Roller rolling force adjusting device of double-roller sand making machine

Abstract

A roller rolling force adjusting device of a double-roller sand making machine comprises a hydraulic cylinder, the hydraulic cylinder is provided with a flange plate of an integrated structure, the upper side face of the flange plate is fixedly connected with a tubular spring box body through a bolt, a plunger rod is arranged in the hydraulic cylinder, the plunger rod and the spring box body are each provided with a clamping groove, and spring inserting pieces are installed in the two clamping grooves in a matched mode. The two ends of the upper side face of each spring inserting piece abut against and extend out of the flange plate, the middle of the lower side face of each spring inserting piece abuts against a first spring seat, and the two ends of each spring inserting piece extend out of the spring box body. The spring ejector rod comprises a central ejector rod and an integrally formed flange. Through the spring inserting piece in the spring box body, oil pressure of hydraulic oil in the hydraulic cylinder is converted into pretightening force of the spring, so that the hydraulic cylinder can work when the oil pressure in the hydraulic cylinder is in a zero pressure state after the rolling force of a roller is adjusted, and the service life of the hydraulic cylinder is prolonged.

Description

Technical Field

[0001] This utility model relates to the technical field of sand making machines, and in particular to a roller pressure adjustment device for a double roller sand making machine. Background Technology

[0002] In the field of sand making machines, the double-roll crusher is a widely used piece of equipment. It uses two opposing rotating rollers to squeeze and crush materials, thereby achieving the purpose of sand making. Traditional double-roll crushers typically require a hydraulic cylinder to continuously provide pressure when adjusting the distance between the rollers, which affects the service life of the hydraulic cylinder and results in high maintenance costs. To solve these problems, how to maintain the adjustable distance between the rollers while simultaneously improving the service life of the hydraulic cylinder has become a research focus for those skilled in the art. Utility Model Content

[0003] This invention provides a roller pressure adjustment device for a double-roll sand making machine that is simple to operate and has a long service life.

[0004] A roller crushing pressure adjustment device for a double-roll crusher includes a hydraulic cylinder. The hydraulic cylinder has an integral flange. The upper side of the flange is fixedly connected to a tubular spring box by bolts. The hydraulic cylinder has a plunger rod. Both the plunger rod and the spring box have slots. Spring inserts are installed in the two slots. The number of spring inserts controls the preload of the spring. The upper side of the spring inserts abuts and extends out of the flange at both ends. The lower side of the spring inserts abuts the middle of a first spring seat and extends out of the spring box at both ends. The first spring seat is connected to one end of the spring, and the other end of the spring is connected to a spring top rod. The spring top rod includes a central top rod and an integrally formed flange. The central top rod extends out of a circular hole located on the bottom plate of the spring box, and the flange fits and connects to the bottom plate of the spring box. This invention alters the hydraulic pressure within the hydraulic cylinder at startup, causing the plunger rod to move downwards. The grooves on the plunger rod press against a corresponding number of spring inserts, allowing the spring push rod to apply spring force to the rollers of the double-roll crusher. When the hydraulic cylinder stops working, the hydraulic oil within it automatically returns to its original position due to the spring's preload combined with its elasticity. At this point, the spring's preload can directly act on the hydraulic cylinder's flange, allowing the hydraulic oil within the cylinder to be unloaded to zero pressure, thus extending the cylinder's service life. Furthermore, by changing the number of spring inserts, different preloads are provided, altering the roller spacing and thus meeting the needs of the double-roll crusher for crushing different materials.

[0005] The hydraulic cylinder is equipped with a hydraulic cylinder cover, which has a sealing ring, and an oil inlet / outlet port on the upper side of the hydraulic cylinder cover. When hydraulic oil enters or exits through the oil inlet / outlet port, the extension or retraction of the plunger rod can be controlled, thereby adjusting the distance between the rollers.

[0006] The flange has an annular groove on its inner circumference, and a guide ring is provided in the annular groove. The guide ring cooperates with the plunger rod. The guide ring further stabilizes the direction of the plunger rod's movement and prevents the plunger rod from deviating or shaking during movement.

[0007] The spring box is welded to the frame of the roller sand making machine.

[0008] This invention uses inserted spring inserts to convert the hydraulic oil pressure in the hydraulic cylinder into the preload of the spring inserts. This allows the hydraulic cylinder to operate when the oil pressure is at zero after the roller crushing pressure is adjusted, thus extending the service life of the hydraulic cylinder. Furthermore, by changing the number of spring inserts, different preloads are provided, which also meets the needs of the double-roll crusher for crushing different materials. Attached Figure Description

[0009] The present invention will be further described below with reference to the accompanying drawings:

[0010] Figure 1 This is a cross-sectional structural schematic diagram of a roller grinding pressure adjustment device for a double-roll sand making machine according to the present invention;

[0011] Figure 2 This is a schematic cross-sectional view of the installation structure of the roller grinding pressure adjustment device for a double-roll sand making machine according to this utility model;

[0012] Figure 3 This is a top view schematic diagram of the roller pressure adjustment device for a double-roll sand making machine according to this utility model. Detailed Implementation

[0013] The following is in conjunction with the appendix Figure 1-3 The specific implementation method further illustrates the technical solution of this patent.

[0014] A roller crushing pressure adjustment device for a double-roll crusher includes a hydraulic cylinder 3, a hydraulic cylinder cover 1, an oil inlet / outlet 5, and an integral flange 4. A tubular spring box 12 is bolted to the upper side of the flange 4. A plunger rod 2 is located inside the hydraulic cylinder 3. Both the plunger rod 2 and the spring box 12 have slots. Spring inserts 8 are fitted into the two slots. The number of spring inserts 8 controls the preload of the spring. The upper side 6 of the spring inserts abuts and extends out of the flange 4 at both ends. The lower side 7 of the spring inserts abuts a first spring seat 9 in the middle and extends out of the spring box 6 at both ends. The first spring seat 9 connects to one end of a spring 10, and the other end of the spring 10 connects to a spring top rod. The spring top rod includes a central top rod 14 and an integrally formed flange 13. The central top rod 14 extends out of a circular hole located on the bottom plate 16 of the spring box, and the flange 13 fits and connects to the bottom plate 16 of the spring box.

[0015] To further improve the motion stability of the plunger rod, an annular groove is provided on the inner circumference of the flange 4, and a guide ring 11 is provided in the annular groove. The guide ring 11 is used to connect the plunger rod 2.

[0016] The spring box 12 is welded to the frame 15 of the double roller sand making machine.

[0017] The specific working process of this utility model is as follows:

[0018] When hydraulic cylinder 3 receives a work command, hydraulic oil enters hydraulic cylinder 3 through inlet / outlet 5, pushing piston rod 2 to move. As piston rod 2 moves, the first spring seat 9 connected to piston rod 2 pushes spring push rod to move, which adjusts the position of the roller connected to the center push rod 14 of spring push rod, thereby realizing the gap between the two rollers, that is, the adjustment of the crushing pressure between the two rollers. After the adjustment is completed, spring insert 8 fills the slot as required, and then the hydraulic oil unloads the pressure, so that hydraulic cylinder 3 is in a zero-pressure state, that is, the working state of the rollers of the entire double roller sand making machine. Hydraulic cylinder 3 does not need to maintain pressure, which greatly extends the service life of the equipment.

[0019] The preferred embodiments of this patent have been described in detail above. However, this patent is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this patent.

Claims

1. A roller crushing pressure adjustment device for a double-roll crusher, comprising a hydraulic cylinder (3), wherein the hydraulic cylinder (3) is provided with an integral flange (4), and the upper side of the flange (4) is fixedly connected to a tubular spring box (12) by bolts, and a plunger rod (2) is provided inside the hydraulic cylinder (3), characterized in that: Both the plunger rod (2) and the spring box (12) are provided with slots. Spring inserts (8) are installed in the two slots. The number of spring inserts (8) controls the preload of the spring. The upper side (6) of the spring insert is abutted and extends out of the flange (4) at both ends. The lower side (7) of the spring insert is abutted in the middle of the first spring seat (9) and extends out of the spring box (12) at both ends. The first spring seat (9) is connected to one end of the spring (10). The other end of the spring (10) is connected to the spring top rod. The spring top rod includes a central top rod (14) and an integrally formed flange (13). The central top rod (14) extends out of the round hole located on the bottom plate (16) of the spring box. The flange (13) fits and connects to the bottom plate (16) of the spring box.

2. The roller pressure adjustment device for a double-roll sand making machine according to claim 1, characterized in that: The hydraulic cylinder (3) is provided with a hydraulic cylinder cover (1), and the upper side of the hydraulic cylinder cover (1) is provided with an oil inlet and outlet port (5).

3. The roller pressure adjustment device for a double-roll sand making machine according to claim 1, characterized in that: The flange (4) has an annular groove on its inner circumference, and a guide ring (11) is installed in the annular groove. The guide ring (11) is used to connect the plunger rod (2).

4. The roller pressure adjustment device for a double-roll sand making machine according to claim 1, characterized in that: The spring box (12) is welded to the frame (15) of the roller sand making machine.

Images