A belt tensioning device and an apparatus having the same

Abstract

The present invention discloses a belt tensioning device and a device having the belt tensioning device, which include an oil cylinder, a rotating bracket mechanism, a screw mechanism and a braking mechanism; the first bushing in the rotating bracket mechanism is installed at both ends of the first spacer; one end of the mounting bracket is rotatably connected to the output end of the oil cylinder, and the other end is fixedly connected to one side of the first spacer; the other side of the first spacer is fixedly connected to one end of the first square tube, and the tensioning wheel is installed on the side of the other end of the first square tube; one end of the second square tube in the braking mechanism is fixedly connected to the bending bracket, the brake block is assembled on the bending bracket, the other end is fixedly connected to the second spacer, and the second bushing is assembled at both ends of the second spacer; one end of the screw mechanism is rotatably connected to the end of the first square tube close to the tensioning wheel, and the other end of the screw mechanism is rotatably connected to the end of the second square tube close to the bending bracket; the device has a simple structure, can simultaneously realize the tensioning of the belt and the braking of the driven pulley, and has high utilization efficiency.

Description

Technical Field

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

[0002] In the field of agricultural machinery, belt tensioning mechanisms are generally mechanically tensioned. The current belt tensioning mechanisms have complex mechanical structures and unstable tensioning states, are inconvenient to operate, and the tensioning springs are generally extension springs, with unstable spring tensioning forces, affecting the stable transmission of the belt. At the same time, when the machine is overhauled and maintained, the belt drive is cut off. Due to the action of inertia, the driven pulley will still rotate for a period of time, and there is no timely braking of the next-level transmission transmitted by the driven pulley, presenting a safety hazard.

[0003] For example, in patent CN213332253U, the tensioning pulley can rotate freely on the tensioning pulley frame through a bearing and a shaft sleeve, and the linkage of the tensioning handle, the tensioning pulley frame, the tensioning pulley, the support pin, the tensioning spring, the shock absorber and the transmission mechanism can be realized. The shock absorber can slow down the jumping of the tensioning pulley and ensure a stable tensioning state. However, it has the defects of complex structure and inability to simultaneously brake the driven pulley. Summary of the Invention

[0004] In view of the above problems, the first object of the present invention is to provide a belt tensioning device, which has a simple structure and is simple and convenient to operate; can simultaneously realize the tensioning of the belt and the braking of the driven pulley, with high utilization efficiency, prevent the action of inertia force, timely brake the next-level transmission transmitted by the driven pulley, avoid the danger of delayed braking, and ensure the safety of workers during machine overhaul and troubleshooting.

[0005] The second object of the present invention is to provide a device having the above belt tensioning device.

[0006] The first technical solution adopted by the present invention is: a belt tensioning device, comprising an oil cylinder 1, a rotating bracket mechanism 2, a screw mechanism 3 and a braking mechanism 4;

[0007] Wherein, the rotating bracket mechanism 2 includes a rotating bracket welded part 21, and the rotating bracket welded part 21 includes a first spacer 211, a mounting bracket 212, a first square tube 214 and a tensioning pulley 219; one end of the mounting bracket 212 is rotatably connected to the output end of the oil cylinder 1, and the other end is fixedly connected to one side of the first spacer 211; the other side of the first spacer 211 is fixedly connected to one end of the first square tube 214, and the tensioning pulley 219 is installed on the side of the other end of the first square tube 214;

[0008] The braking mechanism 4 includes a brake block 41, a bent bracket 42, and a second square tube 44; one end of the second square tube 44 is fixedly connected to the bent bracket 42, and the brake block 41 is assembled on the bent bracket 42;

[0009] One end of the screw mechanism 3 is rotatably connected to one end of the first square tube 214 close to the tension pulley 219, and the other end of the screw mechanism 3 is rotatably connected to one end of the second square tube 44 close to the bent bracket 42.

[0010] Preferably, the rotating bracket weldment 21 further includes a shaft 216. A second hole 215 is provided at the other end of the first square tube 214. One end of the shaft 216 passes through the second hole 215 and is fixed to the first square tube 214; the other end of the shaft 216 is sleeved with the tension pulley 219.

[0011] Preferably, the rotating bracket weldment 21 further includes a mounting block 217. The mounting block 217 is fixed to one end of the first square tube 214 close to the tension pulley 219; the mounting block 217 is rotatably connected to one end of the screw mechanism 3.

[0012] Preferably, one end of the mounting bracket 212 is provided with a first hole 213. The first hole 213 is rotatably connected to the output end of the oil cylinder 1 through a shaft pin and locked with an opening pin.

[0013] Preferably, the screw mechanism 3 includes a right-handed screw 31, an internal thread spacer sleeve 34, and a left-handed screw 36; one end of the internal thread spacer sleeve 34 is connected to one end of the right-handed screw 31, and the other end is connected to one end of the left-handed screw 36;

[0014] The other end of the left-handed screw 36 is rotatably connected to one end of the first square tube 214 close to the tension pulley 219, and the other end of the right-handed screw 31 is rotatably connected to one end of the second square tube 44 close to the bent bracket 42;

[0015] Or the other end of the right-handed screw 31 is rotatably connected to one end of the first square tube 214 close to the tension pulley 219, and the other end of the left-handed screw 36 is rotatably connected to one end of the second square tube 44 close to the bent bracket 42.

[0016] Preferably, the upper part of the internal thread spacer sleeve 34 is provided with a right-handed internal thread, and the lower part is provided with a left-handed internal thread; one end of the right-handed screw 31 is connected to the upper part of the internal thread spacer sleeve 34 through a right-handed nut 33; the lower part of the internal thread spacer sleeve 34 is connected to one end of the left-handed screw 36 through a left-handed nut 35.

[0017] Preferably, the rotary bracket welded part 21 further includes a mounting block 217, and the mounting block 217 is fixed to one end of the first square tube 214 close to the tensioning wheel 219; a third hole 218 is provided on the mounting block 217; a sixth hole 45 is provided at one end of the second square tube 44 close to the bending bracket 42; a fourth hole 32 is provided at the other end of the right-handed screw 31, and a fifth hole 37 is provided at the other end of the left-handed screw 36;

[0018] The fourth hole 32 is rotatably connected to the third hole 218 by a shaft pin, and the fifth hole 37 is rotatably connected to the sixth hole 45 by a shaft pin.

[0019] Preferably, the rotary bracket welded part 21 further includes a mounting block 217, and the mounting block 217 is fixed to one end of the first square tube 214 close to the tensioning wheel 219; a third hole 218 is provided on the mounting block 217; a sixth hole 45 is provided at one end of the second square tube 44 close to the bending bracket 42; a fourth hole 32 is provided at the other end of the right-handed screw 31, and a fifth hole 37 is provided at the other end of the left-handed screw 36;

[0020] The fifth hole 37 is rotatably connected to the third hole 218 by a shaft pin, and the fourth hole 32 is rotatably connected to the sixth hole (45) by a shaft pin.

[0021] Preferably, the braking mechanism 4 further includes a fixing block 43, and the brake block 41 is assembled between the bending bracket 42 and the fixing block 43.

[0022] The second technical solution adopted by the present invention is: a device with a belt tensioning device, including a frame, a frame fixed shaft, a fixing seat, and the belt tensioning device described in the first technical solution; the rotary bracket mechanism 2 further includes a first bushing 22, and the first bushings 22 are respectively installed at both ends of the first spacer 211; the braking mechanism 4 further includes a second spacer 47 and a second bushing 48; the other end of the second square tube 44 is fixedly connected to the second spacer 47, and the second bushings 48 are assembled at both ends of the second spacer 47;

[0023] One end of the oil cylinder 1 is installed on the fixing seat, the first bushing 22 is installed on the frame fixed shaft to axially position the rotary bracket welded part 21, the rotary bracket welded part 21 can rotate around the frame fixed shaft, and the second bushing 48 is installed on the frame fixed shaft and can rotate around the frame fixed shaft.

[0024] The beneficial effects of the above technical solutions:

[0025] (1) The present invention realizes the tensioning of the belt by the elongation of the oil cylinder and the relaxation of the belt by the retraction of the oil cylinder, having the advantages of stable belt tensioning and fast braking speed; at the same time, it can realize the braking of the driven pulley; that is, the belt tensioning and pulley braking device disclosed by the present invention can simultaneously realize the belt tensioning and the braking of the driven pulley, with high utilization efficiency.

[0026] (2) The belt tensioning device disclosed by the present invention can realize the braking of the driven pulley, prevent the action of inertial force, timely brake the next-stage transmission transmitted by the driven pulley, avoid the danger of delayed braking, and ensure the safety of workers for maintenance and inspection of the machine.

[0027] (3) The belt tensioning device disclosed by the present invention has a simple structure and is simple and convenient to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a schematic structural diagram of a belt tensioning device of the present invention;

[0029] Figure 2 is a schematic structural diagram of a rotating bracket mechanism provided by an embodiment of the present invention;

[0030] Figure 3 is a schematic structural diagram of a screw mechanism provided by an embodiment of the present invention;

[0031] Figure 4 is a schematic structural diagram of a braking mechanism provided by an embodiment of the present invention;

[0032] Figure 5 is a schematic structural diagram of a belt tensioned state provided by an embodiment of the present invention;

[0033] Figure 6 is a schematic structural diagram of a belt relaxed state and a pulley braking state provided by an embodiment of the present invention;

[0034] Wherein, 1 - oil cylinder; 2 - rotating bracket mechanism, 21 - rotating bracket welded part, 211 - first spacer, 212 - mounting bracket, 213 - first hole, 214 - first square tube, 215 - second hole, 216 - shaft, 217 - mounting block, 218 - third hole, 219 - tensioning wheel, 22 - first bushing; 3 - screw mechanism, 31 - right-handed screw, 32 - fourth hole, 33 - right-handed nut, 34 - internal thread spacer, 35 - left-handed nut, 36 - left-handed screw, 37 - fifth hole; 4 - braking mechanism, 41 - brake block, 42 - bending bracket, 43 - fixed block, 44 - second square tube, 45 - sixth hole, 46 - seventh hole, 47 - second spacer, 48 - second bushing. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0035] The present invention will be further described below through specific embodiments. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several variations and improvements can be made, which should also be regarded as falling within the protection scope of the present invention.

[0036] In the description of the present invention, it should be noted that unless otherwise specified, the meaning of "a plurality of" is two or more; the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance; for those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] Embodiment 1

[0038] As Figures 1-4 shown, a belt tensioning device provided by the present invention includes an oil cylinder 1, a rotating bracket mechanism 2, a screw mechanism 3, and a braking mechanism 4; the output end of the oil cylinder 1 is rotatably connected to the first holes 213 on two mounting brackets 212 in the rotating bracket mechanism 2 by a shaft pin and locked with an open pin; one end of the screw mechanism 3 is rotatably connected to the third hole 218 on the mounting block 217 in the rotating bracket mechanism 2 by a shaft pin and locked with an open pin; the other end of the screw mechanism 3 is rotatably connected to the sixth hole 45 on the second square tube 44 in the braking mechanism 4 by a shaft pin and locked with an open pin.

[0039] As Figure 2 shown, the rotating bracket mechanism 2 includes a rotating bracket welded part 21, and the rotating bracket welded part 21 includes a first spacer 211, mounting brackets 212, a first square tube 214, a shaft 216, a mounting block 217, and a tensioning wheel 219; one end of each of the two mounting brackets 212 is provided with a first hole 213, and the first hole 213 is rotatably connected to the output end of the oil cylinder 1 by a shaft pin and locked with an open pin; the other ends of the two mounting brackets 212 are welded in parallel to one side of the first spacer 211, one end of the first square tube 214 is welded to the other side of the first spacer 211, the other end of the first square tube 214 is provided with a second hole 215, one end of the shaft 216 passes through the second hole 215 on the first square tube 214 and is welded to the first square tube 214, the other end of the shaft 216 is provided with an internal thread, the tensioning wheel 219 is sleeved on the end of the shaft 216 provided with the internal thread and locked with a bolt at the end; the mounting block 217 is welded to one end of the first square tube 214 close to the shaft (or close to the tensioning wheel 219), and the mounting block 217 is provided with a third hole 218, and the third hole 218 is connected to one end of the screw mechanism 3.

[0040] As Figure 3As shown in the figure, the screw mechanism 3 includes a right-handed screw 31, a right-handed nut 33, an internal-thread spacer sleeve 34, a left-handed nut 35, and a left-handed screw 36; the upper part of the internal-thread spacer sleeve 34 is provided with a right-handed internal thread, and the lower part is provided with a left-handed internal thread; one end of the right-handed screw 31 is provided with a fourth hole 32, and the other end is connected to the upper part of the internal-thread spacer sleeve 34 through the right-handed nut 33; the lower part of the internal-thread spacer sleeve 34 is connected to one end of the left-handed screw 36 through the left-handed nut 35, and the other end of the left-handed screw 36 is provided with a fifth hole 37;

[0041] The fourth hole 32 on the right-handed screw 31 is rotatably connected to the third hole 218 on the mounting block 217 in the rotary support mechanism 2 by a shaft pin and locked with an open pin. The fifth hole 37 on the left-handed screw 36 is rotatably connected to the sixth hole 45 on the second square tube 44 in the braking mechanism 4 by a shaft pin and locked with an open pin; or the fifth hole 37 on the left-handed screw 36 is rotatably connected to the third hole 218 on the mounting block 217 in the rotary support mechanism 2 by a shaft pin and locked with an open pin, and the fourth hole 32 on the right-handed screw 31 is rotatably connected to the sixth hole 45 on the second square tube 44 in the braking mechanism 4 by a shaft pin and locked with an open pin. In the screw mechanism 3 of the present invention, the threaded connection is carried out by using an internal-thread spacer sleeve on two threaded rods with different helix directions, so that the screw mechanism 3 has a relaxation function and ensures the stability of the mechanism connection.

[0042] As Figure 4 shown, the braking mechanism 4 includes a brake block 41, a bent bracket 42, a fixed block 43, and a second square tube 44. One end of the second square tube is provided with a sixth hole 45. The bent bracket 42 is welded to the second square tube 44 near the sixth hole 45. The brake block 41 is assembled between the bent bracket 42 and the fixed block 43 by bolts. The material of the fixed block 43 is wear-resistant plastic.

[0043] In the present invention, the belt is tensioned by the elongation of the oil cylinder and relaxed by the retraction of the oil cylinder. It has the advantages of stable belt tensioning and fast braking speed; at the same time, it can realize the braking of the driven pulley; that is, the belt tensioning and pulley braking device disclosed in the present invention can simultaneously realize the belt tensioning and the braking of the driven pulley, with high utilization efficiency; moreover, the belt tensioning device disclosed in the present invention has a simple structure and is simple and convenient to operate.

[0044] The belt tensioning device disclosed in the present invention can realize the braking of the driven pulley, prevent the action of inertial force, timely brake the next-stage transmission transmitted by the driven pulley, avoid the danger of delayed braking, and ensure the safety of workers for maintenance and inspection of the machine.

[0045] Embodiment 2

[0046] As Figure 2 、 Figures 4-6As shown in the figure, a device with a belt tensioning device provided by the present invention includes a frame, a frame fixed shaft, a fixed seat, and the belt tensioning device described in Embodiment 1 above. The rotating bracket mechanism 2 further includes two first bushings 22, and the first bushings 22 are plastic bushings. The two first bushings 22 are respectively installed at both ends of the first spacer 211, and the outer ring of the first bushing 22 is in tight fit with the inner ring of the first spacer 211. The braking mechanism 4 further includes a second spacer 47 and two second bushings 48. A seventh hole 46 is provided at the other end of the second square tube. The second spacer 47 is welded at the seventh hole 46 of the second square tube 44. The two second bushings 48 are respectively assembled at both ends of the second spacer 47, and the outer side of the second bushing 48 is in tight fit with the inner side of the second spacer 47. Among them, the second bushing is a plastic bushing.

[0047] One end of the oil cylinder 1 in the belt tensioning device is installed on the fixed seat on the frame. The plastic first bushings 22 at both ends of the first spacer 211 in the rotating bracket mechanism 2 are installed on the frame fixed shaft, and the rotating bracket weldment 21 in the rotating bracket mechanism 2 is axially positioned by a locking sleeve. The rotating bracket weldment 21 in the rotating bracket mechanism 2 can rotate flexibly around the frame fixed shaft. The plastic second bushings 48 at both ends of the second spacer 47 in the braking mechanism 4 are installed on the frame fixed shaft and rotate flexibly around the frame fixed shaft.

[0048] As Figure 2 、 Figure 4 and Figure 5 shown, the belt tensioning state is as follows: the oil cylinder 1 extends upward by a certain distance. The first spacer 211 in the rotating bracket weldment 21 rotates around the frame fixed shaft on the frame. The tensioning wheel 219 rotates clockwise together with the rotating bracket weldment 21. At the same time, the other end of the screw mechanism 3 pushes the second spacer 47 in the braking mechanism 4 to rotate downward around the frame fixed shaft on the frame. At this time, the belt is tensioned, and the protruding groove on the brake block 41 does not contact the groove opening of the driven pulley, realizing the transmission of power.

[0049] As Figure 2 、 Figure 4 and Figure 6 shown, the belt slack state and the pulley braking state are as follows: the oil cylinder 1 contracts downward by a certain distance. The tensioning wheel 219 rotates counterclockwise together with the rotating bracket weldment 21. The tensioning wheel 219 disengages from the belt, cutting off the power transmission. At the same time, the other end of the screw mechanism 3 pushes the second spacer 47 in the braking mechanism 4 to rotate upward around the frame fixed shaft on the frame. The protruding groove on the brake block 41 contacts the groove opening on the driven pulley, realizing the rapid braking of the driven pulley, preventing the action of inertial force, timely braking the next-stage transmission transmitted by the driven pulley, avoiding the danger of delayed braking, and ensuring the safety of workers for machine maintenance and troubleshooting.

Claims

1. A belt tensioning device, characterized in that, It includes an oil cylinder (1), a rotating bracket mechanism (2), a screw mechanism (3) and a braking mechanism (4); Among them, the rotating bracket mechanism (2) includes a rotating bracket welded part (21), and the rotating bracket welded part (21) includes a first spacer sleeve (211), a mounting bracket (212), a first square tube (214) and a tension pulley (219); one end of the mounting bracket (212) is rotatably connected to the output end of the oil cylinder (1), and the other end is fixedly connected to one side of the first spacer sleeve (211); the other side of the first spacer sleeve (211) is fixedly connected to one end of the first square tube (214), and the tension pulley (219) is installed on the side of the other end of the first square tube (214); The braking mechanism (4) includes a brake block (41), a bent bracket (42) and a second square tube (44); one end of the second square tube (44) is fixedly connected to the bent bracket (42), and the brake block (41) is assembled on the bent bracket (42); One end of the screw mechanism (3) is rotatably connected to one end of the first square tube (214) close to the tension pulley (219), and the other end of the screw mechanism (3) is rotatably connected to one end of the second square tube (44) close to the bent bracket (42); The rotating bracket welded part (21) further includes a shaft (216) and a mounting block (217). The other end of the first square tube (214) is provided with a second hole (215). One end of the shaft (216) passes through the second hole (215) and is fixed on the first square tube (214); the other end of the shaft (216) sleevingly connects the tension pulley (219); the mounting block (217) is fixed to one end of the first square tube (214) close to the tension pulley (219); the mounting block (217) is rotatably connected to one end of the screw mechanism (3); The tension of the belt is achieved by the elongation of the oil cylinder, and the relaxation of the belt and the braking of the driven pulley are achieved by the retraction of the oil cylinder.

2. The belt tensioning device according to claim 1, characterized in that, One end of the mounting bracket (212) is provided with a first hole (213), and the first hole (213) is rotatably connected to the output end of the oil cylinder (1) through a shaft pin and locked with an open pin.

3. A belt tensioning device according to claim 1, characterized in that, The screw mechanism (3) includes a right-handed screw (31), an internal thread spacer sleeve (34) and a left-handed screw (36); one end of the internal thread spacer sleeve (34) is connected to one end of the right-handed screw (31), and the other end is connected to one end of the left-handed screw (36); The other end of the left-handed screw (36) is rotatably connected to one end of the first square tube (214) close to the tension pulley (219), and the other end of the right-handed screw (31) is rotatably connected to one end of the second square tube (44) close to the bent bracket (42); Or the other end of the right-handed screw (31) is rotatably connected to one end of the first square tube (214) close to the tension pulley (219), and the other end of the left-handed screw (36) is rotatably connected to one end of the second square tube (44) close to the bent bracket (42).

4. A belt tensioning device according to claim 3, characterized in that, The upper part of the internal thread spacer sleeve (34) is provided with a right-handed internal thread, and the lower part is provided with a left-handed internal thread; one end of the right-handed screw rod (31) is connected to the upper part of the internal thread spacer sleeve (34) through a right-handed nut (33); the lower part of the internal thread spacer sleeve (34) is connected to one end of the left-handed screw rod (36) through a left-handed nut (35).

5. A belt tensioning device according to claim 3, characterized in that, The mounting block (217) is fixed to one end of the first square tube (214) close to the tensioning wheel (219); a third hole (218) is provided on the mounting block (217); a sixth hole (45) is provided at one end of the second square tube (44) close to the bending bracket (42); a fourth hole (32) is provided at the other end of the right-handed screw rod (31), and a fifth hole (37) is provided at the other end of the left-handed screw rod (36); The fourth hole (32) is rotationally connected to the third hole (218) through a shaft pin, and the fifth hole (37) is rotationally connected to the sixth hole (45) through a shaft pin.

6. A belt tensioning device according to claim 3, wherein, The mounting block (217) is fixed to one end of the first square tube (214) close to the tensioning wheel (219); a third hole (218) is provided on the mounting block (217); a sixth hole (45) is provided at one end of the second square tube (44) close to the bending bracket (42); a fourth hole (32) is provided at the other end of the right-handed screw rod (31), and a fifth hole (37) is provided at the other end of the left-handed screw rod (36); The fifth hole (37) is rotationally connected to the third hole (218) through a shaft pin, and the fourth hole (32) is rotationally connected to the sixth hole (45) through a shaft pin.

7. A belt tensioning device according to claim 1, characterized in that, The braking mechanism (4) further includes a fixed block (43), and the brake block (41) is assembled between the bending bracket (42) and the fixed block (43).

8. An apparatus with a belt tensioning device, characterized in that, It includes a frame, a frame fixed shaft, a fixed seat and the belt tensioning device according to any one of claims 1-7; the rotary bracket mechanism (2) further includes a first bushing (22), and the first bushings (22) are respectively installed at both ends of the first spacer sleeve (211); the braking mechanism (4) further includes a second spacer sleeve (47) and a second bushing (48); the other end of the second square tube (44) is fixedly connected to the second spacer sleeve (47), and the second bushings (48) are assembled at both ends of the second spacer sleeve (47); One end of the oil cylinder (1) is installed on the fixed seat, the first bushing (22) is installed on the frame fixed shaft to axially position the rotary bracket weldment (21), the rotary bracket weldment (21) can rotate around the frame fixed shaft, the second bushing (48) is installed on the frame fixed shaft and can rotate around the frame fixed shaft.

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