Sawtooth cam type belt backstop

Abstract

The utility model belongs to the technical field of belt conveyors, and particularly relates to a sawtooth cam type belt backstop which is characterized in that the sawtooth cam type belt backstop comprises cams, a wheel shaft and baffle rings, the two ends of the wheel shaft are fixedly connected with a belt conveyor rack, the wheel shaft is connected with more than two cams through keys, the baffle rings are arranged on the two sides of the cams, and the baffle rings are arranged on the wheel shaft. A spring retainer ring is arranged on the wheel shaft on the outer side of the baffle ring; a gap is formed between the key and the cam, and the cam is in a movable state within the range of 15 degrees; after the cam is installed, the distance between the upper edge of the cam and the bottom of the belt is not larger than 1 mm. Compared with the prior art, the device has the advantages that the device and the roller backstop can be used at the same time, normal functions of the roller backstop are not affected, and the device serves as an upgrading scheme for preventing material returning of the belt conveyor, friction force between the backstop and a belt can be further increased, resistance for preventing the belt from reversing is enhanced, smooth backstop is achieved, and the service life of the belt conveyor is prolonged. Accident handling time is reduced, and production efficiency is improved.

Description

Technical Field

[0001] This utility model belongs to the technical field of belt conveyors, and in particular relates to a sawtooth cam type belt backstop. Background Technology

[0002] Backstops are widely used in belt conveyors to prevent belt reversal and ensure safe operation. Their working principle primarily relies on friction and centrifugal force. During normal operation, the internal bearing rotates along with the external belt. When the belt reverses, the outer protrusion of the internal bearing contacts the outer casing, generating friction and preventing further reversal. Simultaneously, centrifugal force increases the pressure on the inner recess of the internal bearing, further strengthening the anti-reversal force. In inclined belt conveyors, roller backstops are used. Poor fit between the inclined belt and the roller backstop can lead to belt malfunctions and shutdowns. In such cases, the roller backstop is less effective, causing material to escape and impacting safe production.

[0003] Chinese utility model patent application number 202320473856.5 discloses a belt backstop, including a frame, a belt conveyor mechanism on the frame, the belt conveyor mechanism including a conveyor roller and a conveyor belt, the conveyor roller being rotatably connected to the frame, and the conveyor belt being sleeved on the outside of the conveyor roller; a fixed frame is provided on the frame and a backstop is connected to the fixed frame, both the fixed frame and the backstop are located inside the conveyor belt, the fixed frame is located on one side of the conveyor roller and is fixedly connected to the frame, one end of the backstop is fixedly connected to the fixed frame, and the other end of the backstop contacts the bottom end of the conveyor belt; when the conveyor roller rotates clockwise, the end of the backstop that contacts the conveyor belt is located on one side of the bottom end of the conveyor roller and the backstop has a bending allowance in the middle; when the conveyor roller rotates counterclockwise, the end of the backstop that contacts the conveyor belt wraps around the outside of the bottom end of the conveyor roller and the backstop is located between the conveyor roller and the conveyor belt.

[0004] Chinese utility model patent application number 202322176560.X discloses a belt backstop that prevents reverse rotation. It includes a support frame, a drive motor fixedly connected to the left side of the rear end of the support frame, a head pulley installed at the front end of the output shaft of the drive motor, and a tail pulley connected to the bearing at the right end of the inner side of the support frame. The head pulley and the outer side of the tail pulley are connected by a transmission belt. Through actual production research, this belt backstop has been improved by adding a backstop component, which is installed on the back of the lower belt. When the belt reverses, the belt pulls the backstop component into the head pulley, where it is locked between the belt and the head pulley. The head pulley is then pulled by the backstop component to stop the reverse rotation.

[0005] Chinese utility model patent application number 202120361158.7 discloses a backstop for a coal conveyor belt, including a base, a support column fixedly connected to the top outer wall of the base, a first support plate and a second support plate fixedly connected to the outer wall of the support column, a drive roller rotatably connected between the outer walls of the first and second support plates, and mounting plates fixedly connected to the outer walls of both the first and second support plates, with a driven roller rotatably connected between the outer walls of the mounting plates. When the stop band moves towards the drive roller, the compressed second spring causes the slider to return to its original position, which in turn causes the stop band to move towards the drive roller via a swing rod. The magnetic force of the second and third movable rods causes the third spring to contract, further pulling the swing rod. This device, through the combined use of the stop band, second spring, and other devices, forms a backstop. In the event of a power outage, the stop band moves towards the drive roller, braking it.

[0006] Existing backstop solutions mostly involve inserting an object between the drive roller and the belt, which increases friction and causes braking. This solution has certain risks. The sudden increase in resistance may cause the belt to break. In addition, even if it does not break, the belt will become increasingly loose due to overstretching, which is also not conducive to the long-term safe operation of the belt conveyor. Utility Model Content

[0007] The purpose of this utility model is to provide a sawtooth cam type belt backstop, which overcomes the shortcomings of the existing technology and solves the problem that the roller backstop is ineffective when the belt conveyor stops due to a malfunction, resulting in material backflow and affecting production efficiency. The sawtooth surface of the cam increases the friction of the return belt, reduces excessive belt stretching, and ensures safe production.

[0008] To achieve the above objectives, this utility model employs the following technical solution:

[0009] A sawtooth cam type belt backstop includes a cam, a wheel axle, and retaining rings. The two ends of the wheel axle are fixedly connected to the frame of the belt conveyor. The wheel axle is connected to two or more cams via keys. Retaining rings are provided on both sides of the cams. A spring retaining ring is provided on the wheel axle outside the retaining rings. There is a gap between the key and the cam. The cam is in a movable state within a 15° range. After the cam is installed, the distance between the upper edge of the cam and the bottom of the belt is no more than 1 mm.

[0010] Furthermore, the key is any one of a single flat key, a double flat key, or a spline.

[0011] Furthermore, the base circle radius of the cam is R1, which is 150-180mm, the maximum radius is R2, which is 180-210mm, and the maximum arc of the cam edge is π / 4.

[0012] Furthermore, the cam surface is provided with patterns to increase friction.

[0013] Furthermore, the pattern can be any one of serrated, grid-shaped, or protruding dotted patterns.

[0014] Furthermore, the sawtooth shape includes any one of rectangular teeth, triangular teeth, or trapezoidal teeth, the length direction of the teeth is perpendicular to the direction of belt movement, and the surface of the teeth is smooth and burr-free.

[0015] Furthermore, the cam is provided with a weight reduction hole.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] 1) This device can be used simultaneously with the roller backstop without affecting the normal function of the roller backstop. As an upgrade solution for preventing material backflow in belt conveyors, it can further increase the friction between the backstop and the belt, enhance the resistance to prevent belt reversal, achieve smooth backstop, reduce accident handling time, and improve production efficiency.

[0018] 2) The resistance value of this device to the belt is related to the slack of the belt, which can avoid the risk of belt breakage caused by excessive sudden external force, effectively extending the belt's lifespan. At the same time, it is inexpensive and easy to manufacture.

[0019] 3) Multiple units of this device can be installed at the bottom of the belt conveyor as needed, without affecting the normal operation of the belt, which helps to ensure the long-term safe operation of the belt conveyor. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model;

[0021] Figure 2 This is a schematic diagram of the cam unit structure in an embodiment of this utility model;

[0022] Figure 3 This is a schematic diagram of the cam and wheel axle mounting structure in an embodiment of this utility model.

[0023] In the diagram: 1-cam, 2-axle, 3-retaining ring, 4-belt conveyor frame, 5-key, 6-spring retaining ring, 7-belt, 8-pattern, 9-weight reduction hole. Detailed Implementation

[0024] The technical solution of this utility model will be clearly and completely described below with reference to specific embodiments. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0025] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the specific embodiments used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the specific embodiments described below are some embodiments of this utility model. For those skilled in the art, other specific embodiments can be obtained based on these specific embodiments without creative effort.

[0026] The components of the present invention described and shown in the specific embodiments herein can be arranged and designed in numerous different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the specific embodiments is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention.

[0027] See Figure 1-3 This is a schematic diagram of an embodiment of the sawtooth cam type belt backstop of this utility model, including a cam 1, a wheel shaft 2, and a retaining ring 3. The two ends of the wheel shaft 2 are fixedly connected to the belt conveyor frame 4. The wheel shaft 2 is connected to two or more cams 1 through a key 5. The cam 1 is provided with retaining rings 3 on both sides. A spring retaining ring 6 is provided on the wheel shaft 2 outside the retaining ring 3. The retaining ring 3 plays a fixing role to prevent the cam 1 from moving axially along the wheel shaft 2. There is a gap between the key 5 and the cam 1, so that the cam 1 is in a movable state within a 15° range. The cam 1 is in different positions due to the movement of the belt 7. When moving forward, the top edge of the cam 1 is at the lowest angle. When the belt moves backward, the cam 1 swings with the belt 7, and its top edge rises, applying a reverse resistance to the bottom of the belt, thereby achieving the function of preventing the belt from moving backward.

[0028] Key 5 can be any one of a single flat key, a double flat key, or a spline. In this embodiment, a spline is selected because it has a larger working cross section and can provide greater force. Cam 1 is made of high-manganese steel with good wear resistance.

[0029] In this embodiment, the diameter of the axle 2 is 50 mm. The base circle radius of the cam 1 is R1, which is 150-180 mm, and the maximum radius R2 is 180-210 mm. The maximum arc of the cam 1 edge is π / 4. The surface of the cam 1 is provided with a pattern 8 to increase friction. The pattern 8 can be any one of serrated, grid-shaped, or protruding dotted shapes.

[0030] The serrated teeth include any of the rectangular, triangular, or trapezoidal shapes. The length direction of the teeth is perpendicular to the direction of movement of the belt 7. The surface of the teeth is smooth and burr-free to avoid scratching the belt. The serrated pattern can enhance the ability to prevent the belt from spinning backward by increasing surface friction. The cam 1 is provided with a weight-reducing hole 9, making the cam 1 lighter and more flexible in operation.

[0031] After cam 1 is installed, the distance between the upper edge of cam 1 and the bottom of belt 7 is no more than 1mm. At this time, the belt moves in the normal direction and does not contact or only slightly contacts cam 1. When the belt reverses with material, the bottom return section of belt 7 loses power and falls downward onto the rim of the cam. Figure 2 As shown by the double-dotted line, the belt 7 drags the cam 1 to rotate 15° in the reverse direction. At this time, the top of the cam 1 rises by 30mm, the contact length with the belt increases, and the cam rubs against the belt, which acts as a brake on the reverse movement of the belt.

[0032] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A sawtooth cam type belt check, characterized by, The application relates to a belt conveyor, which comprises a cam, an axle and a stop ring, two ends of the axle are fixedly connected with a belt conveyor frame, more than two cams are connected with the axle through keys, the two sides of the cam are provided with the stop ring, and a spring stop ring is arranged on the axle outside the stop ring; the key and the cam have a gap, so that the cam is in a movable state within a range of 15 DEG; the upper edge of the cam is spaced apart from the bottom of the belt by not more than 1mm after the cam is installed.

2. A sawtooth cam-type belt check according to claim 1, wherein The key is any one of a single flat key, a double flat key and a spline.

3. A sawtooth cam-type belt check as defined in claim 1 wherein, The base circle radius of the cam is R1, which is 150-180mm, the maximum radius R2 is 180-210mm, and the maximum arc of the cam edge is pi / 4.

4. A sawtooth cam-type belt check as defined in claim 1 wherein, The surface of the cam is provided with a pattern for increasing friction.

5. A sawtooth cam-type belt check as defined in claim 4 wherein, The pattern is any one of a sawtooth shape, a grid shape or a protruding dot shape.

6. A sawtooth cam-type belt check as defined in claim 5 wherein, The sawtooth shape comprises any one of a rectangular tooth, a triangular tooth or a trapezoidal tooth, the length direction of the tooth is perpendicular to the moving direction of the belt, and the tooth surface is smooth without burrs.

7. A sawtooth cam-type belt check as defined in claim 1 wherein, The cam is provided with a weight-reducing hole.

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