A hydraulic control system for a follow-up cylinder

Abstract

The utility model belongs to the technical field of supporting casting equipment, and particularly relates to a follower cylinder hydraulic control system, wherein the upper sand box and the lower sand box are opened and closed by the upper telescopic control of the fixed cylinder and the lower telescopic control of the driven cylinder. The utility model solves the problem of achieving the maximum opening between the upper sand box and the lower sand box under limited space in the prior art, and has the beneficial technical effects of increasing the upper and lower openings, saving the internal space of the molding machine, and increasing the lower core space during the operation of the molding machine.

Description

Technical Field

[0001] The utility model belongs to the technical field of matching casting equipment, and in particular relates to a hydraulic control system for a follower oil cylinder. Background Art

[0002] The common traditional single-station molding machine has a small sand box opening, which is not conducive to the production of lower cores. If the sand box is raised as a whole, the molding machine will be larger and the cost will increase. The existing technology has the problem of achieving the maximum opening between the upper sand box and the lower sand box under limited space. Summary of the invention

[0003] The utility model provides a follower cylinder hydraulic control system to solve the problem of realizing the maximum opening between an upper sand box and a lower sand box in a limited space in the prior art proposed in the background technology.

[0004] The technical problem solved by the utility model is achieved by adopting the following technical scheme: a follower cylinder hydraulic control system, comprising a system frame, a fixed cylinder is fixed on the inner side of the system frame, a slave cylinder is arranged on the outer side thereof, the slave cylinder is fixed on the cylinder rod of the fixed cylinder, an upper sand box is connected to the cylinder barrel of the slave cylinder, a lower sand box is connected to the cylinder rod of the slave cylinder, and the upper sand box and the lower sand box are opened and closed by the upper telescopic control of the fixed cylinder and the lower telescopic control of the slave cylinder.

[0005] Furthermore, the slave cylinder is telescopically connected to the lower sand box, and the telescopic space is limited by a limit switch.

[0006] Furthermore, the fixed oil cylinder and the driven oil cylinder are symmetrically distributed and connected to the corresponding two sides of the upper sand box and the lower sand box.

[0007] Further, the slave cylinder is started by the slave cylinder control valve and stopped by the first hydraulically controlled one-way valve.

[0008] Furthermore, the slave cylinder is placed in a free-falling state through the auxiliary valve and the second hydraulically controlled one-way valve.

[0009] Furthermore, the fixed oil cylinder is started and stopped by a fixed oil cylinder control valve.

[0010] Beneficial technical effects:

[0011] 1. This patent adopts a fixed oil cylinder fixed on the inner side of the system frame, and a driven oil cylinder is arranged on the outer side thereof, and the driven oil cylinder is fixed on the cylinder rod of the fixed oil cylinder, and the cylinder barrel of the driven oil cylinder is connected to the upper sand box, and the cylinder rod of the driven oil cylinder is connected to the lower sand box. The upper sand box and the lower sand box are opened and closed by the upper telescopic control of the fixed oil cylinder and the lower telescopic control of the driven oil cylinder. This scheme adopts a vertical follower oil cylinder control system, and the driven oil cylinder can move vertically freely. When the slave oil cylinder reaches the limit block, the slave oil cylinder can keep the sand box driven by the cylinder rod stationary under the drive of the fixed oil cylinder through this hydraulic system, and the cylinder can move up and down freely. Its specific working method is: when the fixed oil cylinder of the molding machine remains in an extended state, the upper sand box remains stationary, and the lower sand box is driven to rise and The upper and lower sand boxes are lowered to complete the closing and opening of the upper and lower sand boxes. When the lower sand box descends to the limit block, the lower sand box remains stationary, and the fixed cylinder lever drives the upper sand box to lift upward to complete the core setting work. The fixing relationship is: the fixed oil cylinder is fixed to the frame, the driven rod cylinder is fixed to the cylinder rod of the fixed oil cylinder, the upper sand box is fixed to the cylinder barrel of the driven oil cylinder, and the lower sand box is fixed to the cylinder rod of the driven oil cylinder; using this hydraulic system, the upper box of the single-station molding machine sand box can be lifted while the lower box remains stationary, which is convenient for on-site core setting work and meets the core setting distance of the molding machine during production. When the molding machine is working normally, the opening and closing actions of the sand box are controlled by the driven oil cylinder control valve, and the hydraulically controlled one-way valve ensures that the sand box can stop at any position, saving the internal space of the molding machine and increasing the core setting space during the working process of the molding machine.

[0012] 2. This patent adopts the slave cylinder to telescopically connect the lower sand box, and limits the telescopic space through the limit switch. Through the limit switch, the slave cylinder can move in the maximum space of its activity range and ensure the maximum opening between the upper sand box and the lower sand box.

[0013] 3. This patent adopts the fixed oil cylinder and the driven oil cylinder to be symmetrically distributed and connected to the corresponding two sides of the upper sand box and the lower sand box. The structures on both sides ensure the balance of the entire hydraulic control system.

[0014] 4. This patent adopts the slave cylinder to start through the slave cylinder control valve and stop through the first hydraulic control one-way valve. The slave cylinder is in a free-falling state through the auxiliary valve and the second hydraulic control one-way valve. The fixed cylinder is controlled to start and stop through the fixed cylinder control valve. Its working principle is as follows: when the molding machine is working normally, the opening and closing of the sand box is controlled by the slave cylinder control valve, and the hydraulic control one-way valve ensures that the sand box can stop at any position; when the slave cylinder extends to the position switch (3-4mm away from the limit block), the auxiliary valve and the hydraulic control one-way valve control valve are energized, and the slave cylinder will fall freely to the limit block under the action of the sand box's own weight, and at the same time the fixed cylinder retracts, driving the slave cylinder barrel and the upper sand box to rise and fall freely, while the lower sand box remains stationary. This realizes the lifting of the upper box when the molding machine is working, which is convenient for the core lowering. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a structural schematic diagram of a hydraulic control system of a follower cylinder of the utility model;

[0016] Figure 2 The utility model discloses a gas circuit control diagram of a hydraulic control system of a follower oil cylinder. DETAILED DESCRIPTION

[0017] The utility model is further described below in conjunction with the accompanying drawings:

[0018] In the figure:

[0019] 1-system frame, 2-fixed oil cylinder, 3-driven oil cylinder, 4-upper sand box, 5-lower sand box;

[0020] V101- slave cylinder control valve; V102- first hydraulically controlled one-way valve; V103- auxiliary valve; V104- second hydraulically controlled one-way valve; V105- fixed cylinder control valve; V106- externally controlled hydraulically controlled one-way valve; Example

[0021] This embodiment: Figure 1 As shown, a follower cylinder hydraulic control system includes a system frame 1, a fixed cylinder 2 is fixed on the inner side of the system frame 1, and a slave cylinder 3 is arranged on the outer side thereof, the slave cylinder 3 is fixed on the cylinder rod of the fixed cylinder 2, an upper sand box 4 is connected to the cylinder barrel of the slave cylinder 3, and a lower sand box 5 is connected to the cylinder rod of the slave cylinder 3, and the upper sand box 4 and the lower sand box are opened and closed by the upper telescopic control of the fixed cylinder 2 and the lower telescopic control of the slave cylinder 3.

[0022] The slave cylinder 3 is telescopically connected to the lower sand box 5, and the telescopic space is limited by a limit switch.

[0023] The fixed oil cylinder 2 and the driven oil cylinder 3 are symmetrically distributed and connected to the corresponding two sides of the upper sand box 4 and the lower sand box.

[0024] like Figure 2 As shown, the slave cylinder 3 is started by the slave cylinder 3 control valve and stopped by the first hydraulically controlled one-way valve V102.

[0025] The slave cylinder 3 is placed in a free-falling state through the auxiliary valve V103 and the second hydraulically controlled one-way valve V104.

[0026] The fixed oil cylinder 2 is started and stopped by the fixed oil cylinder 2 control valve.

[0027] Working principle:

[0028] The invention relates to a hydraulic cylinder which is fixed on the inner side of the system frame and a slave cylinder which is arranged on the outer side thereof. The slave cylinder is fixed on the cylinder rod of the fixed cylinder. The cylinder barrel of the slave cylinder is connected to an upper sand box, and the cylinder rod of the slave cylinder is connected to a lower sand box. The upper sand box and the lower sand box are opened and closed by the upper extension and contraction control of the fixed cylinder and the lower extension and contraction control of the slave cylinder. The hydraulic system is used to realize that the slave cylinder keeps the sand box driven by the cylinder rod stationary under the drive of the fixed cylinder, and the cylinder tube moves up and down freely. The specific working method is as follows: when the fixed cylinder of the molding machine is kept in an extended state, the upper sand box is kept stationary, and the lower sand box is driven to rise and fall by the slave cylinder lever to complete the closing and opening of the upper and lower sand boxes. When the lower sand box drops to the limit block, The upper and lower sand boxes are fixed to the upper and lower frames, and the lower and upper frames are fixed to the upper and lower frames respectively.

[0029] Utilizing the technical solution of the utility model, or those skilled in the art designing similar technical solutions inspired by the technical solution of the utility model to achieve the above-mentioned technical effects, all fall within the protection scope of the utility model.

Claims

1. A hydraulic control system for a follower cylinder, characterized in that: The invention comprises a system frame, wherein a fixed oil cylinder is fixed on the inner side of the system frame, and a driven oil cylinder is arranged on the outer side thereof; the driven oil cylinder is fixed on the cylinder rod of the fixed oil cylinder; the cylinder barrel of the driven oil cylinder is connected to an upper sand box; the cylinder rod of the driven oil cylinder is connected to a lower sand box; the upper sand box and the lower sand box are opened and closed by the upper telescopic control of the fixed oil cylinder and the lower telescopic control of the driven oil cylinder.

2. A follower cylinder hydraulic control system according to claim 1, characterized in that: The slave oil cylinder is telescopically connected to the lower sand box, and the telescopic space is limited by a limit switch.

3. A hydraulic control system for a follower cylinder according to claim 1, characterized in that: The fixed oil cylinder and the driven oil cylinder are symmetrically distributed and connected to the corresponding two sides of the upper sand box and the lower sand box.

4. A follower cylinder hydraulic control system according to claim 1, characterized in that: The slave cylinder is started by the slave cylinder control valve and stopped by the first hydraulically controlled one-way valve.

5. The hydraulic control system of a follower cylinder according to claim 1, characterized in that: The slave cylinder is placed in a free-falling state through the auxiliary valve and the second hydraulically controlled one-way valve.

6. The hydraulic control system of a follower cylinder according to claim 1, characterized in that: The fixed oil cylinder is started and stopped by a fixed oil cylinder control valve.

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