Conveyor belt speed change device

Abstract

A conveyor belt speed change device relates to the technical field of conveyor belts, and comprises a rack, a front roller, a power roller and a rear roller which are arranged on the rack in a front-middle-rear manner, and a speed change device which is arranged at the side part of the rack and is matched with the front roller, the power roller and the rear roller, the speed change device comprises a first speed change wheel, a second speed change wheel and a third speed change wheel which are arranged on a power shaft of the power roller; the second change wheel can move back and forth in the axial direction of the power shaft to be matched with the first change wheel or the third change wheel, and the forward rotation or reverse rotation change switching action is formed. Variable speed switching is achieved through a mechanical structure, use of complex electronic elements such as an electromagnetic clutch is avoided, and production cost and maintenance cost are reduced. The speed change switching process is simple and reliable, and the stability and reliability of the system are improved.

Description

Technical Field

[0001] This utility model relates to the field of conveyor belt technology, and specifically to a conveyor belt speed change device. Background Technology

[0002] In the modern food processing industry, dough puffing machines are crucial equipment, and their performance and efficiency directly impact product quality and production costs. Traditional dough puffing machines typically employ two differential speed conveyor belts positioned at the front and back, with a flattening device between them. Through a continuous, cyclical pressing and puffing process, the desired puffing effect is achieved. While this design meets the basic requirements for dough puffing to a certain extent, some problems still need to be addressed during actual operation and maintenance.

[0003] In particular, existing conveyor belt speed change devices, such as the one proposed in utility model patent publication number CN217024034U, although achieving the connection and switching between the fourth and sixth speed change wheels and the roller shaft through the engagement function of the electromagnetic clutch, thus forming a forward or reverse speed change action and improving the flexibility and efficiency of dough puffing, have brought new problems.

[0004] First, the working principle of an electromagnetic clutch relies on the generation of a magnetic field by applying electricity. The strength of this magnetic field needs to be precisely controlled to ensure the accuracy and stability of gear shifting. This increases the technical difficulty and cost in actual operation. Second, the production cost of electromagnetic clutches is relatively high, and due to their complex structure, they are prone to damage during use, leading to equipment downtime for maintenance. This not only affects production efficiency but also increases maintenance costs.

[0005] Secondly, there are currently structures that use mechanical mechanisms to drive the gear shifting wheel to move back and forth to achieve forward or reverse speed switching. Generally, the end of the power roller shaft is fixed with a simple screw structure. The mechanical structure drives the gear shifting wheel to move back and forth. When the second gear shifting wheel comes into contact with the third gear shifting wheel, an instantaneous impact occurs. During the impact, the gear shifting wheel is prone to damage to the end structure, causing the screws of the end structure to break. Once this happens, the machine needs to be stopped for maintenance, wasting manpower and resources. Utility Model Content

[0006] The purpose of this invention is to propose a conveyor belt speed change device that can reduce production and maintenance costs while ensuring the accuracy and stability of speed switching, and improve the overall performance and economic benefits of the dough puffing machine.

[0007] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0008] A conveyor belt speed change device includes a frame, a front roller, a power roller, and a rear roller arranged in a front, middle, and rear configuration on the frame, and a speed change device disposed on the side of the frame and cooperating with the front roller, the power roller, and the rear roller. The speed change device includes a first speed change wheel, a second speed change wheel, and a third speed change wheel disposed at the power shaft position of the power roller; wherein the second speed change wheel can move back and forth along the axial direction of the power shaft and cooperate with the first speed change wheel or the third speed change wheel to form a forward or reverse speed change switching action.

[0009] Furthermore, the speed change device also includes a fourth speed change wheel and a fifth speed change wheel disposed at the front roller shaft position of the front roller, and a sixth speed change wheel and a seventh speed change wheel disposed at the rear roller shaft position of the rear roller;

[0010] The first gear shifter is connected to the fourth gear shifter, the second gear shifter is connected to both the fifth and sixth gear shifters, and the third gear shifter is connected to the seventh gear shifter.

[0011] Furthermore, the diameter of the first gear shifter is smaller than that of the fourth gear shifter, the diameter of the second gear shifter is larger than that of the fifth and sixth gear shifters, and the diameter of the third gear shifter is smaller than that of the seventh gear shifter.

[0012] Furthermore, the first, second, third, fourth, fifth, sixth, and seventh gears are spur gears, and the gears are driven by meshing with toothed belts.

[0013] Furthermore, an adjusting thread is formed on the power shaft of the power roller, and the adjusting thread is threadedly connected to the second speed-changing wheel.

[0014] Under the constraint of the toothed belt, the power roller rotates clockwise, driving the second gear wheel to move forward and press against the third gear wheel, thus synchronously driving the third gear wheel to rotate.

[0015] Under the constraint of the toothed belt, the power roller rotates counterclockwise, driving the second gear wheel to move backward and press against the first gear wheel, thus synchronously driving the first gear wheel to rotate.

[0016] Furthermore, the fifth and sixth gear wheels are connected to the roller shaft via one-way bearings, the fourth and seventh gear wheels are fixedly connected to the roller shaft, and the first and third gear wheels are connected to the roller shaft via two-way bearings.

[0017] The one-way bearing connected to the fifth gear shift wheel has a counterclockwise rotation direction; the one-way bearing connected to the sixth gear shift wheel has a clockwise rotation direction.

[0018] Furthermore, it also includes a mounting bracket, within which the transmission device is housed.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] This invention achieves speed switching through a mechanical structure, avoiding the use of complex electronic components such as electromagnetic clutches, thus reducing production and maintenance costs. The speed switching process is simple and reliable, improving the stability and reliability of the system. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of this utility model;

[0023] Figure 2 for Figure 1 A magnified view of a portion of the image;

[0024] Figure 3 This is a schematic diagram of the hidden toothed belt of this utility model;

[0025] Figure 4 for Figure 3 A magnified view of a portion of the image;

[0026] Figure 5 This is a schematic diagram of the exploded structure of this utility model;

[0027] Figure 6 This is a schematic diagram of the gearbox structure according to another embodiment of the present invention;

[0028] Figure 7 This is a schematic diagram of the power roller structure according to another embodiment of the present invention;

[0029] Figure 8 This is a partial cross-sectional schematic diagram of the power roller according to another embodiment of the present invention;

[0030] Figure 9 This is a schematic diagram of the exploded structure of the power roller according to another embodiment of the present invention. Detailed Implementation

[0031] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0032] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0033] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0034] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0035] like Figure 1-5 As shown, a conveyor belt speed change device includes a frame, a front roller 2, a power roller 1, and a rear roller 3 arranged in a front, middle, and rear configuration on the frame, and a speed change device disposed on the side of the frame and cooperating with the front roller 2, the power roller 1, and the rear roller 3. The speed change device includes a first speed change wheel 72, a second speed change wheel 73, and a third speed change wheel 74 disposed at the position of the power shaft 4 of the power roller 1. The second speed change wheel 73 can move back and forth along the axial direction of the power shaft 4 and cooperate with the first speed change wheel 72 or the third speed change wheel 74 to form a forward or reverse speed change switching action.

[0036] The drive roller serves as the power source for the entire conveyor belt system, and its rotation is powered by an external drive device (such as a motor). The rotation of the drive roller drives the speed-changing wheel on its drive shaft. The front roller 2 serves as the power source for driving the front conveyor belt, and the rear roller 3 serves as the power source for driving the rear transmission belt.

[0037] The second gear pulley can move back and forth along the axial direction of the drive shaft. When the drive roller rotates clockwise, it drives the second gear pulley forward via the toothed belt until it engages tightly with the third gear pulley. At this time, the rotational force of the drive roller is transmitted to the front roller through the second and third gear pulleys, causing the front conveyor belt to rotate rapidly in the forward direction. Simultaneously, the rotational force is transmitted to the rear roller through the second and third gear pulleys, causing the rear conveyor belt to rotate slowly in the forward direction. The reverse situation will be described in detail in the following description of the working principle.

[0038] This invention achieves speed switching through a mechanical structure, avoiding the use of complex electronic components such as electromagnetic clutches, thus reducing production and maintenance costs. The speed switching process is simple and reliable, improving the stability and reliability of the system.

[0039] Specifically, as shown in the figure, the speed change device further includes a fourth speed changer 75 and a fifth speed changer 76 disposed at the position of the front roller shaft 5 of the front roller 2, and a sixth speed changer 78 and a seventh speed changer 79 disposed at the position of the rear roller shaft 6 of the rear roller 3; the first speed changer 72 is drivenly connected to the fourth speed changer 75, the second speed changer 73 is drivenly connected to both the fifth speed changer 76 and the sixth speed changer 78, and the third speed changer 74 is drivenly connected to the seventh speed changer 79. The first speed changer 72, the second speed changer 73, the third speed changer 74, the fourth speed changer 75, the fifth speed changer 76, the sixth speed changer 78, and the seventh speed changer 79 are spur gears, and the gears are meshed and driven by a toothed belt 77. The diameter of the first gear shifter 72 is smaller than that of the fourth gear shifter 75, the diameter of the second gear shifter 73 is larger than that of the fifth gear shifter 76 and the sixth gear shifter 78, and the diameter of the third gear shifter 74 is smaller than that of the seventh gear shifter 79.

[0040] The second gear-changing wheel 73 can move back and forth along the axial direction of the power shaft 4, which is the key to realizing gear switching. When the power roller 1 rotates, the second gear-changing wheel 73 is driven to move forward or backward by adjusting the screw thread.

[0041] Depending on the position of the second gear shift wheel 73, it engages with different gear shift wheels. When the second gear shift wheel 73 moves forward, it engages tightly with the third gear shift wheel 74 to form a forward rotation transmission path; when the second gear shift wheel 73 moves backward, it engages tightly with the first gear shift wheel 72 to form a reverse rotation transmission path.

[0042] Furthermore, the diameter of the first gearshift wheel 72 is smaller than that of the fourth gearshift wheel 75, causing the power to slow down during transmission; while the diameter of the second gearshift wheel 73 is larger than that of the fifth gearshift wheel 76 and the sixth gearshift wheel 78, causing the power to accelerate during transmission. Similarly, the diameter of the third gearshift wheel 74 is smaller than that of the seventh gearshift wheel 79, which also results in a speed reduction transmission.

[0043] Specifically, as shown in the figure, an adjusting thread 41 is formed on the power shaft 4 of the power roller 1, and the adjusting thread 41 is threadedly connected to the second speed-changing wheel 73.

[0044] Under the constraint of the toothed belt 77, the power roller 1 rotates clockwise, driving the second speed change wheel 73 to move forward and press against the third speed change wheel 74, thus synchronously driving the third speed change wheel 74 to rotate.

[0045] Under the constraint of the toothed belt 77, the power roller 1 rotates counterclockwise, causing the second gear wheel 73 to move backward and press against the first gear wheel 72, thus synchronously driving the first gear wheel 72 to rotate.

[0046] Specifically, as shown in the figure, the fifth gear wheel 76 and the sixth gear wheel 78 are connected to the roller shaft through one-way bearings, the fourth gear wheel 75 and the seventh gear wheel 79 are fixedly connected to the roller shaft, and the first gear wheel 72 and the third gear wheel 74 are connected to the roller shaft through two-way bearings.

[0047] The one-way bearing connected to the fifth gear shift wheel 76 has a counterclockwise rotation direction; the one-way bearing connected to the sixth gear shift wheel 78 has a clockwise rotation direction.

[0048] Specifically, as shown in the figure, it also includes a mounting bracket 71, and the speed change device is disposed within the mounting bracket 71.

[0049] When the power roller rotates clockwise (forward), the states of each gear shifter are as follows:

[0050] Second gear shifter 73: When the power roller 1 rotates clockwise, the adjusting thread 41 on its power shaft 4 engages with the internal thread of the second gear shifter 73, pushing the second gear shifter 73 to move forward axially. Under the constraint of the toothed belt 77, the second gear shifter 73 and the third gear shifter 74 are tightly pressed together, synchronously driving the third gear shifter 74 to rotate.

[0051] Third gear pulley 74: Due to its close cooperation with the second gear pulley 73, the third gear pulley 74 rotates clockwise with the power roller 1. The third gear pulley 74 is connected to the seventh gear pulley 79 via a toothed belt 77, so the seventh gear pulley 79 also rotates, thereby driving the rear roller 3.

[0052] First gear shifter 72: When the power roller 1 rotates clockwise, the second gear shifter 73 moves forward and disengages from the first gear shifter 72. Therefore, the first gear shifter 72 is not affected by the second gear shifter 7. However, since the first gear shifter 72 is connected to the roller shaft through a double-direction bearing, the first gear shifter 72 can be affected by the fourth gear shifter 75. That is, when the fourth gear shifter 75 rotates clockwise, it drives the first gear shifter 72 to rotate clockwise through the toothed belt 77.

[0053] Fourth gear shift wheel 75: The fourth gear shift wheel 75 is fixedly connected to the roller shaft and its position does not change with the movement of other gear shift wheels.

[0054] When rotating clockwise, the fifth gear wheel 76 rotates, causing the front roller shaft 5 to rotate clockwise. The front roller shaft 5 then drives the fourth gear wheel 75 to rotate clockwise. The fourth gear wheel 75, through the toothed belt 77, drives the first gear wheel 72 to rotate clockwise.

[0055] Fifth gearshift wheel 76 and sixth gearshift wheel 78: The fifth gearshift wheel 76 is connected to the front roller shaft via a one-way bearing, and this one-way bearing allows counterclockwise rotation. Therefore, the second gearshift wheel 73 drives the fifth gearshift wheel 76 to rotate clockwise.

[0056] The sixth gear wheel 78 is also connected to the rear roller shaft via a one-way bearing, but is allowed to rotate clockwise. However, in the forward rotation state, the second gear wheel 73 drives the sixth gear wheel 78 to rotate clockwise without load.

[0057] It is worth mentioning that when the power roller rotates clockwise, the speed of the front conveyor belt is faster than that of the rear conveyor belt due to the cooperation of the large and small gears.

[0058] Similarly, when the power roller rotates counterclockwise (reverses), its working process can be derived through reverse reasoning, which makes the speed of the rear conveyor belt faster than that of the front conveyor belt, so it will not be described in detail here.

[0059] As another preferred embodiment of this utility model, such as Figure 6-9 As shown, the first gear shifter 72, the second gear shifter 73, the third gear shifter 74, the fourth gear shifter 75, the fifth gear shifter 76, the sixth gear shifter 78, and the seventh gear shifter 79 can also be sprockets, and the toothed belt 77 can be converted into a chain. It is worth mentioning that, in addition to the gear shifter, sprocket, toothed belt 77, and chain, other related mechanisms that can realize speed change transmission are also within the protection scope of this utility model.

[0060] As another preferred embodiment of the present invention, the end of the power shaft is provided with a double protection mechanism, which prevents the fixing structure at the end of the power shaft from breaking when the second gear wheel hits the third gear wheel.

[0061] The power shaft end of the power roller is provided with a connecting thread 42, and the top surface of the connecting thread 42 is provided with a keyway 43 in the axial direction. The double protection mechanism includes an inner pressure plate 81, an anti-detachment washer 83, and a round slotted nut 84 that are sequentially engaged with the connecting thread 42 in the axial direction.

[0062] The inner pressure plate 81 is sleeved inside the connecting thread 42, and a key block 82 is formed on the inner side of the inner pressure plate 81. The key block 82 is engaged in the keyway 43. The anti-detachment washer 83 is sleeved on the connecting thread 42, and the inner teeth of the anti-detachment washer 83 are engaged in the keyway 43. The round slotted nut 84 is threaded to the outside of the connecting thread 42, locking the anti-detachment washer 83 and the inner pressure plate 81. The outer claw of the anti-detachment washer 83 engages with the peripheral groove of the round slotted nut 84, forming a double-layer protection of anti-detachment and locking.

[0063] When the drive shaft is running, especially during gear shifting, if the second gear pulley may collide with the third gear pulley, the impact force generated by this collision may be transmitted to the end of the drive shaft. Due to the presence of the dual protection mechanism, particularly the tight fit between the inner pressure plate 81, the anti-detachment washer 83, and the slotted nut 84, this impact force is effectively dispersed and absorbed, thus preventing breakage of the drive shaft end fixing structure. The inner pressure plate 81 and the anti-detachment washer 83 achieve a secure connection with the drive shaft through the engagement of the key block 82 and the internal teeth with the keyway 43. The slotted nut 84 further locks the entire protection mechanism through threaded connection and slotted engagement, ensuring its stability and reliability during operation.

[0064] Specifically, as shown in the figure, the power shaft end of the power roller is provided with an internal threaded hole 44 along the axial center, and also includes a fixing screw that is threadedly connected to the internal threaded hole 44. After the inner pressure plate 81, the anti-loosening washer 83, and the slotted nut 84 are assembled, the fixing screw is screwed into the internal threaded hole 44 to press the slotted nut 84.

[0065] After the dual protection mechanism is assembled, it is further secured using fixing screws. The fixing screws are threaded into the internal threaded hole 44, and as the screws are tightened, the slotted nut 84 is gradually pressed down. Tightening the fixing screws not only increases the locking force of the slotted nut 84 on the anti-loosening washer 83 and the inner pressure plate 81, but also further stabilizes the connection between these components and the drive shaft through physical pressure, effectively preventing loosening or detachment that may occur during power transmission. Through the design of the internal threaded hole 44 and the fixing screws, the dual protection mechanism at the end of the drive shaft is further reinforced.

[0066] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

[0067] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A conveyor variable speed device comprising a frame, a front roller, a power roller, and a rear roller arranged in a front, middle, and rear arrangement on the frame, and further comprising a variable speed device arranged on the sides of the frame in cooperation with the front roller, power roller, and rear roller, characterized in that, The variable speed device comprises a first variable speed wheel, a second variable speed wheel and a third variable speed wheel arranged at the power shaft position of the power roller; the second variable speed wheel is movable forward and backward along the axial direction of the power shaft to cooperate with the first variable speed wheel or the third variable speed wheel to form the variable speed switching action of forward rotation or reverse rotation.

2. A variable speed conveyor belt apparatus as claimed in claim 1, wherein, The variable speed device further comprises a fourth variable speed wheel and a fifth variable speed wheel arranged at the front roller shaft position of the front roller, and a sixth variable speed wheel and a seventh variable speed wheel arranged at the rear roller shaft position of the rear roller. The first variable speed wheel is in driving connection with the fourth variable speed wheel, the second variable speed wheel is in driving connection with the fifth variable speed wheel and the sixth variable speed wheel at the same time, and the third variable speed wheel is in driving connection with the seventh variable speed wheel.

3. A variable speed conveyor belt apparatus as claimed in claim 2, wherein, The wheel diameter of the first variable speed wheel is smaller than that of the fourth variable speed wheel, the wheel diameter of the second variable speed wheel is larger than that of the fifth variable speed wheel and the sixth variable speed wheel, and the wheel diameter of the third variable speed wheel is smaller than that of the seventh variable speed wheel.

4. A variable speed conveyor belt apparatus as claimed in claim 3, wherein, The first variable speed wheel, the second variable speed wheel, the third variable speed wheel, the fourth variable speed wheel, the fifth variable speed wheel, the sixth variable speed wheel and the seventh variable speed wheel are straight gears, and the gears are in meshing transmission through the toothed belt.

5. A variable speed conveyor belt apparatus as claimed in claim 4, wherein, The power shaft of the power roller is formed with an adjusting thread, and the adjusting thread is in threaded connection with the second variable speed wheel. Under the constraint of the toothed belt, the power roller rotates clockwise to drive the second variable speed wheel to move forward and press-fit with the third variable speed wheel, and synchronously drive the third variable speed wheel to rotate. Under the constraint of the toothed belt, the power roller rotates counterclockwise to drive the second variable speed wheel to move backward and press-fit with the first variable speed wheel, and synchronously drive the first variable speed wheel to rotate.

6. A variable speed conveyor belt apparatus as claimed in claim 5, wherein, The fifth variable speed wheel and the sixth variable speed wheel are connected with the roller shaft through one-way bearings, the fourth variable speed wheel and the seventh variable speed wheel are fixedly connected with the roller shaft, and the first variable speed wheel and the third variable speed wheel are connected with the roller shaft through two-way bearings. The rotatable direction of the one-way bearing connected with the fifth variable speed wheel is counterclockwise, and the rotatable direction of the one-way bearing connected with the sixth variable speed wheel is clockwise.

7. A variable speed conveyor belt apparatus as claimed in claim 6, wherein The variable speed device is arranged in a mounting frame.

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