A flexible chain tensioning device

Abstract

The present invention discloses a flexible chain tensioning device, which includes two symmetrically arranged rocker arm assemblies, a spring assembly and a mounting base plate. The rocker arm assembly includes a tensioning sprocket, a sprocket shaft and a rocker arm. The tensioning sprocket is rotationally assembled at the top end of the rocker arm through the sprocket shaft, the bottom end of the rocker arm is hinged to the mounting base plate, and the spring assembly is horizontally assembled between the two rocker arms. The chain tensioning device of the present application performs flexible tensioning on the chain, has functions of automatic compensation and self-adjusting tensioning, reduces the potential safety hazards of chain skipping and chain derailment during the chain transmission process, and improves the working efficiency of the chain tensioning operation at the same time.

Description

Technical Field

[0001] The present invention relates to the technical field of chain tensioning, and particularly relates to a flexible chain tensioning device. Background Art

[0002] Sprockets and chains are two major components of a sprocket drive system. In order to achieve the required tension degree of the chain under working conditions, generally, a chain tensioning device is designed and arranged in the sprocket drive system. The existing chain tensioning devices in the prior art generally do not have an automatic compensation function and cannot achieve flexible tensioning. That is to say, due to the characteristics of chain drive, after long-term power transmission, the chain is prone to elongation and slack. Excessive slack needs to be tensioned in a timely manner. For a chain tensioning device without a compensation function, it is necessary to manually adjust the chain tensioning device. In a workplace with a high chain tension degree, this seriously affects production efficiency and is not conducive to realizing industrial automated production. In some special cases, reliable chain tensioning and anti-loosening methods are required to achieve transmission. Especially when the sprocket is driven horizontally, due to the inherent characteristic that the chain will become slack after long-term operation, under the action of its gravity, tooth skipping or even chain derailment will occur, posing a safety hazard and seriously affecting work efficiency. Therefore, how to design and develop a more efficient chain tensioning device is a topic worthy of key attention in the sprocket drive system. Summary of the Invention

[0003] In view of this, the purpose of the present invention is to provide a flexible chain tensioning device, which has automatic compensation and self-adjusting tensioning functions, so as to reduce the safety hazard during the chain drive process and improve the work efficiency of the chain tensioning operation at the same time.

[0004] The present invention solves the above problems through the following technical means:

[0005] A flexible chain tensioning device includes two symmetrically arranged rocker arm assemblies, a spring assembly, and a mounting base plate. The rocker arm assembly includes a tensioning sprocket, a sprocket shaft, and a rocker arm. The tensioning sprocket is rotationally assembled at the top of the rocker arm through the sprocket shaft, and the bottom end of the rocker arm is hinged to the mounting base plate. The spring assembly is horizontally assembled between the two rocker arms.

[0006] Further, both ends of the spring assembly are respectively hinged to the corresponding rocker arm through fastening pins.

[0007] Further, the spring assembly includes a spring structure, an adjusting screw, a fastening nut, and a rotary connecting block. The spring structure includes spring base plates at both ends and a spring in the middle. The nut end of the adjusting screw is rotationally assembled with the spring base plate, and the threaded section is matched and assembled with a threaded hole opened in the center of the rotary connecting block, and a fastening nut is provided at the end. Circular holes for rotational cooperation with the fastening pins are opened on the front and rear sides of the rotary connecting block.

[0008] Furthermore, two hinge seats are welded on the mounting base plate, and the bottom ends of the two rocker arms are respectively hinged to the two hinge seats through pin shafts.

[0009] Furthermore, four waist-shaped mounting holes are provided at the four corners of the mounting base plate.

[0010] Furthermore, a T-shaped shaft body is integrally provided at the nut end of the adjusting screw, and the T-shaped shaft body is assembled in a matching manner with a T-shaped hole provided on the spring base plate.

[0011] Advantages of the present invention:

[0012] 1), This tensioning device is applicable to both vertical and horizontal chain drive structures;

[0013] 2), This tensioning device performs flexible tensioning on the chain, can achieve compensation in a timely manner, is not affected by special conditions such as external vibration and swing, keeps the chain in a tensioned state all the time, can realize flexible tensioning of the chain, and can prevent the sprocket from derailing. It not only reduces the safety hazards during the chain drive process, but also improves the working efficiency of the chain tensioning operation;

[0014] 3), When the chain drive is a horizontal drive with a relatively large distance between two sprockets, this tensioning device can be arranged near the sprocket position to prevent derailing caused by the self-weight of the chain or external factors;

[0015] 4), Adopting the double tensioning sprocket tensioning method, with the same tensioning force, the tensioning amplitude can be reduced. Description of the drawings

[0016] The present invention will be further described below in conjunction with the drawings and embodiments.

[0017] Figure 1 It is a schematic structural diagram of a preferred embodiment of the flexible chain tensioning device of the present invention;

[0018] Figure 2 It is a schematic structural diagram of the rocker arm assembly;

[0019] Figure 3 It is a schematic structural diagram of the spring assembly;

[0020] Figure 4 It is a schematic structural diagram of the spring structure;

[0021] Figure 5 It is a schematic structural diagram of the fastening pin;

[0022] Figure 6 It is a schematic structural diagram of the rotary connecting block;

[0023] Figure 7 It is a schematic structural diagram of the adjusting screw;

[0024] Figure 8Schematic diagram of the application of the flexible chain tensioning device of the present invention. Detailed implementation mode

[0025] The present invention will be described in detail below in conjunction with the drawings and embodiments.

[0026] As Figure 1-2 shown, this embodiment discloses a flexible chain tensioning device, which includes two symmetrically arranged swing arm assemblies 1, a spring assembly 2, a mounting base plate 3 and a fastening pin 4;

[0027] As Figure 2 shown, the swing arm assembly 1 includes a tensioning sprocket 5, a sprocket shaft 6 and a swing arm rod 7; the tensioning sprocket 5 is rotationally assembled at the top of the swing arm rod 7 through the sprocket shaft 6, and the bottom end of the swing arm rod 7 is hinged to the mounting base plate 3. Specifically, a hinge seat 15 is fixedly arranged on the mounting base plate 3, and the swing arm rod 7 is hinged to the hinge seat 15 through a pin shaft. A rectangular smooth groove is opened in the middle of the swing arm rod, through holes are symmetrically opened on both sides of the rectangular smooth groove, and two screw holes are designed on the upper and lower sides of the through holes respectively.

[0028] As Figure 3 shown, the elastic component 2 includes a spring structure 11, an adjusting screw 10, a fastening nut 8 and a rotary connecting block 9. As Figure 4 shown, the spring structure 11 includes spring base plates 12 at both ends and a spring 13 in the middle. The nut end of the adjusting screw 10 is rotationally matched with the spring base plate 12, and there is no axial looseness between the adjusting screw 10 and the spring base plate 12. A preferably designed method is: as Figure 7 shown, a T-shaped shaft body 1001 is fixedly arranged at the top of the adjusting screw, and the T-shaped shaft body is assembled with the T-shaped hole on the spring base plate.

[0029] As Figure 6 shown, the rotary connecting block 9 is in the shape of a cylinder with two smooth side surfaces symmetrically machined on the cylindrical surface. Two smooth round holes 901 are symmetrically designed in the middle of the smooth surfaces on both sides. At the same time, a threaded hole 902 penetrating the upper and lower surfaces is opened in the rotary connecting block. The threaded section of the adjusting screw is matched and connected with the threaded hole 902 of the rotary connecting block 9, and the position of the adjusting screw and the rotary connecting block is fixed through the fastening nut 8 to prevent loosening caused by long-term work.

[0030] Four waist-shaped mounting holes 14 are opened at the four corners of the mounting base plate 3 to facilitate adjustment of the mounting position of the mounting base plate 3; the two hinge seats 15 are symmetrically welded on the base plate.

[0031] As Figure 5As shown, the fastening pin 4 includes an integrally formed fixed base plate 401, an intermediate column 402 and a head column 403. The head column is clearance-matched with the smooth circular hole on the side of the rotating connecting block, and the rotating connecting block can rotate around the axis of the head column; the intermediate column is transitionally matched with the circular holes on both sides of the swing arm rod, and the fixed base plate is fixed to the screw holes on the swing arm rod by screws.

[0032] The flexible tensioning device of this application comprises two symmetrically arranged swing arm assemblies 1, each hinged to two hinged seats on a mounting base 3. Rotating connection blocks 9 at each end of the elastic assembly 2 are hinged to the swing arm rods 7 via fastening pins 4. The tensioning sprocket 5 is stressed, causing the two swing arm rods to swing outward about the hinged seats. This increases the angle between the two swing arm rods, stretching the spring. As the tension increases, the tensioning device enters a tensioning equilibrium, achieving the desired tensioning effect.

[0033] Implementation method: Before pre-installing the flexible chain tensioning device, adjust the adjustment screw so that the two swing arms are at the maximum angle when not under stress, and ensure that the pre-assembly angle of the two swing arms is greater than 100°, so as to increase the tension compensation amount. At this time, the spring is in an unstressed state. The mounting base and the preset mounting frame (not described) are fixed by fixing bolts passing through the waist-shaped mounting holes 14. The waist-shaped mounting hole design allows for fine-tuning of the mounting position. Apply outward pulling force to the two swing arms to increase the angle between the two swing arms. At this time, the spring is in a stretched state, and the tensioning sprocket at the end of the swing arm cooperates with the chain to be tensioned, and the external force is removed. Figure 8 As shown, during the tensioning process, the two swing arms are subjected to the two tensioning sprocket forces F 张紧 , the direction is vertical and the chain is downward. At this time, the spring generates a pulling force F on the swing arm. 弹力 The articulated seat generates a supporting force F on the swing arm 支撑力 , when F 张紧 +F 弹力 +F 支撑力 =0, the entire flexible tensioning device is in a force balance state, thus achieving flexible, self-adjusting, self-adaptive, and automatic compensation tensioning of the chain, greatly improving work efficiency and production efficiency.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A flexible chain tensioning device, characterized in that: It includes two symmetrically arranged rocker arm assemblies (1), spring assemblies (2) and mounting base plates (3). The rocker arm assemblies include tension sprockets (5), sprocket shafts (6) and rocker arms (7). The tension sprockets are rotationally assembled at the top ends of the rocker arms through the sprocket shafts. The bottom ends of the rocker arms are hinged to the mounting base plates. The spring assemblies are horizontally assembled between the two rocker arms; Both ends of the spring assembly are respectively hinged to the rocker arms at the corresponding ends through fastening pins (4); The spring assembly includes a spring structure (11), adjusting screws (10), fastening nuts and rotating connection blocks (9). The spring structure includes spring base plates (12) at both ends and a spring (13) in the middle. The nut ends of the adjusting screws are rotationally assembled with the spring base plates, and the threaded sections are matched and assembled with threaded holes opened in the centers of the rotating connection blocks, and fastening nuts (8) are provided at the ends. Circular holes for rotational cooperation with the fastening pins are opened on the front and rear sides of the rotating connection blocks; Implementation method: Before pre-installation, adjust the adjusting screw to make the two swing arm rods at the maximum included angle in the unloaded state, ensure that the pre-assembly angle of the two swing arm rods is greater than 100°, and at this time the spring is in the unloaded state; apply an outward pulling force to the two swing arm rods to increase the included angle between the two swing arm rods. At this time, the spring is in a stretched state, and the tensioning sprocket at the end of the swing arm rod cooperates with the chain to be tensioned. Remove the external force. During the tensioning process, the two swing arm rods are subjected to the force F of the two tensioning sprockets 张紧 , the direction is perpendicular to the chain downward. At this time, the spring generates a pulling force F on the swing arm rod 弹力 , and the hinge seat generates a supporting force F on the swing arm rod 支撑力 . When F 张紧 +F 弹力 +F 支撑力 =0, the entire flexible tensioning device is in a force balance state; Two hinge seats (15) are welded on the mounting base plate. The bottom ends of the two rocker arms are respectively hinged to the two hinge seats through pin shafts; The two hinge seats are symmetrically welded on the base plate.

2. The flexible chain tensioning device according to claim 1, characterized in that: Four waist-shaped mounting holes (14) are opened at the four corners of the mounting base plate.

3. The flexible chain tensioning device according to claim 2, wherein: A T-shaped shaft body (1001) is integrally provided at the nut end of the adjusting screw, and the T-shaped shaft body is matched and assembled with a T-shaped hole opened in the spring base plate.

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