Chain tensioning device for frame lifting

Abstract

A chain tensioning device for frame lifting relates to the technical field of tensioning devices and comprises a frame connector, a chain and a tensioning mechanism, and the chain is correspondingly and adjustably connected with the frame connector through the tensioning mechanism. The tensioning mechanism comprises a U-shaped connecting plate, a connecting seat and an adjusting bolt; a U-shaped connecting plate is arranged at the top of the body of the connecting seat, two ends of the U-shaped connecting plate are correspondingly fastened and connected with the connecting seat through bolts, and the chain is correspondingly connected with the closed end of the U-shaped connecting plate; an open hole is formed in the position, corresponding to the position between the two ends of the U-shaped connecting plate, of the connecting seat body, and the stud end of the adjusting bolt penetrates out of the open hole and then is in corresponding threaded connection with the frame connector; the purpose of adjusting the tightness of the chain can be achieved by screwing the adjusting bolt, and adjustment is convenient and fast.

Description

Technical Field

[0001] The utility model relates to the technical field of tensioning devices, in particular to a chain tensioning device for frame lifting. Background Art

[0002] At present, a certain type of frame lifting device uses a motor to drive a reducer, which is then transmitted to a sprocket, and the frame is lifted through the sprocket and chain; during assembly, it is necessary to adjust the tightness of the chain. After the chain is used for a period of time, it elongates. During lifting, due to insufficient chain tension, the parts are lifted unstably. Therefore, it is also necessary to regularly adjust the tightness of the chain during use; combined with the attached Figure 4 , the existing chain is connected to the frame through a connector. The chain is hinged to the connector through a chain pin, and the connector is threadedly connected to the frame joint of the frame through a stud; the method for adjusting the chain tension is as follows: loosen the elastic lock piece of the chain, remove the chain plate, remove the connecting pin, and adjust the connection length between the connector and the frame joint to achieve the purpose of adjusting the chain tightness; although the existing connection structure is simple, the operation of adjusting the chain tightness requires repeated operations many times to determine the final length of the connection between the connector and the frame joint. This method has the disadvantages of difficult adjustment, complex operation, and low adjustment efficiency in actual use; the above defects are problems that need to be solved urgently by those skilled in the art. Summary of the Utility Model

[0003] In order to overcome the deficiencies in the background art, the utility model discloses a chain tensioning device for frame lifting.

[0004] To achieve the above invention purpose, the utility model adopts the following technical solutions:

[0005] A chain tensioning device for frame lifting, comprising a frame joint and a chain, and further comprising a tensioning mechanism. The chain is adjustably connected to the frame joint through the tensioning mechanism; the tensioning mechanism comprises a U-shaped connecting plate, a connecting seat, and an adjusting bolt; a U-shaped connecting plate is provided at the top of the body of the connecting seat, and the two ends of the U-shaped connecting plate are fixedly connected to the connecting seat through bolts. The chain is connected to the closed end of the U-shaped connecting plate correspondingly; an opening is provided at the position of the body of the connecting seat corresponding to the two ends of the U-shaped connecting plate, and the stud end of the adjusting bolt passes through the opening and is threadedly connected to the frame joint correspondingly.

[0006] Preferably, a reinforcing plate is provided at the position of the frame joint corresponding to the adjusting bolt.

[0007] Preferably, a locking nut is threadedly connected to the stud body of the adjusting bolt.

[0008] Preferably, a spring is sleeved on the stud body of the adjusting bolt corresponding to the position between the connecting seat and the frame joint.

[0009] Preferably, a plum blossom handwheel is installed at the screw head end of the adjusting bolt.

[0010] Preferably, the chain is correspondingly connected to the closed end of the U-shaped connecting plate through a pin.

[0011] Due to the adoption of the above-mentioned technical solution, the utility model has the following beneficial effects:

[0012] A chain tensioning device for frame lifting disclosed by the utility model has a simple structure, is easy to assemble, has a low production cost, and the chain is adjustably connected to the frame joint through a tensioning mechanism; when the chain is too long, the adjusting bolt can be screwed by a wrench, and the distance between the connecting seat and the frame joint can be shortened to tighten the chain, so as to achieve the purpose of adjusting the tightness of the chain; on the contrary, when the chain is too tight, the adjusting bolt can be screwed in the reverse direction, thereby achieving the purpose of loosening the chain, and the adjustment is convenient and fast; a plum blossom handwheel is installed at the screw head end of the adjusting bolt, that is, the adjusting bolt can be screwed through the plum blossom handwheel, and there is no need to screw the adjusting bolt through a wrench, further improving the convenience of adjusting the tightness of the chain; a spring is sleeved on the screw column body of the adjusting bolt corresponding to the connecting seat and the frame joint, that is, the spring can apply an elastic force to the connecting seat to prevent the connecting seat from moving up and down on the screw column of the adjusting bolt when the chain is too loose, and damaging the thread of the adjusting bolt. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a schematic structural diagram of the utility model;

[0014] Figure 2 is a schematic structural diagram of the tensioning mechanism;

[0015] Figure 3 is a schematic installation structure diagram of the plum blossom handwheel;

[0016] Figure 4 is a schematic connection structure diagram of the existing chain.

[0017] In the figure: 1, frame joint; 2, chain; 3, tensioning mechanism; 3-1, U-shaped connecting plate; 3-2, connecting seat; 3-3, adjusting bolt; 3-4, bolt; 3-5, locking nut; 3-6, spring; 3-7, plum blossom handwheel; 4, pin; 5, reinforcing plate. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] The present utility model can be explained in detail through the following embodiments. The purpose of disclosing the present utility model is to protect all technical improvements within the scope of the present utility model. In the description of the present utility model, it should be understood that if there are terms such as "upper", "lower", "front", "rear", "left", "right", etc. indicating the orientation or position relationship, it is only corresponding to the drawings of the present application. For the convenience of describing the present utility model, it does not indicate or imply that the device or component referred to must have a specific orientation.

[0019] Embodiment 1, in combination with the attached Figures 1-2 , a chain tensioning device for frame lifting, comprising a frame joint 1 and a chain 2. When in use, the frame joint 1 is fixedly connected to the frame correspondingly, and the frame joint 1 is pulled by the chain 2 to achieve the purpose of lifting the frame; it further comprises a tensioning mechanism 3, and the chain 2 is adjustably connected to the frame joint 1 through the tensioning mechanism 3, that is, the tightness of the chain 2 is adjusted through the tensioning mechanism 3 during use;

[0020] In combination with the attached Figure 2 , the tensioning mechanism 3 comprises a U-shaped connecting plate 3-1, a connecting seat 3-2 and an adjusting bolt 3-3; a U-shaped connecting plate 3-1 is provided at the top of the body of the connecting seat 3-2, and the two ends of the U-shaped connecting plate 3-1 are fixedly connected to the connecting seat 3-2 correspondingly through bolts 3-4, and the chain 2 is connected to the closed end of the U-shaped connecting plate 3-1 correspondingly; as required, the chain 2 is connected to the closed end of the U-shaped connecting plate 3-1 through a pin 4, that is, a pin hole can be opened at the closed end of the U-shaped connecting plate 3-1, and the pin 4 is passed through the pin hole and the link at the connecting end of the chain 2, and the connection operation of the chain 2 and the U-shaped connecting plate 3-1 can be realized, with simple structure and convenient and fast operation;

[0021] An opening is provided at the position corresponding to the two ends of the U-shaped connecting plate 3-1 on the body of the connecting seat 3-2, and the stud end of the adjusting bolt 3-3 passes through the opening and is threadedly connected to the frame joint 1 correspondingly; when the chain 2 is too long, the adjusting bolt 3-3 can be screwed by a wrench to shorten the distance between the connecting seat 3-2 and the frame joint 1 to tighten the chain 2, so as to achieve the purpose of adjusting the tightness of the chain 2; on the contrary, when the chain 2 is too tight, the adjusting bolt 3-3 can be screwed in the reverse direction to loosen the chain 2, and the adjustment is convenient and fast;

[0022] It should be noted that when assembling the tensioning mechanism 3, the adjusting bolt 3-3 needs to pass through the opening of the connecting seat 3-2 first, and then the two ends of the U-shaped connecting plate 3-1 are fixedly connected to the connecting seat 3-2 through bolts 3-4; when in use, the chain 2 and the adjusting bolt 3-3 need to be on a vertical straight line to prevent a large bending moment from being applied to the adjusting bolt 3-3, resulting in the bending of the adjusting bolt 3-3 and making it difficult to flexibly adjust the tightness of the chain 2.

[0023] In Embodiment 2, it is found during actual use that the screw head of the adjusting bolt 3-3 is located in the narrow space of the U-shaped connecting plate 3-1, and it is not convenient to operate when screwing the adjusting bolt 3-3 with a wrench.

[0024] Combined with the attached Figure 3 , a chain tensioning device for frame lifting, which is different from Embodiment 1 in that on the basis of Embodiment 1, a plum blossom handwheel 3-7 is installed at the screw head end of the adjusting bolt 3-3, that is, the adjusting bolt 3-3 can be screwed by the plum blossom handwheel 3-7, and there is no need to screw the adjusting bolt 3-3 with a wrench anymore, further improving the convenience of adjusting the tightness of the chain 2.

[0025] Embodiment 3, combined with the attached Figure 3 , a chain tensioning device for frame lifting, on the basis of Embodiment 1 or 2, a spring 3-6 is sleeved on the stud body of the adjusting bolt 3-3 corresponding to the connecting seat 3-2 and the frame joint 1, that is, the spring 3-6 can apply an elastic force to the connecting seat 3-2 to prevent the connecting seat 3-2 from moving up and down on the stud body of the adjusting bolt 3-3 when the chain 2 is too loose, and damaging the thread of the adjusting bolt 3-3.

[0026] Embodiment 4, combined with the attached Figure 3 , a chain tensioning device for frame lifting, on the basis of any one of Embodiments 1 to 3, a reinforcing plate 5 is provided at the position of the frame joint 1 corresponding to the adjusting bolt 3-3, which can effectively improve the structural strength of the connection between the frame joint 1 and the adjusting bolt 3-3; a locking nut 3-5 is threadedly connected to the stud body of the adjusting bolt 3-3, and when the tightness of the chain 2 is adjusted, the locking nut 3-5 can be screwed so that the locking nut 3-5 abuts against the frame joint 1 or the reinforcing plate 5 correspondingly, thereby locking the adjusting bolt 3-3 to prevent the adjusting bolt 3-3 from loosening accidentally.

[0027] The parts not detailed in the present utility model are prior art. For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model; therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting, and all changes falling within the meaning and scope of the equivalent elements are intended to be included in the present utility model.

Claims

1. A chain tensioning device for frame lifting, comprising a frame joint (1) and a chain (2), characterized in that: It further includes a tensioning mechanism (3), and the chain (2) is adjustably connected to the frame joint (1) correspondingly through the tensioning mechanism (3); the tensioning mechanism (3) includes a U-shaped connecting plate (3-1), a connecting seat (3-2) and an adjusting bolt (3-3); a U-shaped connecting plate (3-1) is provided at the top of the body of the connecting seat (3-2), and the two ends of the U-shaped connecting plate (3-1) are fixedly connected to the connecting seat (3-2) correspondingly through bolts (3-4), and the chain (2) is connected to the closed end of the U-shaped connecting plate (3-1) correspondingly; an opening is provided at the position of the body of the connecting seat (3-2) corresponding to the two ends of the U-shaped connecting plate (3-1), and the stud end of the adjusting bolt (3-3) passes through the opening and is threadedly connected to the frame joint (1) correspondingly.

2. The chain tensioning device for frame lifting according to claim 1, characterized in that: A reinforcing plate (5) is provided at the position of the frame joint (1) corresponding to the adjusting bolt (3-3).

3. The chain tensioning device for frame lifting according to claim 1, characterized in that: A locking nut (3-5) is threadedly connected to the stud body of the adjusting bolt (3-3).

4. The chain tensioning device for frame lifting according to claim 1, characterized in that: A spring (3-6) is sleeved on the stud body of the adjusting bolt (3-3) corresponding to the position between the connecting seat (3-2) and the frame joint (1).

5. The chain tensioning device for frame lifting according to claim 1, characterized in that: A plum blossom handwheel (3-7) is installed at the stud head end of the adjusting bolt (3-3).

6. The chain tensioning device for frame lifting according to claim 1, characterized in that: The chain (2) is connected to the closed end of the U-shaped connecting plate (3-1) correspondingly through a pin (4).

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