High-frequency hydraulic sand vibrating machine of large sand-core-containing forming fan and control method of high-frequency hydraulic sand vibrating machine

Abstract

The invention relates to the technical field of hydraulic sand vibration machines, in particular to a large high-frequency hydraulic sand vibration machine with a sand core forming fan and a control method thereof.The large high-frequency hydraulic sand vibration machine comprises a machine frame, a control box is arranged beside the machine frame, a man-machine interface is arranged on the control box, and a cross beam is welded to the back of the machine frame; a vibration structure and a hammering structure are installed on the cross beam, and a tool structure is installed on the machine frame through a buffering structure. Logic signals output by the PLC and the solid-state relay are converted into digital signals through a time control logic program to accurately control the reversing frequency of the electro-hydraulic servo valve, the electro-hydraulic servo valve is connected with the hydraulic hammer and the vibration cylinder through an oil pipe, the reversing frequency of the servo valve determines the telescopic frequency of the hydraulic cylinder, and in the sand vibration process, the hydraulic hammer and the vibration cylinder are driven to rotate. The hammering and sand vibrating frequency and the stroke of the hydraulic hammer can be directly and digitally controlled on a human-computer interface; in cooperation with the application of a solid-state relay, the high-frequency sand vibrating device can perform high-frequency sand vibrating action of more than 30Hz in a long service life.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic sand vibrating machines, in particular to a high-frequency hydraulic sand vibrating machine for a large sand core forming fan and a control method thereof. Background Art

[0002] Large sand core molding fans require more sand cores due to their complex shapes. After casting, the sand cores between the blades need to be cleaned. Currently, most vibrating sand machines on the market use a pneumatic hammer plus a vibrating motor structure. Due to the limitations of their equipment structure and working principle, the hammer frequency and vibration frequency cannot be intuitively and accurately set digitally, and the vibrating sand effect is unstable.

[0003] The current method for cleaning sand from large fans containing sand cores is to use a traditional sand vibrator, which combines a pneumatic hammer with a vibrating motor. This system operates by controlling the air pressure output to vary the hammer's striking frequency. This results in a low striking frequency and a narrow adjustable range of only approximately 1000 to 1500 beats / min. The vibration frequency, in turn, is determined by the motor speed, which is approximately 1500 rpm, making it relatively low and non-adjustable. Therefore, if sand cores remain after sand vibrating, the vibrating effect is unsatisfactory, or if vibrating for a different workpiece requires replacement, direct digital input of the hammer striking frequency, vibration frequency, and hammer stroke is not possible, making it impossible to meet process requirements. Summary of the Invention

[0004] In view of the problems in the prior art, the present invention provides a high-frequency hydraulic sand vibrating machine for a large sand core forming fan and a control method thereof.

[0005] The technical solution adopted by the present invention to solve its technical problems is: a high-frequency hydraulic sand vibrating machine for a large sand core forming fan, comprising a frame, a control box placed next to the frame, a human-machine interface provided on the control box, a crossbeam welded to the back of the frame, a vibration structure and a hammer structure installed on the crossbeam, and a tooling structure installed on the frame through a buffer structure.

[0006] Specifically, the buffer structure includes a base plate, a base plate is installed at the four corners of the top of the frame, an elastic member is installed at the top of the base plate, a mounting plate is installed at the top of the elastic member, a screw is slidably connected through the four corners of the mounting plate and the base plate, and nuts are threadedly connected at the upper and lower ends of the screw.

[0007] Specifically, the tooling structure includes a bracket, on which four columns are fixedly connected in a rectangular array, and arc-shaped clamps are fixedly connected to the top ends of the four columns.

[0008] Specifically, the vibration structure includes a first mounting seat, the first mounting seat is detachably mounted on the beam, a vibration hydraulic cylinder is detachably mounted on the first mounting seat, and a vibration disk is mounted on the output end of the vibration hydraulic cylinder.

[0009] Specifically, the hammering structure includes a second mounting seat, which is detachably mounted on the crossbeam, a hammering hydraulic cylinder is mounted on the second mounting seat, a fixed block is fixedly connected to the bottom end of the second mounting seat, a rotating block is rotatably connected to the bottom end of the fixed block, a hammering rod is rotatably connected to the other end of the rotating block, a connecting seat is mounted on the output end of the hammering hydraulic cylinder, and the connecting seat is rotatably connected to the hammering rod.

[0010] Specifically, the hammering structure further includes a hammering head, which is fixedly connected to the end of the hammering rod in a vertical relationship.

[0011] Specifically, the hammer head is made of rubber material.

[0012] A control method for a large-scale high-frequency hydraulic sand vibrating machine containing a sand core forming fan comprises the following steps: S1: First, clamp the casting on the tooling structure; S2: Set the initial parameters on the human-machine interface: hammering frequency and time, vibration frequency and time, hammer head running distance, etc., and press the manual start button; S3: The program controls the hammering mechanism to hammer at the appropriate position of the casting for tens of seconds. Under the action of high-frequency hammering force, the sand core is broken into several or even dozens of pieces and separated from the inner wall of the casting. At the same time, part of the outer sand core will fall off. S4: The program controls the stopping of hammering and the activation of the vibration mechanism. The servo valve controls the vibration hydraulic cylinder to drive the vibration plate to perform high-frequency up and down reciprocating motion, forming high-frequency vibration of the casting. The sand core blocks and the sand core blocks and the inner wall of the casting collide and rub against each other, and the sand grains on the surface of the sand core blocks gradually fall off and flow out of the cavity through the gaps. S5: During the sand vibration process or after the sand vibration is completed, various parameters can be adjusted on the human-machine interface at any time. After the sand vibration effect reaches the ideal state, the cycle operation mode is started and the mass production state is entered.

[0013] The beneficial effects of the present invention are: The logic signals output by the PLC and solid-state relay are converted into digital signals through a time-controlled logic program to precisely control the switching frequency of the electro-hydraulic servo valve. The electro-hydraulic servo valve is connected to the hydraulic hammer and vibrating cylinder by an oil pipe. The switching frequency of the servo valve determines the expansion and contraction frequency of the hydraulic cylinder, achieving the purpose of directly digitally controlling the hammering and vibration frequency and the hydraulic hammer stroke on the human-machine interface during the sand vibration process. In combination with the application of solid-state relays, the present invention can perform high-frequency sand vibration of more than 30Hz for a long life. Compared with traditional sand vibration machines that vaguely select the sand vibration frequency by setting the air pressure, the present invention can directly set the hammering and vibration frequency values ​​on the human-machine interface and can achieve high-frequency sand vibration, which is more intuitive, more accurate, and more efficient. At the same time, the multi-stroke setting of the hydraulic hammer can be compatible with a wider range of fan products of different sizes, allowing one machine to be used for multiple purposes and saving equipment costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present invention will be further described below with reference to the accompanying drawings and examples.

[0015] Figure 1 A schematic diagram of the overall structure provided by the present invention; Figure 2 It is a schematic diagram of the connection structure of the frame and the tooling structure of the present invention; Figure 3 It is a structural schematic diagram of the vibration structure of the present invention; Figure 4 It is a structural schematic diagram of the hammer structure of the present invention; Figure 5 for Figure 2 An enlarged schematic diagram of the structure of section A is shown; Figure 6 This is a diagram of the human-machine interface of the present invention; Figure 7 It is a logic control flow chart of the present invention; Figure 8 The communication port and IP circuit diagram of the present invention; Figure 9 This is the main loop circuit diagram of the present invention; Figure 10 It is the PLC input circuit diagram of the present invention; Figure 11 This is the PLC output circuit diagram of the present invention.

[0016] In the figure: 1. Frame; 2. Control box; 3. Human-machine interface; 4. Crossbeam; 5. Buffer structure; 501. Base plate; 502. Mounting plate; 503. Elastic member; 504. Screw; 6. Tooling structure; 601. Bracket; 602. Column; 603. Clamp; 7. Vibration structure; 701. Vibration disk; 702. Vibration hydraulic cylinder; 703. First mounting seat; 8. Hammering structure; 801. Second mounting seat; 802. Hammering hydraulic cylinder; 803. Fixed block; 804. Rotating block; 805. Hammering rod; 806. Connecting seat; 807. Hammering head. DETAILED DESCRIPTION

[0017] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0018] like Figure 1-Figure 5 As shown, the high-frequency hydraulic sand vibrating machine for a large sand core forming fan described in the present invention includes a frame 1, a control box 2 is placed next to the frame 1, a human-machine interface 3 is provided on the control box 2, a crossbeam 4 is welded to the back of the frame 1, a vibration structure 7 and a hammer structure 8 are installed on the crossbeam 4, and a tooling structure 6 is installed on the frame 1 through a buffer structure 5.

[0019] Specifically, the buffer structure 5 includes a base plate 501, and a base plate 501 is installed at the four corners of the top of the frame 1 respectively. An elastic member 503 is installed at the top of the base plate 501, and a mounting plate 502 is installed at the top of the elastic member 503. A screw 504 is slidably connected through the four corners of the mounting plate 502 and the base plate 501, and nuts are threaded at the upper and lower ends of the screw 504.

[0020] Specifically, the tooling structure 6 includes a bracket 601 , on which four columns 602 are fixedly connected in a rectangular array, and arc-shaped clamps 603 are fixedly connected to the top ends of the four columns 602 .

[0021] Specifically, the vibration structure 7 includes a first mounting seat 703 , which is detachably mounted on the beam 4 , a vibration hydraulic cylinder 702 is detachably mounted on the first mounting seat 703 , and a vibration disk 701 is mounted on the output end of the vibration hydraulic cylinder 702 .

[0022] Specifically, the hammering structure 8 includes a second mounting seat 801, which is detachably mounted on the crossbeam 4, and a hammering hydraulic cylinder 802 is mounted on the second mounting seat 801. A fixed block 803 is fixedly connected to the bottom end of the second mounting seat 801, and a rotating block 804 is rotatably connected to the bottom end of the fixed block 803. A hammering rod 805 is rotatably connected to the other end of the rotating block 804. A connecting seat 806 is mounted on the output end of the hammering hydraulic cylinder 802, and the connecting seat 806 is rotatably connected to the hammering rod 805. The hammering structure 8 also includes a hammering head 807, which is fixedly connected to the end of the hammering rod 805 in a vertical relationship, and the hammering head 807 is made of rubber material.

[0023] A control method for a large-scale high-frequency hydraulic sand vibrating machine containing a sand core forming fan comprises the following steps: S1: First, clamp the casting on the tooling structure 6; S2: Set the initial parameters on the human-machine interface 3: hammering frequency and time, vibration frequency and time, hammer head running distance, etc., and press the manual start button; S3: The program controls the hammering mechanism 8 to hammer at the appropriate position of the casting for tens of seconds. Under the action of the high-frequency hammering force, the sand core is broken into several or even dozens of pieces and separated from the inner wall of the casting, and at the same time, part of the outer sand core falls off; S4: The program controls the stopping of hammering and the activation of the vibration mechanism 7. The servo valve controls the vibration hydraulic cylinder 702 to drive the vibration plate 701 to perform high-frequency up and down reciprocating motion, thereby generating high-frequency vibration of the casting. The sand core blocks and the sand core blocks and the inner wall of the casting collide and rub against each other, causing the sand grains on the surface of the sand core blocks to gradually fall off and flow out of the mold cavity through the gaps. S5: During the sand vibration process or after the sand vibration is completed, various parameters can be adjusted on the human-machine interface 3 at any time. After the sand vibration effect reaches the ideal state, the cycle operation mode is started and the mass production state is entered.

[0024] When the present invention is in use, the casting is first clamped on the tooling structure 6, and the initial parameters are set on the human-machine interface 3: hammering frequency and time, vibration frequency and time, hammer head running distance, etc., and the manual start button is pressed. The program controls the hammering structure 8 to hammer at the appropriate position of the casting for tens of seconds. Under the action of the high-frequency hammering force, the sand core is broken into several or even dozens of pieces and separated from the inner wall of the casting. At the same time, part of the external sand core will fall off. The program controls to stop hammering and start the vibration structure 7. The servo valve controls the vibration hydraulic cylinder 702 to drive the vibration disk 701 to perform high-frequency up and down reciprocating motion, forming high-frequency vibration of the casting. The sand core blocks and the sand core blocks and the inner wall of the casting collide and rub against each other. The sand grains on the surface of the sand core blocks gradually fall off and flow out of the cavity from the gap. Various parameters can be adjusted on the human-machine interface 3 at any time during the sand vibration process or after the sand vibration is completed. After the sand vibration effect reaches the ideal state, the cycle operation mode is started and the mass production state is entered.

[0025] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates. In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A high-frequency hydraulic sand vibrating machine with a large sand core forming fan, comprising a frame (1), a control box (2) placed next to the frame (1), a human-machine interface (3) provided on the control box (2), and a crossbeam (4) welded to the back of the frame (1), characterized in that: A vibration structure (7) and a hammer structure (8) are installed on the crossbeam (4), and a tooling structure (6) is installed on the frame (1) via a buffer structure (5).

2. The high-frequency hydraulic sand vibrating machine for large-scale sand core forming fans according to claim 1, characterized in that: The buffer structure (5) comprises a base plate (501), one base plate (501) is respectively installed at the four corners of the top of the frame (1), an elastic member (503) is installed at the top of the base plate (501), a mounting plate (502) is installed at the top of the elastic member (503), a screw rod (504) is slidably connected through the four corners of the mounting plate (502) and the base plate (501), and nuts are threadedly connected at the upper and lower ends of the screw rod (504).

3. The high-frequency hydraulic sand vibrating machine for large-scale sand core forming fans according to claim 1, characterized in that: The tooling structure (6) comprises a bracket (601), on which four columns (602) are fixedly connected in a rectangular array relationship, and arc-shaped clamps (603) are fixedly connected to the top ends of the four columns (602).

4. The high-frequency hydraulic sand vibrating machine for large-scale sand core forming fans according to claim 1, characterized in that: The vibration structure (7) comprises a first mounting seat (703), the first mounting seat (703) being detachably mounted on the crossbeam (4), a vibration hydraulic cylinder (702) being detachably mounted on the first mounting seat (703), and a vibration disk (701) being mounted at the output end of the vibration hydraulic cylinder (702).

5. The high-frequency hydraulic sand vibrating machine for large-scale sand core forming fans according to claim 1, characterized in that: The hammering structure (8) comprises a second mounting seat (801), the second mounting seat (801) being detachably mounted on the crossbeam (4), a hammering hydraulic cylinder (802) being mounted on the second mounting seat (801), a fixed block (803) being fixedly connected to the bottom end of the second mounting seat (801), a rotating block (804) being rotatably connected to the bottom end of the fixed block (803), a hammering rod (805) being rotatably connected to the other end of the rotating block (804), a connecting seat (806) being mounted on the output end of the hammering hydraulic cylinder (802), and the connecting seat (806) being rotatably connected to the hammering rod (805).

6. The high-frequency hydraulic sand vibrating machine for large-scale sand core forming fans according to claim 5, characterized in that: The hammering structure (8) further comprises a hammering head (807), which is fixedly connected to the end of the hammering rod (805) in a vertical relationship.

7. The high-frequency hydraulic sand vibrating machine for large-scale sand core forming fans according to claim 6, characterized in that: The hammer head (807) is made of rubber material.

8. The control method of a high-frequency hydraulic sand vibrating machine for a large-scale sand core forming fan according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1: First, the casting is clamped on the tooling structure (6); S2: Set the initial parameters on the human-machine interface (3): hammering frequency and time, vibration frequency and time, hammer head running distance, etc., and press the manual start button; S3: The program-controlled hammering structure (8) hammers at the appropriate position of the casting for tens of seconds. Under the action of the high-frequency hammering force, the sand core is broken into several or even dozens of pieces and separated from the inner wall of the casting. At the same time, part of the outer sand core will fall off; S4: The program controls the stopping of hammering and the activation of the vibration structure (7). The servo valve controls the vibration hydraulic cylinder (702) to drive the vibration plate (701) to perform high-frequency up-and-down reciprocating motion, thereby generating high-frequency vibration of the casting. The sand core blocks and the sand core blocks and the inner wall of the casting collide and rub against each other, and the sand grains on the surface of the sand core blocks gradually fall off and flow out of the mold cavity through the gaps. S5: During the sand vibration process or after the sand vibration is completed, various parameters can be adjusted on the human-machine interface (3) at any time. After the sand vibration effect reaches the ideal state, the cycle operation mode is started and the mass production state is entered.

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