Flexible belt pressing device without middle roller

Abstract

The flexible belt pressing device comprises a supporting frame arranged above a conveying belt in parallel, an auxiliary belt is laid on the upper end face of the conveying belt, and a plurality of flexible extrusion structures are arranged between the supporting frame and the auxiliary belt in the moving direction of the conveying belt. The upper end of each flexible extrusion structure is connected with the lower end of the supporting frame and abuts against the corresponding auxiliary belt. Each group of flexible extrusion structure comprises an elastic part connected with the supporting frame and a flexible part arranged at the lower end of the elastic part; the elastic part is used for making the flexible part abut against the upper end faces of the auxiliary belts with different fluctuating heights, and the flexible part is used for being tightly attached to the upper end faces of the auxiliary belts with different shapes. And meanwhile, when the height of the materials in the conveying belt changes, the device can enable the materials with different heights to smoothly pass through along with the fluctuation of the height of the materials.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of conveying belt transfer, in particular to a flexible pressing belt device without middle roller. BACKGROUND

[0002] In the operation process of high inclination angle belt conveyor, the conveying belt is prone to "floating belt" phenomenon (i.e. the conveying belt is separated from the roller) due to the change of tension in the bending and inclined section, and the conveying belt is also prone to deviation problem. In order to make the conveying belt move along the preset track, in the prior art, an auxiliary belt device is arranged above the conveying belt, the auxiliary belt device comprises a flexible auxiliary belt arranged above the conveying belt and a rigid middle roller arranged above the flexible auxiliary belt. In the transportation process, the material is arranged between the conveying belt and the auxiliary belt, and the middle roller abuts against the lower flexible auxiliary belt to make the flexible auxiliary belt and the conveying belt form a transportation material storage area, and at the same time, the flexible auxiliary belt and the conveying belt interact (for example, friction) to make the position of the conveying belt not easy to deviate; but the characteristic of the rigid middle roller that cannot be bent causes that it cannot be flexibly adapted to various installation environments and working conditions, for example, when the middle roller is arranged above the concave arc with small width, the contact area between the middle roller and the flexible auxiliary belt is small, which causes that the flexible auxiliary belt is accelerated to wear, and the rigid middle roller also increases the probability of jamming of the transportation material and the middle roller. SUMMARY

[0003] The purpose of the present application is to provide a flexible pressing belt device without middle roller, which can adapt to different forms of auxiliary belt operation, and at the same time, when the height of the material in the conveying belt changes, the device can follow the fluctuation of the height of the material to make the material of different heights pass smoothly.

[0004] The present application adopts the following technical solutions: A flexible pressing belt device without middle roller, comprising a support frame arranged in parallel above the conveying belt, an auxiliary belt laid on the upper end surface of the conveying belt, and a plurality of flexible extrusion structures arranged between the support frame and the auxiliary belt along the movement direction of the conveying belt, wherein the upper end of each group of flexible extrusion structures is connected with the support frame and abuts against the corresponding auxiliary belt at the lower end; each group of flexible extrusion structures comprises an elastic part connected with the support frame and a flexible part arranged at the lower end of the elastic part; the elastic part is used for abutting the flexible part against the upper end surface of the auxiliary belt with different fluctuation heights, and the flexible part is used for closely contacting the upper end surface of the auxiliary belt with different shapes.

[0005] Further, the support frame comprises front and rear support rails arranged in parallel, parallel guide rollers are arranged between the front and rear support rails, the left and right ends of the auxiliary belt pass through the front and rear guide rollers respectively until the auxiliary belt is connected at the head and tail to form a closed loop, a driving part is arranged at the left side of the support frame, the driving part drives the rotation of the guide roller at the front side of the support frame, and a tensioning part is arranged at the right end of the support frame, which is used for tensioning the auxiliary belt at the left side of the guide roller.

[0006] Further, the elastic part comprises front and rear support rods arranged above the flexible part, and a cross support rod arranged in parallel with the left side of the support rods, the support rods are fixedly arranged between the front and rear support rails, the middle part of the support rods is rotationally connected with an upper spring seat, the lower end of the upper spring seat is fixedly arranged with a support spring, the lower end of the support spring is fixedly arranged with a lower spring seat, and the lower end of the lower spring seat is hingedly connected with the flexible part; the cross support rod is rotationally arranged between the support rails, the front and rear ends of the cross support rod are fixedly connected with a front vertical support rod and a rear vertical support rod respectively, and the lower ends of the front and rear vertical support rods are hingedly connected with the flexible part on the left and right sides.

[0007] Further, the flexible part comprises a support block hingedly connected with the lower spring seat, a through slot is arranged in the middle part of the support block along the front and rear directions, a first balance shaft is fixedly arranged in the through slot along the left and right directions, and the first balance shaft is rotationally connected with a first balance bracket along the radial direction; the first balance bracket is symmetrically arranged along the front and rear directions with the axis line of the first balance shaft as the center line, two groups of second balance shafts parallel with the first balance shaft are symmetrically arranged at the front and rear ends of the first balance bracket, and a second balance bracket is rotationally connected with each group of second balance shafts along the radial direction; each group of second balance brackets is symmetrically arranged along the front and rear directions with the axis line of the corresponding second balance shaft as the center line, two groups of third balance shafts parallel with the second balance shaft are symmetrically arranged at the front and rear ends of each group of second balance brackets, and a third balance bracket is rotationally connected with each group of third balance shafts along the radial direction; each group of third balance brackets is symmetrically arranged along the front and rear directions with the axis line of the corresponding third balance shaft as the center line, and a balance roller is arranged in each group of third balance brackets along the front and rear directions; and each group of balance rollers is rotationally connected with the corresponding third balance bracket along the axial direction.

[0008] Further, the upper spring seat comprises an upper support plate rotationally connected with the support rod and a lower support plate slidingly connected with the upper support plate along the up and down directions, and the lower support plate is fixedly arranged with the upper end of the support spring; a compression amount adjusting part is arranged between the upper support plate and the lower support plate, and the compression amount adjusting part changes the compression amount of the support spring by driving the lower support plate to move and press the support spring.

[0009] Further, a group of slide rods is fixedly arranged at the front and rear ends of the upper support plate, each group of slide rods is slidingly arranged through the corresponding position of the lower support plate, a group of supports is fixedly arranged at the middle part of the slide rods on the left and right sides between the upper support plate and the lower support plate, an eccentric shaft is rotationally arranged between the two groups of supports, the middle part of the eccentric shaft is eccentrically fixedly arranged with a driving disc, and the upper and lower sides of the driving disc are tightly arranged with the upper support plate and the lower support plate respectively; an eccentric driving part is arranged on one side of the eccentric shaft, and the eccentric driving part is used for driving the eccentric shaft to rotate.

[0010] Further, the eccentric driving part comprises a connecting ring fixedly arranged with the eccentric shaft in a coaxial manner, and a counterweight is fixedly arranged at the lower end of the connecting ring. Furthermore, the tensioning part includes guide grooves that are both set at the right ends of the front and rear support rails. A slider is slidably arranged in each guide groove. A compression spring is set on the left side of each slider. The left and right ends of the compression spring are respectively fixed to the left side wall of the guide groove and the slider. A guide roller is rotatably connected between the front and rear sliders.

[0011] Furthermore, several sets of V-shaped rollers are installed below the conveyor belt. The V-shaped rollers are fixed to the inclined brackets installed on the ground, and the support frame is fixed to the inclined brackets by several sets of stabilizing rods.

[0012] Furthermore, the drive unit can be a drive motor.

[0013] I. This invention provides downward pressure on the auxiliary belt by setting the elastic spring of the elastic part to support the flexible part; at the same time, when the height of the material in the conveyor belt changes, the auxiliary belt presses upward on the flexible part, and the flexible part compresses the support spring to allow the material in the conveyor belt to pass smoothly; during the movement of the conveyor belt to the right, the conveyor belt applies a rightward reaction force to the flexible part through the auxiliary belt, and the front and rear vertical supports hinged to the flexible part provide a leftward pulling force to the flexible part, thereby improving the stability of the elastic part.

[0014] Second, by setting up a flexible part, the present invention allows the auxiliary belt, which is in close contact with the material, to have different shapes on the front and back sides of the upper end of the auxiliary belt when conveying different materials. The balance roller, which is set on the upper end of the auxiliary belt, rotates at different angles according to the shapes of the front and back sides of the upper end of the auxiliary belt, thereby adapting to the different shapes of the upper end of the auxiliary belt. This makes the contact area between the balance roller and the upper end of the auxiliary belt larger, making the material transportation more stable and the force on the surface of the balance roller and the auxiliary belt more uniform, reducing the wear rate and improving the service life of the auxiliary belt.

[0015] Third, by setting up a compression adjustment part, the present invention increases the downward movement distance of the support plate driven by the drive disc, that is, increases the compression of the support spring. The support spring can provide greater elastic force to press against the auxiliary belt, so that the material in contact with the middle of the auxiliary belt is squeezed and fixed. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the supporting frame in this invention; Figure 2 This is a schematic diagram of the inclined support structure in this invention; Figure 3 In this invention Figure 2 Enlarged diagram of A in the middle; Figure 4 In this invention Figure 2 Enlarged diagram of B in the diagram; Figure 5 This is a schematic diagram of the flexible part in the present invention; Figure 6 Figure is the structure diagram of the upper spring seat in the application; Figure 7 Figure is the structure diagram of the support rod in the application; Figure 8 Figure is the structure diagram of the eccentric shaft in the application; Figure 9 Figure is the structure diagram of the balance roller in the application.

[0017] In the figure, 1 is a support frame; 2 is a conveying belt; 3 is an auxiliary belt; 4 is a flexible extrusion structure; 5 is an elastic part; 6 is a flexible part; 7 is a support rail; 8 is a guide roller; 9 is a support rod; 10 is a cross brace; 11 is an upper spring seat; 12 is a support spring; 13 is a lower spring seat; 14 is a front vertical brace; 15 is a rear vertical brace; 16 is a support block; 17 is a first balance shaft; 18 is a first balance bracket; 19 is a second balance shaft; 20 is a second balance bracket; 21 is a third balance shaft; 22 is a third balance bracket; 23 is a balance roller; 24 is a support seat; 25 is an eccentric shaft; 26 is a driving disc; 27 is an upper support plate; 28 is a lower support plate; 29 is a sliding rod; 30 is a guide groove; 31 is a sliding block; 32 is a compression spring; 33 is a V-shaped roller; 34 is an inclined bracket; 35 is a stabilizing rod; 36 is a driving motor; and 37 is a counterweight. DETAILED DESCRIPTION

[0018] Please refer to Figures 1-9 The application will be described in detail below in combination with the drawings and examples: The flexible pressing belt device without intermediate rollers described in the application comprises a support frame 1 arranged in parallel above a conveying belt 2, the upper end surface of the conveying belt 2 is paved with an auxiliary belt 3, and a plurality of flexible extrusion structures 4 are arranged between the support frame 1 and the auxiliary belt 3 along the movement direction of the conveying belt 2, the upper end of each group of flexible extrusion structures 4 is connected to the support frame 1 and abuts against the corresponding auxiliary belt 3, each group of flexible extrusion structures 4 comprises an elastic part 5 connected to the support frame 1 and a flexible part 6 arranged at the lower end of the elastic part 5, when the conveying belt 2 conveys materials of different shapes, the auxiliary belt 3 closely attached to the upper end of the materials will have different heights and shapes, the elastic part 5 is used to make the flexible part 6 abut against the upper end surface of the auxiliary belt 3 with different undulating heights, and the flexible part 6 is used to closely attach to the upper end surface of the auxiliary belt 3 with different shapes.

[0019] In this embodiment, the support frame 1 comprises support rails 7 arranged in parallel in front and back, parallel guide rollers 8 are arranged between the two groups of support rails 7 in front and back, the left and right ends of the auxiliary belt 3 pass through the front and rear guide rollers 8 respectively until the auxiliary belt 3 is connected at the head and tail to form a closed loop, a driving part is arranged at the left side of the support frame 1, the driving part drives the front guide roller 8 of the support frame 1 to rotate, a tensioning part is arranged at the right end of the support frame 1, the tensioning part is used to tension the auxiliary belt 3 at the left guide roller 8, so that the auxiliary belt 3 closely abuts against the corresponding guide roller 8, and provides sufficient power for the left guide roller 8 to drive the auxiliary belt 3 to move.

[0020] In the present application, the elastic part 5 includes front and rear arranged support rods 9 arranged above the flexible part 6, and a cross brace 10 arranged in parallel on the left side of the support rod 9, the support rod 9 is fixedly arranged between the front and rear support rails 7, the middle of the support rod 9 is rotationally connected with an upper spring seat 11, the lower end of the upper spring seat 11 is fixedly provided with a supporting spring 12, the lower end of the supporting spring 12 is fixedly provided with a lower spring seat 13, and the lower end of the lower spring seat 13 is hingedly connected with the flexible part 6; the cross brace 10 is rotationally arranged between the support rails 7, the front and rear ends of the cross brace 10 are respectively fixedly connected with a front vertical brace 14 and a rear vertical brace 15, the lower ends of the front vertical brace 14 and the rear vertical brace 15 are respectively hingedly connected with the front and rear sides of the flexible part 6; in the working process, the supporting spring 12 is always in a compressed state; the elastic force of the supporting spring 12 provides the pressure of the flexible part 6 extruding the auxiliary belt 3 downward; at the same time, when the material height in the conveying belt 2 changes, the auxiliary belt 3 extrudes the flexible part 6 upward, and the flexible part 6 makes the material in the conveying belt 2 pass smoothly by compressing the supporting spring 12.

[0021] In the process of the conveying belt 2 moving to the right, the conveying belt 2 exerts a rightward reaction force on the flexible part 6 through the auxiliary belt 3, and the front vertical brace 14 and the rear vertical brace 15 hingedly connected with the flexible part 6 provide a leftward pulling force for the flexible part 6, thereby improving the stability of the elastic part 5.

[0022] Since the auxiliary belt 3 laid on the material of the conveying belt 2 will appear different postures (changed due to the change of the size and shape of the transported goods), in order to make the lower end of the flexible part 6 as close as possible to the upper end surface of the auxiliary belt 3, in the present application, the flexible part 6 includes a support block 16 hingedly connected with the lower spring seat 13, a through slot is formed in the middle of the support block 16 along the front and rear directions, a first balance shaft 17 is fixedly arranged in the through slot along the left and right directions, and a first balance bracket 18 is rotationally connected with the first balance shaft 17 along the radial direction; the first balance bracket 18 is symmetrically arranged front and rear with the first balance shaft 17 as the center line, two groups of second balance shafts 19 parallel to the first balance shaft 17 are symmetrically arranged at the front and rear ends of the first balance bracket 18, and a second balance bracket 20 is rotationally connected with each group of second balance shafts 19 along the radial direction; each group of second balance brackets 20 is symmetrically arranged front and rear with the corresponding second balance shaft 19 as the center line, two groups of third balance shafts 21 parallel to the second balance shaft 19 are symmetrically arranged at the front and rear ends of each group of second balance brackets 20, and a third balance bracket 22 is rotationally connected with each group of third balance shafts 21 along the radial direction; each group of third balance brackets 22 is symmetrically arranged front and rear with the corresponding third balance shaft 21 as the center line, and a balance roller 23 is arranged in each group of third balance brackets 22 along the front and rear directions, and each group of balance rollers 23 is rotationally connected with the corresponding third balance bracket 22 along the axial direction.

[0023] In the working process, when the conveying belt 2 conveys different materials, the upper end face of the auxiliary belt 3 close to the upper end of the material will have different shapes, and the balance roller 23 arranged on the upper end of the auxiliary belt 3 will rotate at different angles according to the shape of the upper end face of the auxiliary belt 3, so as to adapt to the upper end face of the auxiliary belt 3 with different shapes, make the contact area of the balance roller 23 and the upper end face of the auxiliary belt 3 larger, make the material transportation more stable, and the force of the balance roller 23 and the surface of the auxiliary belt 3 is uniform, the wear speed is reduced, and the service life of the auxiliary belt 3 is improved.

[0024] When the inclination angle of the conveying belt 2 becomes larger, the downward component force of the gravity acting on the material along the conveying belt 2 becomes larger, and the downward pressure of the flexible part 6 at the upper end of the material should be increased correspondingly, so that the auxiliary belt 3 at the lower end of the flexible part 6 is pressed to avoid the risk of material sliding downward. In order to solve this problem: In the present application, the upper spring seat 11 comprises an upper support plate 27 rotationally connected with the supporting rod 9 and a lower support plate 28 slidably connected with the upper support plate 27, and the lower support plate 28 is fixed with the upper end of the supporting spring 12; a compression amount adjusting part is arranged between the upper support plate 27 and the lower support plate 28, and the compression amount adjusting part changes the compression amount of the supporting spring 12 by driving the lower support plate 28 to extrude the supporting spring 12; In the present embodiment, a group of slide rods 29 are fixedly arranged on the front and rear of the upper support plate 27, each group of slide rods 29 is slidably arranged through the corresponding position of the lower support plate 28, a group of supports 24 are fixedly arranged in the middle of the slide rods 29 on the front and rear sides between the upper support plate 27 and the lower support plate 28, an eccentric shaft 25 is rotationally arranged between the front and rear groups of supports 24, the eccentric shaft 25 is eccentrically fixed with a driving disc 26 in the middle, and the driving disc 26 is tightly arranged on the upper and lower sides of the upper support plate 27 and the lower support plate 28; an eccentric driving part is arranged on one side of the eccentric shaft 25, and the eccentric driving part is used for driving the eccentric shaft 25 to rotate; In the working process, when the conveying belt 2 is arranged horizontally, the center of the driving disc 26 is directly above the axis of the eccentric shaft 25, the lower support plate 28 is directly below the axis of the eccentric shaft 25, and at this time, the axis of the eccentric shaft 25 is farthest away from the lower support plate 28, and the distance of the lower support plate 28 driven downward by the driving disc 26 is smallest, that is, the compression amount of the supporting spring 12 is smallest.

[0025] In the present embodiment, the eccentric driving part comprises a connecting ring coaxially fixed with the eccentric shaft 25, and a counterweight 37 is fixedly arranged at the lower end of the connecting ring; In the present application, the tensioning part comprises guide grooves 30 arranged on the right ends of the front and rear groups of supporting rails 7, slide blocks 31 are slidably arranged in each group of guide grooves 30, compression springs 32 are arranged on the left sides of each group of slide blocks 31, and the left and right ends of the compression springs 32 are fixedly connected with the left side walls of the guide grooves 30 and the slide blocks 31, respectively, and the front and rear slide blocks 31 are rotationally connected with the guide rollers 8.

[0026] The V-shaped rollers 33 are fixed to the inclined support 34 arranged on the ground, and the support frame 1 is fixed to the inclined support 34 through the stable rods 35.

[0027] In the embodiment, the driving part can adopt the driving motor 36.

[0028] During the working process, when the conveying belt 2 conveys the materials, the conveying belt 2 carrying the materials moves to the right, the auxiliary belt 3 is laid on the upper end of the materials, the support spring 12 arranged above the auxiliary belt 3 drives the support block 16 hinged to the lower spring seat 13, and the plurality of balance rollers 23 arranged at the front and rear ends of the support block 16 rotate according to the shape of the corresponding auxiliary belt 3, so as to adjust the posture to be in contact with the upper end of the corresponding auxiliary belt 3, and the plurality of balance rollers 23 are pressed downward by the upper support spring 12 to abut against the auxiliary belt 3, so that the materials in contact with the middle part of the auxiliary belt 3 are fixed by being pressed, the auxiliary belt 3 is tightly attached to the corresponding conveying belt 2 on both sides, so that the friction force is generated between the auxiliary belt 3 and the conveying belt 2, thereby keeping the auxiliary belt 3 moving in the set direction.

[0029] When the conveying belt 2 is in the horizontal position, the center of the driving disc 26 is directly above the axis of the eccentric shaft 25, the lower support plate 28 is directly below the axis of the eccentric shaft 25, and the distance between the axis of the eccentric shaft 25 and the lower support plate 28 is the smallest at this time, that is, the compression amount of the support spring 12 is the smallest.

[0030] The center of gravity of the counterweight 37 is directly below the axis of the eccentric shaft 25; With the increase of the inclination angle of the conveying belt 2, the counterweight 37 arranged on one side of the eccentric shaft 25 always keeps the center of gravity directly below the axis of the eccentric shaft 25 under the action of gravity, that is, the center of the driving disc 26 fixed by the eccentric shaft 25 and the counterweight 37 is always directly above the axis of the eccentric shaft 25; the lower support plate 28 connected to the sliding rod 29 is moved to one side of the driving disc 26 below the axis of the eccentric shaft 25, at this time, the distance of the driving disc 26 driving the lower support plate 28 to move downward is larger, that is, the compression amount of the support spring 12 is larger, and the support spring 12 can provide greater elastic force to abut against the auxiliary belt 3, so that the materials in contact with the middle part of the auxiliary belt 3 are fixed by being pressed.

[0031] In conclusion, the application sets special structure, when conveying material by the conveying belt, the flexible part makes the material in the conveying belt pass smoothly by compressing the supporting spring; the balance roller in the flexible part rotates different angles according to the shape of the front and back sides of the upper end face of the auxiliary belt, adapts to the upper end face of the auxiliary belt of different shapes, makes the contact area of the balance roller and the upper end face of the auxiliary belt larger, makes the material transportation more stable, the force of the balance roller and the surface of the auxiliary belt is uniform, the abrasion speed is reduced, and the service life of the auxiliary belt is improved; meanwhile, when the inclination angle of the conveying belt becomes larger, the driving disc drives the lower supporting plate to move downward by a larger distance by setting the compression amount adjusting part, that is, the compression amount of the supporting spring becomes larger, the supporting spring can provide larger elastic force to tightly press the auxiliary belt, and the material contacting the middle part of the auxiliary belt is fixed by extrusion.

Claims

1. A flexible belt pressing device without a center roller, characterized in that: The system includes a support frame arranged parallel above the conveyor belt, an auxiliary belt laid on the upper surface of the conveyor belt, and several flexible extrusion structures arranged between the support frame and the auxiliary belt along the direction of conveyor belt movement. The upper end of each flexible extrusion structure is connected to the lower end of the support frame and abuts against the corresponding auxiliary belt. Each flexible extrusion structure includes an elastic part connected to the support frame and a flexible part arranged at the lower end of the elastic part. The elastic part is used to make the flexible part abut against the upper surface of the auxiliary belt with different undulation heights, and the flexible part is used to fit tightly against the upper surface of the auxiliary belt with different shapes.

2. The flexible belt pressing device without a center roller according to claim 1, characterized in that: The support frame includes parallel support rails arranged front and rear, and parallel guide rollers are arranged between the two sets of support rails. The auxiliary belt passes around the front guide roller and the rear guide roller at its left and right ends respectively until the auxiliary belt is connected to form a closed loop. A drive unit is provided on the left side of the support frame, which drives the guide roller at the front of the support frame to rotate. A tensioning unit is provided on the right side of the support frame, which is used to tension the auxiliary belt at the guide roller on the left side.

3. The flexible belt pressing device without a center roller according to claim 2, characterized in that: The elastic part includes a support rod arranged at the front and rear above the flexible part and a cross brace arranged parallel to the left side of the support rod. The support rod is fixedly arranged between the front and rear support rails. An upper spring seat is rotatably connected to the middle of the support rod. A support spring is fixedly arranged at the lower end of the upper spring seat. A lower spring seat is fixed at the lower end of the support spring, and the lower end of the lower spring seat is hinged to the flexible part. The cross brace is rotatably arranged between the support rails. The front and rear ends of the cross brace are fixedly connected to the front vertical brace and the rear vertical brace, respectively. The lower ends of the front vertical brace and the rear vertical brace are hinged to the front and rear sides of the flexible part, respectively.

4. The flexible belt pressing device without a center roller according to claim 3, characterized in that: The flexible part includes a support block hinged to the lower spring seat. A through groove is formed in the middle of the support block along the front and back. A first balance shaft is fixedly arranged in the groove from left to right. The first balance shaft is rotatably connected to a first balance bracket in the radial direction. The first balance bracket is symmetrically arranged front and back with the axis of the first balance shaft as the center line. Two sets of second balance shafts parallel to the first balance shaft are symmetrically arranged at both ends of the first balance bracket. Each set of second balance shafts is rotatably connected to a second balance bracket in the radial direction. Each set of second balance brackets is symmetrically arranged front and back with the corresponding axis of the second balance shaft as the center line. Two sets of third balance shafts parallel to the second balance shaft are symmetrically arranged at both ends of the second balance bracket. Each set of third balance shafts is rotatably connected to a third balance bracket in the radial direction. Each set of third balance brackets is symmetrically arranged front and back with the corresponding axis of the third balance shaft as the center line. A balance roller is arranged along the front and back of each set of third balance brackets. Each set of balance rollers is rotatably connected to the corresponding third balance bracket in the axial direction.

5. The flexible belt pressing device without a center roller according to claim 3, characterized in that: The upper spring seat includes an upper support plate rotatably connected to the support rod and a lower support plate slidably connected to the upper support plate. The lower support plate is fixed to the upper end of the support spring. A compression adjustment part is provided between the upper support plate and the lower support plate. The compression adjustment part changes the compression of the support spring by driving the lower support plate to move and compress the support spring.

6. The flexible belt pressing device without a center roller according to claim 5, characterized in that: The upper support plate is fixedly provided with a set of sliding rods at both the front and rear. Each set of sliding rods slides through the corresponding position of the lower support plate. A set of supports is fixedly provided in the middle of the sliding rods on both the front and rear sides between the upper and lower support plates. An eccentric shaft is rotatably provided between the two sets of supports. A drive disk is eccentrically fixed in the middle of the eccentric shaft. The upper and lower sides of the drive disk are respectively in close contact with the upper and lower support plates. An eccentric drive part is provided on one side of the eccentric shaft, which is used to drive the eccentric shaft to rotate.

7. The flexible belt pressing device without a center roller according to claim 6, characterized in that: The eccentric drive unit includes a connecting ring fixed coaxially with the eccentric shaft, and a counterweight is fixedly disposed at the lower end of the connecting ring.

8. The flexible belt pressing device without a center roller according to claim 2, characterized in that: The tensioning part includes guide grooves that are both set at the right ends of the front and rear support rails. A slider is slidably arranged in each guide groove. A compression spring is set on the left side of each slider. The left and right ends of the compression spring are respectively fixed to the left side wall of the guide groove and the slider. A guide roller is rotatably connected between the front and rear sliders.

9. The flexible belt pressing device without a center roller according to claim 1, characterized in that: Several sets of V-shaped rollers are installed below the conveyor belt. The V-shaped rollers are fixed to the inclined brackets set on the ground. The support frame is fixed to the inclined brackets by several sets of stabilizing rods.

10. The flexible belt pressing device without a center roller according to claim 1, characterized in that: The drive unit can be a drive motor.

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