Circulating belt tensioning device and quick freezer using the same

Abstract

The application provides a circulating belt tensioning device and a quick freezer using the same. The circulating belt tensioning device comprises a support, a pair of upper rollers rotatably and spacedly arranged on the upper part of the support, a pair of lower rollers rotatably and spacedly arranged on the lower part of the support, a guide structure arranged on the support and extending between the upper rollers and the lower rollers, a movable rod movably arranged on the guide structure, a circulating belt comprising a head-to-tail connected upper conveyor belt and a lower conveyor belt, the upper conveyor belt abutting against the top end of the support, and the lower conveyor belt being arranged around the pair of lower rollers, the pair of upper rollers and the movable rod, a sensing device arranged on the top end of the support and used for sensing the displacement of the upper conveyor belt descending relative to the top end of the support, and a driving device used for driving the movable rod to reciprocatingly and vertically move along the guide structure between the upper rollers and the lower rollers according to the displacement, so as to adjust the tensioning force of the circulating belt when the upper conveyor belt is slack and sagging. The circulating belt tensioning device adjusts the pre-tensioning force according to the running state of the conveyor belt, so that the tension of each point of the circulating belt is kept uniform.

Description

Technical Field

[0001] This invention relates to the field of freezing technology, and in particular to a circulating belt tensioning device and a quick-freezing machine using the same. Background Technology

[0002] In traditional spiral freezers, the upper part of the conveyor belt tends to sag and droop due to the weight of the frozen goods during installation or after a certain period of operation. This affects the overall transmission and operation of the conveyor belt, as well as the stability of transporting the frozen goods. To address this, existing technologies typically add a tensioning mechanism to the spiral freezer. However, conventional tensioning mechanisms cannot flexibly adjust their tension according to the conveyor belt's operating state. This results in an inability to adapt the tension to varying loads of frozen goods, leading to a mismatch between the conveyor belt's operating state and the tensioning mechanism's pre-tension. Consequently, uneven tension occurs at different points on the conveyor belt, increasing the failure rate of the spiral freezer and reducing its operational stability, reliability, and efficiency. Summary of the Invention

[0003] This invention proposes a circulating belt tensioning device and a quick-freezing machine using the same, in order to solve the technical problem that the tensioning mechanism of the spiral quick-freezing machine in the prior art cannot adjust the tension of the conveyor belt according to the running state of the conveyor belt.

[0004] To solve the above problems, the technical solution adopted by the present invention is as follows:

[0005] This invention provides a recirculating belt tensioning device, comprising:

[0006] A bracket; a pair of upper rollers, rotatably and spaced apart on the upper part of the bracket; a pair of lower rollers, rotatably and spaced apart on the lower part of the bracket;

[0007] A guide structure is provided on the bracket and extends between the upper roller and the lower roller;

[0008] The movable rod is movably mounted on the guide structure;

[0009] The circulating belt includes an upper conveyor belt and a lower conveyor belt that are connected end to end. The upper conveyor belt abuts against the top of the support, and the lower conveyor belt is wound around a pair of lower rollers, a pair of upper rollers and a movable rod.

[0010] A sensing device, located at the top of the support, is used to sense the displacement of the upper conveyor belt relative to the top of the support as it descends.

[0011] A drive unit is used to drive a movable rod to reciprocate up and down between the upper and lower rollers along the guide structure according to the displacement magnitude, so as to adjust the tension of the circulating belt when the upper conveyor belt sags.

[0012] Preferably, the support includes:

[0013] roof;

[0014] A pair of vertical panels are arranged at relative intervals and respectively connected to both sides of the top panel;

[0015] Two pairs of upper support arms are respectively located at opposite ends of the upper part of the vertical plate, and a pair of upper rollers are respectively rotatably installed between the two pairs of upper support arms;

[0016] Two pairs of lower support arms are respectively located at opposite ends of the lower part of the vertical plate, and a pair of lower rollers are respectively rotatably installed between the two pairs of lower support arms;

[0017] A pair of guide structures are respectively arranged in parallel on a pair of vertical plates, and a movable rod is movably installed between the pair of guide structures.

[0018] Preferably, the guide structure is a strip-shaped through hole, and the movable rod is movably inserted into a pair of strip-shaped through holes;

[0019] The drive unit includes:

[0020] The drive unit is mounted on the vertical plate; the connector connects the drive unit and the movable rod.

[0021] The drive unit drives the movable rod to reciprocate between the upper and lower rollers via the drive connector.

[0022] Preferably, the drive unit is an electro-hydraulic actuator, the axis of which is perpendicular to the axis of the movable rod, and the connecting member is an L-shaped angle plate fixedly connected between the output actuator and the movable rod of the electro-hydraulic actuator.

[0023] Furthermore, the stent also includes:

[0024] Two pairs of upper bearings are respectively located on the opposite inner sides of two pairs of upper support arms; one pair of upper rotating shafts are respectively rotatably installed between the two pairs of upper bearings; one pair of upper rollers are respectively sleeved on the pair of upper rotating shafts.

[0025] Two pairs of lower bearings are respectively located on the opposite inner sides of the two pairs of lower support arms; a pair of lower rotating shafts are respectively rotatably installed between the two pairs of lower bearings; a pair of lower rollers are respectively sleeved on the pair of lower rotating shafts.

[0026] Preferably, the sensing device includes:

[0027] Displacement sensor, located at the top of the bracket;

[0028] A signal sensing element is mounted on the displacement sensor.

[0029] Preferably, the tension force F and the displacement X satisfy: F = KX, where K is a constant determined by the material of the cyclic belt tensioning device;

[0030] The distance S of the reciprocating lifting motion of the movable rod satisfies: S = aX + b, where a and b are system constants.

[0031] The present invention also provides a quick-freezing machine, including the above-mentioned circulating belt tensioning device.

[0032] Furthermore, the quick-freezing machine is a spiral quick-freezing machine, which includes:

[0033] The machine casing; the inlet and outlet are respectively located at opposite ends of the machine casing;

[0034] A pair of rotating cylinders are respectively located at opposite ends inside the casing;

[0035] A pair of rotating devices, each used to drive a pair of rotating cages to rotate;

[0036] The evaporator is located between a pair of rotating drums;

[0037] The circulating belt tensioning device is located between a pair of rotating drums and on one side of the evaporator;

[0038] The upper conveyor belt is wound around the feed inlet, a pair of rotating drums and the discharge outlet, while the lower conveyor belt is wound around the discharge outlet, a pair of lower rollers, a pair of upper rollers, the movable rod and the feed inlet.

[0039] Preferably, the circulating belt is a mesh belt, and the rotating cage is provided with a support guide rail that matches the shape of the mesh belt. The upper conveyor belt is wound around the rotating cage by cooperating with the support guide rail.

[0040] Compared with the prior art, the present invention has the following beneficial effects:

[0041] The circulating belt tensioning device and the quick-freezing machine using it provided by this invention can adjust the preload according to the running state of the conveyor belt, so that the tension at each point on the conveyor belt is uniform, which greatly reduces the failure rate and makes the circulating belt tensioning device and the quick-freezing machine system using it run smoothly and reliably; improves the working efficiency of the quick-freezing machine and reduces production costs. Attached Figure Description

[0042] To more clearly illustrate the technical solution proposed by the present invention, a detailed description is provided below in conjunction with the embodiments and accompanying drawings. It should be understood that the accompanying drawings described below are merely some embodiments of the present invention, and those skilled in the art can make changes to these drawings under the concept of the present invention.

[0043] Figure 1 This is an overall schematic diagram of an embodiment of the circulating belt tensioning device provided by the present invention used in a spiral quick-freezing machine;

[0044] Figure 2 A top view schematic diagram of an embodiment of the circulating belt tensioning device provided by the present invention used in a spiral quick-freezing machine;

[0045] Figure 3 This is a schematic front view of an embodiment of the recirculating belt tensioning device provided by the present invention;

[0046] Figure 4 A cross-sectional view of an embodiment of the recirculating belt tensioning device provided by the present invention;

[0047] Figure 5 A schematic diagram of the axial side structure of an embodiment of the circulating belt tensioning device provided by the present invention;

[0048] Figure 6 A top view of an embodiment of the circulating belt tensioning device provided by the present invention;

[0049] Figure 7 This is a right-hand view of an embodiment of the cyclic belt tensioning device provided by the present invention.

[0050] The main markings in the attached figures are as follows:

[0051] 1. Casing; 11. Feed inlet; 12. Discharge outlet; 2. Rotary drum; 21. First rotary drum; 22. Second rotary drum; 3. Evaporator; 4. Circulating belt tensioning device; 41. Top plate; 411. Displacement sensor; 412. Signal sensing element; 42. Guide structure; 43. Vertical plate; 44. Movable rod; 45. Upper support arm; 451. Upper bearing; 46. Lower support arm; 461. Lower bearing; 47. Drive unit; 471. Connecting piece; 48. Upper roller; 49. Lower roller; 481. Upper rotating shaft; 491. Lower rotating shaft; 5. Circulating belt; 51. Upper conveyor belt; 52. Lower conveyor belt; 6. Rotating device; 61. First rotating device; 62. Second rotating device. Detailed Implementation

[0052] To make the technical problem to be solved, the technical solution and the beneficial effects of the present invention clearer, the following description is provided in conjunction with the appendix. Figure 1-7 The present invention will be further described in detail with reference to embodiments.

[0053] Please refer to the following: Figure 1-7 The circulating belt tensioning device provided by the present invention includes:

[0054] A support frame; a pair of upper rollers 48 rotatably spaced on the upper part of the support frame; a pair of lower rollers 49 rotatably spaced on the lower part of the support frame; a guide structure 42 disposed on the support frame and extending between the upper rollers 48 and the lower rollers 49; a movable rod 44 movably mounted on the guide structure 42; a circulating belt 5, including an upper conveyor belt 51 and a lower conveyor belt 52 connected end to end, the second rotating cage 22 of the upper conveyor belt 51 abutting against the top of the support frame, and the lower conveyor belt 52 winding between the pair of lower rollers 49, the pair of upper rollers 48 and the movable rod 44; a sensing device disposed on the top of the support frame for sensing the displacement of the upper conveyor belt 51 relative to the top of the support frame as it descends; and a driving device for driving a movable rod 44 to reciprocate up and down along the guide structure 42 between the upper rollers 48 and the lower rollers 49 according to the magnitude of the displacement, so as to adjust the tension of the circulating belt 5 when the upper conveyor belt 51 sags.

[0055] Please refer to the following: Figure 3-7 In this embodiment, the support includes:

[0056] A top plate 41; a pair of vertical plates 43, spaced apart and connected to the two sides of the top plate 41 respectively; two pairs of upper support arms 45, respectively located at opposite ends of the upper part of the vertical plates 43, and a pair of upper rollers 48 respectively rotatably mounted between the two pairs of upper support arms 45; each pair of upper support arms 45 is preferably spaced apart and parallel to each other, and the upper support arms 45 are parallel to the vertical plates 43 and perpendicular to the top plate 41; two pairs of lower support arms 46, respectively located at opposite ends of the lower part of the vertical plates 43, and a pair of lower rollers 49 respectively rotatably mounted between the two pairs of lower support arms 46; each pair of lower support arms 46 is preferably spaced apart and parallel to each other, and the lower support arms 46 are parallel to the vertical plates 43 and perpendicular to the top plate 41; a pair of guide structures 42 are respectively arranged parallel to each other on the pair of vertical plates 43, and a movable rod 44 is movably mounted between the pair of guide structures 42.

[0057] Please refer to the following: Figure 3-7 In this embodiment, the upper support arm 45 and the lower support arm 46 are in the form of vertical side plates.

[0058] Please refer to the following: Figure 3-7 In this embodiment, the guide structure 42 is a strip-shaped through hole, and the two opposite ends of the movable rod 44 are respectively movably inserted into a pair of strip-shaped through holes; the driving device includes:

[0059] Drive unit 47 is mounted on vertical plate 43; connector 471 connects drive unit 47 and movable rod 44.

[0060] The drive unit 47 drives the movable rod 44 to reciprocate between the upper roller 48 and the lower roller 49 via the drive connector 471.

[0061] Please refer to the following: Figure 3-7In this embodiment, the guide structure 42 is a strip-shaped through hole with its extension direction perpendicular to the top plate 41.

[0062] Please refer to the following: Figure 3-7 In this embodiment, the drive unit 47 is an electro-hydraulic actuator, which is installed on the outer side of the vertical plate 43 facing away from the other vertical plate 43. The axial direction of the electro-hydraulic actuator is perpendicular to the axial direction of the movable rod 44. The connecting member 471 is an L-shaped angle plate fixedly connected between the output actuator of the electro-hydraulic actuator and the movable rod 44.

[0063] In another embodiment (not shown in the figure), the electro-hydraulic actuator is mounted on the inner side of the vertical plate 43 facing another vertical plate 43, the axis of the electro-hydraulic actuator is perpendicular to the axis of the movable rod 44, and the connecting member 471 is a strip plate fixedly connected between the output actuator of the electro-hydraulic actuator and the movable rod 44.

[0064] In another embodiment (not shown in the figure), the electro-hydraulic actuator is installed on the inner side of the vertical plate 43 facing another vertical plate 43, the axis of the electro-hydraulic actuator is perpendicular to the axis of the movable rod 44, the guide structure 42 is a strip-shaped guide groove provided on the inner side of the vertical plate 43 facing another vertical plate 43, and the opposite ends of the movable rod 44 are respectively movably installed in a pair of strip-shaped through holes.

[0065] In other embodiments, the drive unit 47 may be replaced by a linear drive unit such as a lead screw nut driven by a motor or a telescopic rod driven by a cylinder.

[0066] Please refer to the following: Figure 3-7 In this embodiment, the support also includes:

[0067] Two pairs of upper bearings 451 are respectively disposed on the opposite inner sides of two pairs of upper support arms 45; a pair of upper rotating shafts 481 are respectively rotatably installed between the two pairs of upper bearings 451; a pair of upper rollers 48 are respectively sleeved on the pair of upper rotating shafts 481; two pairs of lower bearings 461 are respectively disposed on the opposite inner sides of two pairs of lower support arms 46; a pair of lower rotating shafts 491 are respectively rotatably installed between the two pairs of lower bearings 461; a pair of lower rollers 49 are respectively sleeved on the pair of lower rotating shafts 491.

[0068] Please refer to the following: Figure 3-7 In this embodiment, the upper roller 48 and the lower roller 49 are parallel in axis, and the axis of the upper roller 48 and the lower roller 49 is parallel to the top plate 41 and perpendicular to the vertical plate 43, the upper support arm 45 and the lower support arm 46.

[0069] In this embodiment, the upper bearing 451 and the lower bearing 461 are mounted bearings.

[0070] Please refer to the following: Figure 3-7 In this embodiment, the sensing device includes:

[0071] Displacement sensor 411 is located at the top of the top plate 41 of the bracket; signal sensing element 412 is located on displacement sensor 411.

[0072] Please refer to the following: Figure 3-7 As a preferred embodiment of this example, a pair of displacement sensors 411 are provided, and the pair of displacement sensors 411 are spaced apart at the top of the top plate 41 of the bracket.

[0073] In this embodiment, the tension force F and the displacement X satisfy the following:

[0074] F = KX, where K is a constant determined by the material of the circulating belt tensioning device 4;

[0075] The distance S of the reciprocating lifting motion of the movable lever 44 satisfies:

[0076] S = aX + b, where a and b are proportional parameters, which are related to the length of the circulating belt 5 and the deformation of the circulating belt 5; b is the initial vector, which is related to the mechanical structure and assembly clearance of the circulating belt tensioning device 4.

[0077] Please see Figure 1 , 2 The present invention also provides a quick-freezing machine, including the above-mentioned circulating belt tensioning device 4.

[0078] Please see Figure 1 , 2 In this embodiment, the quick-freezing machine is a spiral quick-freezing machine, which includes:

[0079] The machine casing 1 includes an inlet 11 and an outlet 12, which are respectively located at opposite ends of the machine casing 1; a pair of rotating cages 2 (including a first rotating cage 21 near the inlet 11 and a second rotating cage 22 near the outlet 12), which are respectively located at opposite ends inside the machine casing 1; a pair of rotating devices 6 (including a first rotating device 61 matching the first rotating cage 21 and a second rotating device 62 matching the second rotating cage 22), which are respectively used to drive the pair of rotating cages 2 to rotate; an evaporator 3, which is located between the pair of rotating cages 2; a circulating belt tensioning device 4, which is located between the pair of rotating cages 2 and on one side of the evaporator 3; an upper conveyor belt 51, which is wound around the inlet 11, the pair of rotating cages 2 and the outlet 12; and a lower conveyor belt 52, which is wound around the outlet 12, a pair of lower rollers 49, a pair of upper rollers 48, a movable rod 44 and the inlet 11.

[0080] Please see Figure 1 , 2 In this embodiment, the circulating belt 5 is a mesh belt, the rotating cage 2 is provided with a support rail that matches the shape of the mesh belt, and the upper conveyor belt 51 is wound around the rotating cage 2 in cooperation with the support rail.

[0081] Please see Figure 1 ,2 In this embodiment, the first rotating cage 21 near the feed inlet 11 is provided with a mesh belt support rail spiraling upward at a certain angle, and the second rotating cage 22 near the discharge outlet 12 is provided with a mesh belt support rail spiraling downward at a certain angle. The mesh belt chain links of the circulating belt 5 face backward, so that the circulating belt 5 slides around the feed inlet 11, the first rotating cage 21, the second rotating cage 22 and the discharge outlet 12 in one direction.

[0082] Please see Figure 1 , 2 The working principle of the circulating belt tensioning device 4 and the quick-freezing machine (taking a spiral quick-freezing machine as an example) using the present invention is as follows:

[0083] 1. Frozen products enter the first rotating drum 21 through the upper conveyor belt 51 from the feed inlet 11 for freezing. The first rotating device 61 (motor) drives the first rotating drum 21 to rotate. The upper conveyor belt 51 spirals upward around the support guide rail of the first rotating drum 21. The upper conveyor belt 51 drags the frozen products to the top of the circulating belt tensioning device 4. The upper conveyor belt 51 contacts the signal sensing plate 412 on the circulating belt tensioning device 4. The upper conveyor belt 51 continues to move forward to the second rotating drum 22. The second rotating device 62 (motor) drives the second rotating drum 22 to rotate. The upper conveyor belt 51 spirals downward around the support guide rail of the second rotating drum 22. The frozen products leave the second rotating drum 22, completing the freezing process. The upper conveyor belt 51 carries the frozen products to the discharge outlet 12. The upper conveyor belt 51 moves downward around the discharge outlet 12, becoming the lower conveyor belt 52. After being tensioned by the circulating belt tensioning device 4, it returns to the feed inlet 11.

[0084] 2. When the upper conveyor belt 51, carrying the frozen goods, reaches directly above the circulating belt tensioning device 4, the upper conveyor belt 51 contacts the signal sensing plate 412 on the circulating belt tensioning device 4. The weight of the frozen goods causes the upper conveyor belt 51 to sag. The displacement sensor 411 determines the downward displacement X of the upper conveyor belt 51 through the signal sensing plate 412. The drive unit 47 (electro-hydraulic actuator) applies a downward force to the movable rod 44, causing the movable rod 44 to move downward a distance S along the guide structure to tighten the lower conveyor belt 52, thereby adjusting the tension of the circulating belt 5. The tension force F and the displacement X satisfy: F = KX, where K is a constant determined by the material of the circulating belt tensioning device 4. The distance S of the reciprocating lifting and lowering motion of the movable rod 44 satisfies: S = aX + b, where a and b are system constants.

[0085] The circulating belt tensioning device and the quick-freezing machine using it provided by the present invention can monitor the running status of the circulating belt 5 (upper conveyor belt 51) in real time through the displacement sensor 411 installed in the circulating belt tensioning device 4. According to the running status of the circulating belt 5, when the upper conveyor belt 51 becomes loose or sags due to the weight of the frozen products it carries, the height of the movable rod 44 is automatically adjusted in time by the drive device. Thus, the change in the height of the movable rod 44 acts on the lower conveyor belt 52 moving around it, realizing the rapid and precise adjustment of the pretension of the circulating belt 5. This ensures that the tension is uniform at all points on the circulating belt 5, greatly reducing the failure rate of the circulating belt operation. It also makes the circulating belt tensioning device and the quick-freezing machine system using it operate smoothly and reliably, improving the working efficiency of the quick-freezing machine and reducing production costs.

[0086] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the invention.

Claims

1. A circulating belt tensioning device, characterized in that, include: support; A pair of upper rollers are rotatably and spaced apart on the upper part of the bracket; A pair of lower rollers are rotatably and spaced apart at the lower part of the bracket; A guide structure is provided on the bracket and extends between the upper roller and the lower roller; A movable rod is movably mounted to the guide structure; The circulating belt includes an upper conveyor belt and a lower conveyor belt connected end to end. The upper conveyor belt abuts against the top of the support, and the lower conveyor belt is wound between a pair of lower rollers, a pair of upper rollers and the movable rod. A sensing device, located at the top of the support, is used to sense the displacement of the upper conveyor belt relative to the top of the support as it descends. A drive device is used to drive a movable rod to reciprocate up and down between the upper and lower rollers along the guide structure according to the displacement magnitude, so as to adjust the tension of the circulating belt when the upper conveyor belt sags. The support includes: roof; A pair of vertical panels are arranged at relative intervals and respectively connected to both sides of the top panel; Two pairs of upper support arms are respectively located at opposite ends of the upper part of the vertical plate, and a pair of upper rollers are respectively rotatably installed between the two pairs of upper support arms; Two pairs of lower support arms are respectively located at opposite ends of the lower part of the vertical plate, and a pair of lower rollers are respectively rotatably installed between the two pairs of lower support arms; The pair of guide structures are respectively arranged in parallel on the pair of vertical plates, and the movable rod is movably installed between the pair of guide structures; The guide structure is a strip-shaped through hole, and the movable rod is movably inserted into a pair of strip-shaped through holes; The driving device includes: A drive unit is mounted on the vertical plate; a connector connects the drive unit and the movable rod. The drive unit drives the movable rod to reciprocate up and down between the upper roller and the lower roller by driving the connecting member; The sensing device includes: A displacement sensor is located at the top of the bracket; A signal sensing element is disposed on the displacement sensor; The tension force F and the displacement X satisfy: F=KX, where K is a constant determined by the material of the cyclic belt tensioning device; The distance S of the reciprocating lifting motion of the movable rod satisfies: S=aX+b, where a is a proportional parameter, which is related to the length of the circulating belt and the amount of deformation of the circulating belt; b is the initial offset, which is related to the mechanical structure and assembly clearance of the circulating belt tensioning device.

2. The circulating belt tensioning device as described in claim 1, characterized in that, The drive unit is an electro-hydraulic actuator, the axis of which is perpendicular to the axis of the movable rod, and the connecting member is an L-shaped angle plate fixedly connected between the output actuator and the movable rod of the electro-hydraulic actuator.

3. The circulating belt tensioning device as described in claim 1, characterized in that, The support also includes: Two pairs of upper bearings are respectively disposed on the opposite inner sides of the two pairs of upper support arms; a pair of upper rotating shafts are respectively rotatably mounted between the two pairs of upper bearings; a pair of upper rollers are respectively sleeved on the pair of upper rotating shafts. Two pairs of lower bearings are respectively disposed on the opposite inner sides of the two pairs of lower support arms; a pair of lower rotating shafts are respectively rotatably mounted between the two pairs of lower bearings; a pair of lower rollers are respectively sleeved on the pair of lower rotating shafts.

4. A quick-freezing machine, characterized in that, Includes the recirculating belt tensioning device as described in any one of claims 1-3.

5. The quick-freezing machine as described in claim 4, characterized in that, The quick-freezing machine is a spiral quick-freezing machine, which includes: The housing has an inlet and an outlet, which are respectively located at opposite ends of the housing. A pair of rotating cylinders are respectively located at opposite ends inside the casing; A pair of rotating devices, each used to drive a pair of rotating cages to rotate; An evaporator is disposed between the pair of said rotating drums; The circulating belt tensioning device is located between a pair of rotating drums and on one side of the evaporator; The upper conveyor belt is wound around the feed inlet, a pair of rotating drums and the discharge outlet, and the lower conveyor belt is wound around the discharge outlet, a pair of lower rollers, a pair of upper rollers, the movable rod and the feed inlet.

6. The quick-freezing machine as described in claim 5, characterized in that, The circulating belt is a mesh belt, and the rotating cage is provided with a support guide rail that matches the shape of the mesh belt. The upper conveyor belt is wound around the rotating cage in cooperation with the support guide rail.

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