Manual door curtain lifting device

Abstract

The utility model relates to a manual door curtain lifting device which comprises a protective cover shell, a door curtain rotating shaft is arranged in the protective cover shell, a lifting door curtain is arranged on the door curtain rotating shaft, the two sides of the door curtain rotating shaft are fixed to the protective cover shell through door curtain rotating shaft bases, a straight bevel gear is arranged on the door curtain rotating shaft, and the straight bevel gear drives a first chain wheel. The first chain wheel is connected with a second chain wheel through a chain, a second chain wheel shaft is arranged in the second chain wheel, a ratchet wheel is further arranged on the second chain wheel shaft, a hand wheel is arranged at the outer end of the second chain wheel shaft, the inner end of the second chain wheel shaft is fixed to the protective cover shell through a hand wheel installation base, and a ratchet wheel locking mechanism is arranged on the ratchet wheel and connected with the insertion type positioning rod. The hand wheel rotates to drive the two chain wheels, so that the door curtain rotating shaft rotates to drive the door curtain to be pulled up or down, operation is convenient, and time and labor are saved; in addition, through the arrangement of the ratchet device, one-way or two-way locking of the chain wheel can be achieved, the structure is simple, operation is convenient, and safety and reliability are achieved.

Description

Technical Field

[0001] This utility model relates to a manual door curtain lifting device, which can be applied to flat plate heat exchangers, etc. Background Technology

[0002] Flat-plate quick-freezing equipment often uses contact heat exchange for refrigeration. The doors within these units should be simple, lightweight, and easy to access for products. There are many installation methods for the doors; a lifting curtain structure is one such method. When freezing products, the curtain is closed to prevent cold air loss. Once the products are frozen, the curtain is raised to remove them. When raising or lowering the curtain, it must stop at any position according to usage requirements. Electric curtain lifting structures typically use a tubular motor installed inside the curtain's shaft. Tubular motors cannot withstand long-term operation and have a high failure rate, requiring frequent replacement. Another type, manual curtain lifting, uses a worm gear for self-locking. However, limitations in space, reduction ratio, and machining accuracy result in a complex lifting and locking mechanism, high cost, and long delivery times, which is detrimental to mass production. Summary of the Invention

[0003] The purpose of this invention is to overcome the above-mentioned shortcomings and provide a manual door curtain lifting device with simple structure and high safety performance.

[0004] The purpose of this utility model is achieved through the following technical solution: A manual door curtain lifting device includes a protective cover, a door curtain pivot inside the protective cover, a lifting door curtain on the door curtain pivot, both sides of the door curtain pivot are fixed to the protective cover by door curtain pivot seats, a straight bevel gear is provided on the door curtain pivot, the straight bevel gear drives a first sprocket, the first sprocket is connected to a second sprocket through a chain, a second sprocket shaft is provided in the second sprocket, a ratchet is also provided on the second sprocket shaft, a handwheel is provided at the outer end of the second sprocket shaft, the inner end of the second sprocket shaft is fixed to the protective cover by a handwheel mounting seat, a ratchet locking mechanism is provided on the ratchet, and the ratchet locking mechanism is connected to an insert positioning rod.

[0005] A further improvement of this utility model is that: a first sprocket shaft is provided in the straight bevel gear, the outer end of the first sprocket shaft is placed in the first sprocket shaft seat, the first sprocket shaft seat is fixed on the protective cover, and a first sprocket is sleeved on the first sprocket shaft.

[0006] A further improvement of this utility model is that a chain tensioning device is installed in the middle of the chain.

[0007] A further improvement of this utility model is that the ratchet locking mechanism includes a cam block, with pawls on both sides of the cam block, and a compression spring on the outer side of each pawl.

[0008] A further improvement of this utility model is that the insertable positioning rod is connected to the cam block through the shaft plate, and the insertable positioning rod is inserted into the hole groove.

[0009] A further improvement of this utility model is that the insertable positioning rod includes a spring sleeve and a pin, and pulling the spring sleeve can pull the pin out of the hole.

[0010] A further improvement of this invention is that the diameter of the first sprocket is smaller than the diameter of the second sprocket.

[0011] A further improvement of this utility model is that the lifting curtain equipped with a counterweight slides on the inclined protective cover slide rail.

[0012] This utility model has the following advantages compared with the prior art:

[0013] The handwheel drives two sprockets, which in turn rotate the curtain shaft, causing the curtain to be pulled up or down. This is convenient, time-saving, and labor-saving. In addition, the ratchet mechanism allows for one-way or two-way locking of the sprockets. The structure is simple, easy to operate, and safe and reliable. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 This is a schematic diagram of the structure of the door curtain pivot.

[0016] Figure 3 This is a schematic diagram of the handwheel structure;

[0017] Figure 4 This is a schematic diagram of the transmission part;

[0018] Figure 5 This is a schematic diagram of the ratchet mechanism;

[0019] Figure 6 This is a schematic diagram of the ratchet turning left.

[0020] Figure 7 This is a schematic diagram of a ratchet self-locking mechanism, indicating that the curtain is in a self-locking state.

[0021] Figure 8 This is a schematic diagram of the ratchet turning right.

[0022] The following are the labels in the diagram: 1-Protective cover, 2-Curtain pivot, 3-Lifting curtain, 4-Curtain pivot seat, 5-Straight bevel gear, 6-First sprocket, 7-Chain, 8-Second sprocket, 9-Second sprocket shaft, 10-Ratchet, 11-Handwheel, 12-Handwheel mounting seat, 13-Ratchet locking mechanism, 13-1-Cam block, 13-2-Pawl, 13-3-Compression spring, 14-Insertion positioning rod, 14-1-Spring sleeve, 14-2-Pin, 15-First sprocket shaft, 16-First sprocket shaft seat, 17-Chain tensioning device, 18-Shaft plate, 19-Groove. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Elements and features described in one embodiment of this utility model can be combined with elements and features shown in one or more other embodiments. It should be noted that, for clarity, representations and descriptions of components and processes unrelated to this utility model and known to those skilled in the art are omitted in the description. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0024] like Figure 1 As shown, the manual curtain lifting device includes a sprocket drive mechanism, a ratchet locking mechanism, a straight bevel gear drive mechanism, and curtain rotation components. The soft-lifting curtain is riveted to the curtain shaft 2, which is mounted on curtain shaft seats 4 on both sides. Straight bevel gears 5 are installed on the curtain shaft 2, and the transmission direction is changed through the straight bevel gear pair. Then, the force is transmitted to the second sprocket shaft 9 on the front of the device through the first and second sprocket pairs. The second sprocket shaft 9 is equipped with a ratchet locking mechanism 13 and an insert positioning rod 14.

[0025] like Figure 2 As shown, the straight bevel gear 5 is mounted on the door curtain shaft 2. The mating straight bevel gear 5 and the first sprocket 6 of the chain drive are mounted on the first sprocket seat 16 through a shaft. The first sprocket seat 16 is mounted on the protective cover 1. The transmission direction is changed by the straight bevel gear pair, so that the handwheel 11 can be mounted on the front of the device, which facilitates the operation of the device.

[0026] like Figure 3 As shown, the handwheel 11, ratchet 10, and second sprocket 8 are mounted on the handwheel mounting base 12 via shafts, and the handwheel mounting base 12 is mounted on the protective cover 1. The second sprocket 8 is driven by the first sprocket 6 via a chain 7, and a chain tensioning device 17 is installed in the middle of the chain 7. By calculating a reasonable transmission ratio and torque, an appropriate number of teeth on the sprockets is selected. The diameter of the first sprocket 6 is smaller than the diameter of the second sprocket 8.

[0027] like Figure 4As shown, pulling the spring sleeve 14-1 in the insertion positioning rod 14 pulls out the pin 14-2 in the insertion positioning rod 14. Rotating it to the left or right and inserting the pin 14-2 into the slot 19, manually turning the handwheel causes the second sprocket 8 on the same shaft to rotate, which in turn rotates the first sprocket 6 via the chain 7. The first sprocket 6 drives the straight bevel gear pair to rotate, which in turn drives the curtain shaft 2 to rotate, thus achieving the up and down movement of the soft curtain. The lifting curtain, equipped with a counterweight, slides on the inclined protective cover rail, allowing the curtain to better conform to the rail of the protective cover.

[0028] like Figure 5 As shown, the pull-in positioning rod 14 and the cam block 13-1 in the ratchet mechanism are connected as one unit via a shaft. When the pull-in positioning rod 14 rotates clockwise to the right slot 19, the cam block 13-1 deflects to the left. When the pull-in positioning rod 14 rotates counterclockwise to the left slot 19, the cam block 13-1 deflects to the right. When the pull-in positioning rod 14 is in the neutral position, the cam block 13-1 is also in the neutral position. The ratchet locking mechanism 13 consists of a bidirectional pawl 13-2, a compression spring 13-3, and the cam block 13-1.

[0029] like Figure 6-8 As shown, the insertable positioning rod 14 is inserted into the left slot 19 by rotating counterclockwise. The cam block 13-1 deflects to the right and presses down on the right pawl 13-2, causing the right pawl 13-2 to release the ratchet. The handwheel 11 is manually rotated counterclockwise, and the ratchet 10 also rotates counterclockwise. The left pawl 13-2 jumps on the tooth surface of the ratchet 10 under the action of the compression spring 13-3. When the handwheel 11 stops rotating, the left pawl 13-2 presses against the tooth surface of the ratchet 10, thus realizing the one-way locking function. When the curtain is raised to the highest side, it is necessary to handle frozen products for a long time. The insertable positioning rod 14 needs to be rotated to the middle position. At this time, the cam block 13-1 is also in the middle position. At this time, the two-way pawl 13-2 is locked into the tooth surface of the ratchet 10 by the action of the compression spring 13-3, thus realizing the two-way locking function. When the insertion positioning rod 14 is rotated clockwise into the right side slot 19, the cam block 13-1 deflects to the left and presses against the left pawl 13-2, causing the left pawl 13-2 to release the ratchet. When the handwheel 11 is manually rotated clockwise, the ratchet 10 also rotates clockwise. Under the action of the compression spring 13-3, the right pawl 13-2 jumps on the tooth surface of the ratchet 10. When the handwheel stops rotating, the right pawl 13-2 presses against the tooth surface of the ratchet 10, thereby realizing the one-way locking function on the other side, thus realizing the locking function of the door curtain.

[0030] Finally, it should be noted that although the present invention and its advantages have been described in detail above, it should be understood that various changes, substitutions, and modifications can be made without departing from the spirit and scope of the present invention as defined by the appended claims. Furthermore, the scope of the present invention is not limited to the specific embodiments of the processes, apparatus, means, methods, and steps described in the specification. Those skilled in the art will readily understand from the disclosure of the present invention that existing and future processes, apparatus, means, methods, or steps that perform substantially the same function or obtain substantially the same result as the corresponding embodiments described herein can be used according to the present invention. Therefore, the appended claims are intended to include such processes, apparatus, means, methods, or steps within their scope.

Claims

1. A manual door curtain lifting device, comprising a protective cover (1), a door curtain pivot (2) provided inside the protective cover (1), a lifting door curtain (3) provided on the door curtain pivot (2), and both sides of the door curtain pivot (2) being fixed to the protective cover (1) by door curtain pivot seats (4), characterized in that: A straight bevel gear (5) is provided on the door curtain pivot (2). The straight bevel gear (5) drives the first sprocket (6). The first sprocket (6) is connected to the second sprocket (8) through the chain (7). The second sprocket (8) is provided with a second sprocket shaft (9). The second sprocket shaft (9) is also provided with a ratchet (10). The outer end of the second sprocket shaft (9) is provided with a handwheel (11). The inner end of the second sprocket shaft (9) is fixed to the protective cover (1) through the handwheel mounting seat (12). The ratchet (10) is provided with a ratchet locking mechanism (13). The ratchet locking mechanism (13) is connected to the insert positioning rod (14).

2. The manual door curtain lifting device according to claim 1, characterized in that: The straight bevel gear (5) is provided with a first sprocket shaft (15), the outer end of the first sprocket shaft (15) is placed in the first sprocket shaft seat (16), the first sprocket shaft seat (16) is fixed on the protective cover (1), and the first sprocket (6) is sleeved on the first sprocket shaft (15).

3. The manual door curtain lifting device according to claim 2, characterized in that: A chain tensioning device (17) is installed in the middle of the chain (7).

4. The manual door curtain lifting device according to claim 3, characterized in that: The ratchet locking mechanism (13) includes a cam block (13-1), with pawls (13-2) on both sides of the cam block (13-1), and a compression spring (13-3) on the outer side of each pawl (13-2).

5. The manual door curtain lifting device according to claim 4, characterized in that: The insertable positioning rod (14) is connected to the cam block (13-1) through the shaft plate (18), and the insertable positioning rod (14) is inserted into the slot (19).

6. The manual door curtain lifting device according to claim 5, characterized in that: The insert positioning rod (14) includes a spring sleeve (14-1) and a pin (14-2). Pulling the spring sleeve (14-1) can pull the pin (14-1) out of the slot (20).

7. The manual door curtain lifting device according to claim 1, characterized in that: The diameter of the first sprocket (6) is smaller than the diameter of the second sprocket (8).

8. The manual door curtain lifting device according to claim 1, characterized in that: The lifting curtain (3) equipped with counterweight slides on the inclined protective cover rail.

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