slide only in a straight line in the X direction, preventing skewness and torsion during operation and ensuring the stability of the lateral thrust direction.

[0082] In one embodiment, the slider 120 has a T-shaped structure. The end of the slider 120 away from the tensioning seat 150 has a head 121, and the head 121 has a mounting groove 122 that connects to one end of the first elastic element 130. Both sides of the head 121 have arc-shaped convex surfaces 123 that are subjected to the force of the elastic compensation element 140. The T-shaped head 121 is larger than the rod-shaped structure, allowing sufficient space for the mounting groove 122, facilitating the installation of the first elastic element 130 with its large wire diameter and large outer diameter, thus ensuring sufficient elastic force from the first elastic element 130. The arc-shaped convex surface 123 is a continuous arc-shaped contact surface. When the arc surface 1431 of the force decomposition element 143 applies force, the contact point can smoothly switch with the movement of the component, adapting to force transmission under different contact angles. Even when the stroke of the extension element 142 changes or the angle of the force decomposition element 143 changes, it can still stably receive the effective positive Y-axis force, ensuring the stability of the elastic compensation effect throughout the process.

[0083] It is understood that a mounting groove 122 or a mounting post connected to the other end of the first elastic member 130 can be provided on the base 110, so that both ends of the first elastic member 130 are positioned.

[0084] In one embodiment, the base 110 is provided with a receiving groove, and the first elastic member 130 and the elastic compensation member 140 are both provided in the receiving groove. The receiving groove is provided with a Y-direction sliding groove near the side wall of the tensioning seat 150, and the sliding member 120 slides through the Y-direction sliding groove. The cross sections of the two can be in a rectangular structure to fit together.

[0085] Understandably, the first elastic element 130 and the elastic compensation element 140 are both arranged inside the receiving groove to avoid occupying external space, reduce space occupation, and make the overall structure compact. In addition, the Y-direction slide guides the sliding element 120 to slide, limiting it to linear sliding only along the tensioning direction, effectively preventing deviation and torsion, and ensuring precise and controllable tensioning action.

[0086] In one embodiment, the force-resolving element 143 described above may be omitted, and instead, the extending element 142 and the sliding member 120 may interact directly. Please refer to [link / reference needed]. Figure 10The force decomposition structure includes a reversing drive surface 1423 provided on the top extension element 142 and a force receiving part 124 provided on the slider 120. The reversing drive surface 1423 and the force receiving part 124 interact to generate a positive Y-direction component force on the slider 120 by the top extension element 142. The force-bearing part 124 can be an arc protrusion protruding in the opposite direction of Y. It can be understood that the curve design of the reversing drive surface 1423 can refer to the design of the arc surface 1431. When the slider 120 moves forward in the positive Y direction and the first elastic element 130 continues to extend and the elastic force gradually decreases, the top extension element 142 advances synchronously in the X direction. Relying on the action of the reversing drive surface 1423 and the force-bearing part 124, the positive Y compensation force output by the top extension element 142 increases regularly with the displacement of the slider 120, which fits the elastic force decay curve of the first elastic element 130. This ensures that the amount of elastic force loss is compensated by the amount of compensation force, and the resultant force remains constant throughout the process. This eliminates the need for the intermediate force decomposition element 143. The force is transferred by direct contact between the reversing drive surface 1423 of the top extension element 142 and the force-bearing part 124 of the sliding member 120. This results in fewer parts, a shorter force transmission link, higher transmission efficiency, and more timely elastic compensation response. By relying on the cooperation between the reversing drive surface 1423 and the inclined / arc surface of the force-bearing part 124, the sliding thrust of the top extension element 142 along the X direction can be smoothly decomposed into the positive Y component force. When the displacement and contact angle of the sliding member 120 change dynamically, the surface can adaptively fit and maintain stable force output throughout the process.

[0087] It is understood that the tensioning device 100 in this embodiment can be installed at multiple locations on the chain 200. Figure 1 For example, positions A and B are installed on the X-opposite side of chain 200, position C is installed on the X-positive side of chain 200, and position D is installed on the Y-opposite side of chain 200.

[0088] Example 2

[0089] Please see Figures 11 to 15Unlike Embodiment 1, in this embodiment, the adjusting component includes a slider 180, a limiting seat 160, a first slide rail 111 extending in the X direction on the base 110, and a second slide rail 153 extending in the X direction on the tensioning seat 150. Here, the elastic component is named the second elastic component 170. The limiting seat 160 is fixedly installed. The second elastic element 170 is connected to a slider 180 at each end in the Y direction. The first slide rail 111 is connected to the base 110 and the slider 180 connected to the end of the second elastic element 170 near the base 110, and is used to guide the slider 180 to slide in the X direction. The second slide rail 153 is connected to the limiting seat 160 and the slider 180 connected to the end of the second elastic element 170 near the limiting seat 160, and is used to guide the slider 180 to slide in the X direction. The limiting seat 160 is provided with a limiting groove 161. The slider 180 connected to the positive Y direction end of the second elastic element 170 is provided with an adjustment part. The adjustment part slides along the limiting groove 161 while the slider 180 slides, so as to adjust the force applied by the limiting groove 161 to the adjustment part in the opposite Y direction, so that the second elastic element 170 generates a constant force in the positive Y direction on the tensioning seat 150.

[0090] After the chain 200 is relaxed, the sliders 180 at both ends of the second elastic element 170 slide along the first slide rail 111 and the second slide rail 153 respectively, while the adjusting part slides along the limiting groove 161. The contour design of the limiting groove 161 can satisfy the change of the force applied by the limiting groove 161 to the adjusting part in the Y-direction. For example, when the tensioner 150 slides in the forward Y direction, the adjusting part slides unidirectionally along the limiting groove 161, and the force applied to the adjusting part in the Y-direction gradually increases.

[0091] Understandably, the second elastic element 170 possesses a pushing force along the positive Y direction, which normally acts directly on the tensioning seat 150 to press the chain 200. The limiting groove 161 applies a Y-reverse canceling force to the adjusting part, which cancels part of the original elastic force of the second elastic element 170, weakening the initial tension. When the chain 200 becomes slack, the second elastic element 170 pushes the adjusting slider 180 to slide along the X direction, and the adjusting part moves synchronously along the trajectory of the limiting groove 161. Relying on the limiting groove 161 structure with a preset contour, the Y-reverse canceling force gradually decreases during the sliding process; the effective output tension of the second elastic element 170 is then compensated and increases. Since the attenuation amplitude of the Y-reverse canceling force matches and cancels the attenuation amplitude of the elastic force of the second elastic element 170, the difference in tension change is ultimately canceled, maintaining a constant overall output tension. On the one hand, the tension change is automatically compensated by the mechanical linkage of the adjusting mechanism, eliminating the need for repeated manual adjustment of the tension. On the other hand, the tension of chain 200 remains basically stable throughout the entire relaxation process, which adapts to the deformation conditions of chain 200 and improves the reliability and lifespan of chain 200.

[0092] In one embodiment, the limiting groove 161 extends in an arc shape. When the tensioning seat 150 slides in the positive Y direction, the limiting groove 161 exerts a larger force on the adjusting part in the opposite Y direction as the adjusting part slides unidirectionally along the limiting groove 161.

[0093] refer to Figure 16 The force diagram of the limiting groove 161 shown indicates that point A corresponds to the initial tensioned position, point B corresponds to the relaxed tensioned position of the chain 200, and the elastic force F of the second elastic element 170 is shown. 弹 For the positive Y direction, the support reaction force of the limiting groove 161 to the adjusting part is Fn, where Fn = Fn' = F 弹 The reaction force acting on the adjusting part can be divided into an X-axis component Fnx and a Y-axis component Fny. Fnx cancels out the reaction force in the X-axis, and Fny = Fn·cosθ = F 弹 cos 2 θ; The elastic force output by a single second elastic element 170 to the chain 200 is F. 输出 =F 弹 -Fny, after chain 200 is relaxed, the adjusting part moves from point A to point B, and the second elastic element 170 has a spring force F. 弹 As Fny decreases, the output elastic force also decreases. Assuming the output elastic force is constant at aN, the following formula should be satisfied:

[0094] F 弹 =na(n>0)

[0095] Fny = ma (m > 0)

[0096] nm=1

[0097] Simplifying, the curve of the limiting groove 161 arc surface is cos 2 θ = 1 - 1 / n.

[0098] Understandably, the arc-shaped contour of the limiting groove 161 can be designed with curvature as needed. During the sliding stroke of the adjusting part along the limiting groove 161, the Y-direction reverse resisting force can be smoothly and continuously changed, precisely matching the elastic force attenuation curve of the second elastic element 170, effectively offsetting elastic force fluctuations, and stably maintaining a constant tension of the chain 200. The arc-shaped adjustment trajectory conforms to the movement posture of the adjusting part, resulting in low movement resistance and low friction loss. This ensures the flexibility of the slider 180's sliding and also delays wear and aging of the limiting groove 161 and the adjusting part, extending the structural service life. By adjusting the arc curvature and arc length parameters, the increase or decrease in the Y-direction reverse force and the adjustment range can be flexibly set to adapt to the constant tension requirements of different specifications of chain 200 and different second elastic elements 170. Of course, it is understandable that the limiting groove 161 can also be designed as a slanted straight groove. Similarly, the slope of the slanted straight groove also needs to be designed accordingly to match the elastic force attenuation curve of the second elastic element 170.

[0099] In one embodiment, the adjusting part is a roller that rolls along the limiting groove 161. Of course, it can also be replaced with a rolling structure such as a ball bearing or a bearing.

[0100] Understandably, replacing sliding contact with rolling reduces the friction between the roller and the limiting groove 161, resulting in less sliding resistance for the slider 180 and a more sensitive response from the adjustment mechanism. This reduces the likelihood of jamming or stuckness, ensuring continuous and stable tension adjustment. Furthermore, rolling friction wear is far lower than sliding friction, slowing down wear on the roller and limiting groove 161 and extending the service life of the components.

[0101] In one embodiment, two second elastic members 170 are provided, and the two second elastic members 170 are spaced apart along the X direction. Each end of the second elastic member 170 is connected to a slider 180. The limiting seat 160 is provided with two limiting grooves 161 along the X direction, which are connected to two adjusting parts on the two sliders 180 connected to the ends of the two second elastic members 170 near the limiting seat 160. One limiting groove 161 applies a force in the positive X direction to one of the adjusting parts, and the other limiting groove 161 applies a force in the opposite X direction to the other adjusting part.

[0102] Understandably, due to the arc-shaped contour of the limiting groove 161, the reaction force it applies to the adjusting part is obliquely Y-shaped and opposite, which can be broken down into two components, X and Y. The X-shaped components of the two sets of structures are opposite in direction and cancel each other out, with no lateral load moment, while the Y-shaped components are superimposed in the same direction, and the combined force cancels out the elastic force of the second elastic element 170, precisely weakening the initial tension of the chain 200. The two X-shaped components are opposite in direction and counterbalance each other, preventing the slider 180 and the second elastic element 170 from unilaterally swaying, ensuring that the tensioning seat 150 always applies force directly to the chain 200. The superposition of the Y-shaped components can efficiently match the change in the elastic force of the second elastic element 170, and in conjunction with the change in the arc-shaped contour trajectory of the limiting groove 161, stably compensate for tension and reliably achieve constant force output.

[0103] In one embodiment, four second elastic elements 170 are provided, and the Y-direction projections of the four second elastic elements 170 are located at the four corners of a rectangle. Each end of the second elastic element 170 is connected to a slider 180. The limiting seat 160 is provided with two limiting grooves 161 on each side in the Z direction. The two limiting grooves 161 provided on the same side in the Z direction are connected to two adjusting parts on the two sliders 180 connected to the end of the two second elastic elements 170 near the limiting seat 160, and the two limiting grooves 161 exert opposite forces in the X direction on the two adjusting parts.

[0104] Understandably, the four sets of second elastic elements 170 arranged at the four corners of the rectangle provide a wider distribution of stress points compared to a double second elastic element 170 structure. This allows for comprehensive distribution of tension loads, eliminating localized stress concentrations and significantly improving overall stress uniformity. The reaction force of the arc-shaped limiting groove 161 is still decomposed into X- and Y-axis components. The X-axis components generated by the two limiting grooves 161 on the same side counteract each other, eliminating lateral offset torque. The Y-axis components are superimposed in the same direction, jointly offsetting the output elastic force of the second elastic element 170, ensuring the basic function of tension adjustment. The superimposed effect of the four structures provides a wider range of counteracting forces, adapting to the tensioning conditions of large-specification, high-load chains 200, and making constant force adjustment applicable to a wider range of scenarios. The four-corner support layout has stronger rigidity, less swaying and deformation during operation, better consistency in adjustment response, and maintains a constant tension effect for a long time, resulting in higher equipment reliability.

[0105] Based on the above analysis, the number of second elastic elements 170 is preferably even, so that the X-direction components generated by the two limiting grooves 161 can counteract each other. Of course, the number can also be increased or decreased.

[0106] In one embodiment, two support blocks 152 are spaced apart along the side of the tensioning seat 150 near the base 110, and a limiting seat 160 extends into the space between the two support blocks 152. The two ends of the second slide rail 153 are respectively connected to the two support blocks 152. That is, the inner side of the semicircle of the tensioning seat 150 is connected to the support blocks 152.

[0107] Understandably, the two support blocks 152 provide mounting positions for the second slide rail 153. The two ends of the second slide rail 153 are mounted on the support blocks 152 to form a span-type fixed structure. The overall support rigidity is high, and it is not easy to deform or loosen during the sliding process. Of course, it also allows the limiting seat 160 and the slider 180 connected to the end of the second elastic element 170 near the limiting seat 160 to extend into the space between the two support blocks 152, so that the slider 180 and the second slide rail 153 form a sliding fit, and the two support blocks 152 respectively limit the slider 180.

[0108] Specifically, the support block 152 and the tensioning seat 150 are an integral structure. This reduces the number of parts, simplifies the assembly process, and reduces processing and assembly errors. The Y-direction cross-section of the support block 152 is a T-shaped structure, with the T-shaped head at the opposite end of the Y direction. This corresponds to the arrangement of four sets of second elastic elements 170, which facilitates the connection of the Z-direction sides of the T-shaped head 121 to the two second slide rails 153 respectively, while the limiting element extends between the two second slide rails 153.

[0109] In one embodiment, the second slide rail 153 is a cylindrical slide rail, and the slider 180 is provided with a circular hole that slides and engages with the cylindrical slide rail. The circular hole is slidably nested on the outer circle of the cylindrical slide rail. In this way, the circular hole on the slider 180 and the cylindrical surface of the first slide rail 111 fit together on the circumferential surface, resulting in low sliding resistance, allowing the slider 180 to slide flexibly, and providing timely response to tension adjustment actions.

[0110] In one embodiment, the first slide rail 111 is a linear groove, and the slider 180 connected to the end of the second elastic member 170 near the base 110 has a sliding part, which is slidably connected to the linear groove. Taking the arrangement of four sets of second elastic members 170 as an example, two first slide rails 111 are spaced apart along the Z direction on the base 110, and the two first slide rails 111 are located on both sides of the limiting seat 160 in the Z direction.

[0111] Understandably, the linear groove limits the sliding trajectory of slider 180, and slider 180 moves smoothly in a predetermined direction without deviation.

[0112] Furthermore, both the sliding part and the slide groove are T-shaped structures. The T-shaped interlocking structure can firmly restrict the Y-direction movement and disengagement. The slider 180 can only move along the slide groove direction, which restricts the slider 180 from flipping and shaking. The sliding posture is always regular, eliminating the problem of deviation and disengagement.

[0113] In one embodiment, the tensioning device 100 further includes a third slide rail, which is slidably connected to the tensioning seat 150 and is used to guide the tensioning seat 150 to slide in the Y direction.

[0114] It is understandable that the third slide rail and the tensioning seat 150 can also adopt a T-type sliding fit structure. The third slide rail can constrain the tensioning seat 150 to only move in the Y direction, avoid the tensioning seat 150 from tilting, and ensure that the chain 200 is tensioned in the Y direction.

[0115] In one embodiment, the base 110 and the limiting seat 160 are an integral structure. This integral design reduces the number of parts, simplifies assembly processes, and lowers processing and assembly errors. The limiting seat 160 is a flat plate structure, perpendicular to the base 110, and stiffening ribs connect the two on both sides in the X direction.

[0116] Similarly to the embodiment, the tensioning device 100 in embodiment two can also be installed at multiple locations on the chain 200. For example, replacing... Figure 1 The tensioning devices 100 are shown in the diagram at various locations.

[0117] It is understood that the tensioning device 100 in this embodiment can be used not only in lifting boxes and hoisting equipment, but also in other equipment that uses the chain 200.

[0118] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0119] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the scope of protection of this application. Therefore, the patent protection scope of this application should be determined by the appended claims.

Claims

1. A constant force tensioning device for a lifting box chain, characterized in that, The tensioning device (100) includes: The tensioning seat (150) is movable relative to the chain (200). The direction in which the tensioning seat (150) moves relative to the chain (200) is defined as the Y direction, and the two directions perpendicular to the Y direction are the X direction and the Z direction. The tensioning seat (150) slides along the positive Y direction and tensions the chain (200). The base (110) is fixedly disposed on the side of the tensioning seat (150) away from the chain (200); The adjustment mechanism includes an elastic element and an adjustment element. The elastic element is disposed between the base (110) and the tensioning seat (150) and is used to drive the tensioning seat (150) to slide in the positive Y direction. The adjustment element is connected to the elastic element and the tensioning seat (150) and is used to cooperate with the elastic element to make the tensioning seat (150) tension the chain (200) with a constant force.

2. The constant force tensioning device for the lifting box chain according to claim 1, characterized in that, The tensioning device (100) further includes a sliding member (120), the adjusting member is configured as an elastic compensating member (140), the sliding member (120) is slidably disposed on the base (110) and fixed to the tensioning seat (150), and drives the tensioning seat (150) to slide synchronously, the elastic member is connected between the sliding member (120) and the base (110), the elastic compensating member (140) is connected to the sliding member (120) and cooperates with the elastic member to make the tensioning seat (150) output a constant tension force.

3. The constant force tensioning device for the lifting box chain according to claim 2, characterized in that, The elastic compensator (140) includes a top extension element (142) and a secondary elastic element (141). The secondary elastic element (141) is connected between the top extension element (142) and the base (110) and is used to drive the top extension element (142) to slide in the X direction. A force decomposition structure is provided between the top extension element (142) and the sliding member (120). The top extension element (142) outputs a positive Y component force to the sliding member (120) through the force decomposition structure.

4. The constant force tensioning device for the lifting box chain according to claim 3, characterized in that, Two elastic compensators (140) are provided, and the two elastic compensators (140) are spaced apart along the X direction and are respectively located on both sides of the slider (120) in the X direction. The two elastic compensators (140) can simultaneously generate a positive Y component force on the slider (120), and one of the elastic compensators (140) generates a positive X component force on the slider (120), while the other elastic compensator (140) generates a negative X component force on the slider (120).

5. The constant force tensioning device for the lifting box chain according to claim 4, characterized in that, The force decomposition structure includes a force decomposition element (143), which is rotatably connected to the base (110). The side of the force decomposition element (143) closer to the top extension element (142) in the X direction is defined as the first side, and the side closer to the slider (120) in the X direction is defined as the second side. The first side of the force decomposition element (143) abuts against the top extension element (142), and the second side of the force decomposition element (143) abuts against the slider (120), so that the force decomposition element (143) generates a positive Y-direction component force on the slider (120).

6. The constant force tensioning device for the lifting box chain according to claim 5, characterized in that, The force decomposition element (143) has circular arc surfaces (1431) with the same curvature on both sides in the X direction. The two circular arc surfaces (1431) abut against the top extension element (142) and the sliding member (120) respectively, so that while the top extension element (142) drives the force decomposition element (143) to rotate, the force decomposition element (143) generates a positive Y-direction component force on the sliding member (120).

7. The constant force tensioning device for the lifting box chain according to claim 5, characterized in that, The elastic compensator (140) further includes a limiting element (144), which is fixed to the base (110) and engages with the second side of the force decomposition element (143) to limit the force decomposition element (143) from rotating in the second side direction; and / or, the base (110) is provided with a guide structure to guide the extension element (142) to slide in the X direction.

8. The constant force tensioning device for the lifting box chain according to claim 1, characterized in that, The adjusting component includes a slider (180) and a limiting seat (160). The base (110) is provided with a first slide rail (111) extending in the X direction, and the tensioning seat (150) is provided with a second slide rail (153) extending in the X direction. The elastic element is connected to one slider (180) at each end in the Y direction, and the slider (180) connected to the end of the elastic element near the tensioning seat (150) is provided with an adjusting part. The limiting seat (160) is connected to the base (110) and is provided with a limiting groove (161). The adjusting part is slidably connected to the limiting groove (161). The first slide rail (111) and the second slide rail (153) are slidably connected to the two sliders (180) connected to the two ends of the elastic member in the Y direction, respectively, to guide the sliders (180) to slide in the X direction. At the same time, the adjusting part slides along the limiting groove (161) to adjust the force applied by the limiting groove (161) to the adjusting part in the Y direction, so that the elastic member generates a constant force in the Y direction on the tensioning seat (150).

9. The constant force tensioning device for the lifting box chain according to claim 8, characterized in that, The limiting groove (161) extends in an arc shape. When the tensioning seat (150) slides in the positive Y direction, the adjusting part slides unidirectionally along the limiting groove (161), and the Y reverse force applied by the limiting groove (161) to the adjusting part gradually increases. And / or, the adjusting part is a roller that rolls along the limiting groove (161).

10. The constant force tensioning device for the lifting box chain according to claim 8, characterized in that, Two elastic elements are configured, and the two elastic elements are spaced apart along the X direction. Each elastic element is connected to a slider (180) at both ends. The limiting seat (160) is provided with two limiting grooves (161) along the X direction, which are connected to two adjusting parts on the two sliders (180) connected to the ends of the two elastic elements near the limiting seat (160). One of the limiting grooves (161) applies a force in the positive X direction to one of the adjusting parts, and the other limiting groove (161) applies a force in the opposite X direction to the other adjusting part. Alternatively, four elastic elements are configured, with the Y-direction projections of the four elastic elements located at the four corners of a rectangle. Each elastic element is connected to a slider (180) at both ends. The limiting seat (160) is provided with two limiting grooves (161) on each side in the Z direction. The two limiting grooves (161) provided on the same side in the Z direction are connected to two adjusting parts on the two sliders (180) connected to the ends of two elastic elements near the limiting seat (160). The two limiting grooves (161) exert opposite forces in the X direction on the two adjusting parts.

11. The constant force tensioning device for the lifting box chain according to claim 10, characterized in that, The tensioning seat (150) has two support blocks (152) spaced apart along the X direction on the side of the base (110). The limiting seat (160) extends into the space between the two support blocks (152). The two ends of the second slide rail (153) are respectively connected to the two support blocks (152); and / or, the tensioning device (100) further includes a third slide rail, which is slidably connected to the tensioning seat (150) to guide the tensioning seat (150) to slide along the Y direction.

12. A lifting box, characterized in that, Includes a chain (200) and a tensioning device (100) as described in any one of claims 1 to 11.

13. A suspension device, characterized in that, Includes the lifting box as described in claim 12.

Images