A jacking device for vacuum underpressure

Abstract

The utility model discloses a kind of jacking devices for vacuum negative pressure, it is related to the field of lost foam casting technology, including position frame, jacking cylinder is installed on position frame, jacking cylinder is vertically arranged;The output end of jacking cylinder is installed with connecting block, and the bottom of connecting block is provided with communicating port;Communicating port extends to the upper surface of connecting block;The diameter of the top of connecting block is less than the inner diameter of connecting hole opened in the bottom of sand box, and the diameter of bottom is greater than the inner diameter of connecting hole;Negative pressure hose is communicated in communicating port, and control ball valve is installed on negative pressure hose, for controlling the opening and closing of negative pressure hose, to solve the technical problem that lack of sand box bottom lifting forms negative pressure circuit and reduces vacuum connecting component and hose friction or interference.

Description

Technical Field

[0001] This utility model relates to the field of lost foam casting technology, specifically a lifting device for vacuum negative pressure. Background Technology

[0002] Some existing casting methods require vacuum extraction to create negative pressure, including lost foam casting and vacuum-sealed molding. Lost foam casting uses foam plastic to create a solid model that perfectly matches the shape of the casting. This model is then coated with a refractory coating, placed in a sand box for sanding, filling, and compaction, and then molten metal is poured directly into it. The high-temperature molten metal causes the foam model to rapidly vaporize, burn, and disappear, with the molten metal replacing the model. After cooling, the casting is formed.

[0003] Vacuum connection components are typically installed outside the sand box to achieve vacuum negative pressure extraction. For example, the sand box for negative pressure casting (CN200920036133.9) has a metal flexible hose installed on the side air extraction pipe interface to achieve vacuum extraction. Since the casting production line consists of multiple sets of sand boxes operating continuously, this structure requires the side installation of vacuum connection components, resulting in a relatively large overall structural width.

[0004] For example, CN201710367145.9 describes a vacuum casting device that facilitates crane lifting operations. The device has a vacuum suction hose installed on top, which is connected to the vacuum cavity. A vacuum pump evacuates the vacuum cavity through the vacuum suction hose.

[0005] Currently, there are also multi-layered sand boxes that use vacuum extraction ports to achieve vacuum negative pressure.

[0006] Currently, vacuum connection components have the following problems:

[0007] 1) Although there are currently methods to install vacuum connection components at the bottom of the sand box, such as inserting pipes into the sand box, there is a lack of precise and airtight vacuum connection components to connect the sand box.

[0008] 2) The negative pressure generating system generates negative pressure. The pipeline lifting needs to be installed using a flexible hose and connected to the vacuum connection component. If a hose is used for connection, there will be interference or friction between the hose and the cylinder.

[0009] To address these issues, we provide a lifting device for vacuum negative pressure. Utility Model Content

[0010] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a lifting device for vacuum negative pressure to solve the technical problem of lacking a sand box bottom lifting mechanism to form a negative pressure circuit and reduce friction or interference between vacuum connection components and hoses.

[0011] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a lifting device for vacuum negative pressure, including a position frame, a lifting cylinder mounted on the position frame, the lifting cylinder being vertically arranged; a connecting block is mounted on the output end of the lifting cylinder, and a communication port is provided at the bottom of the connecting block; the communication port extends to the upper surface of the connecting block.

[0012] The top diameter of the connecting block is smaller than the inner diameter of the connecting hole at the bottom of the sand box, and the bottom diameter is larger than the inner diameter of the connecting hole.

[0013] A negative pressure hose is connected to the connection port, and a control ball valve is installed on the negative pressure hose to control the opening and closing of the negative pressure hose.

[0014] In a further technical solution, a connecting port is installed at the bottom of the connecting port, and a bend connector is installed. The bend connector is "L" shaped and is connected to the negative pressure hose.

[0015] A retaining ring plate is installed on the cylinder body of the lifting cylinder, and a notch is provided on the upper part of the retaining ring plate; the size of the notch is larger than the piston rod diameter of the lifting cylinder and smaller than the outer diameter of the connecting block.

[0016] In a further technical solution, a transition recess is provided on the retaining ring plate, and the transition recess is located at the bottom of the bend joint; the transition recess is adapted to the bend joint.

[0017] In a further technical solution, the input end of the lifting cylinder is equipped with an air supply circuit and includes a solenoid valve, which controls the opening and closing of the lifting cylinder; the negative pressure hose is connected to an external negative pressure generating system.

[0018] In a further technical solution, an isolation mesh plate is installed inside the sand box, and the isolation mesh plate is located above the connection hole;

[0019] The connecting block includes an upper body and a central ring, which are coaxially arranged and integrally connected; the outer diameter of the upper body is smaller than the inner diameter of the connecting hole; the outer diameter of the central ring is larger than the inner diameter of the connecting hole.

[0020] In a further technical solution, a sealing ring is installed on the upper part of the central ring; an annular groove is provided at the bottom of the sand box outside the connecting hole, and the annular groove is adapted to the sealing ring.

[0021] In a further technical solution, a side stop bar is installed on the side of the retaining ring plate facing the negative pressure hose. One end of the side stop bar is detachably connected to the retaining ring plate, and the other end is provided with an opening. A ball bearing is provided in the opening and constrains the negative pressure hose to rise and fall with the connecting block within the opening.

[0022] The positioning frame is L-shaped and is detachably connected to the bottom of the lifting cylinder.

[0023] In a further technical solution, limit switches are installed on the position frame, and position baffles are fixedly installed at the bottom of the sand box;

[0024] The limit switch includes a bottom mounting block, a trigger switch is installed in the middle of the bottom mounting block and is set upwards, a hinge rod is installed on the bottom mounting block and a pressure plate is installed on the top of the hinge rod.

[0025] The pressure plate and the position baffle are in movable contact.

[0026] The pressure plate bends downwards on both sides, with the bottom edge lower than the bottom height of the position baffle and the top edge higher than the bottom height of the position baffle.

[0027] In a further technical solution, two sets of hinge rods are symmetrically arranged, and the top of the hinge rod is rotatably connected to the pressure plate; the bottom of the hinge rod is hinged to the bottom mounting block.

[0028] A return spring is also installed between the hinge rod and the bottom mounting block;

[0029] The sensing end of the trigger switch extends to the upper part of the bottom mounting block and is used to be rotated and abutted by the hinge rod.

[0030] In a further technical solution, the position baffle includes a roller bracket mounted at the bottom, with rollers mounted at the bottom of the roller bracket.

[0031] Compared with existing technologies, it has the following beneficial effects:

[0032] This invention features a vacuum connection component installed at the bottom of the sand box. The bottom space facilitates processing and fixation without interfering with the overall casting production line operation. The vacuum connection component includes a lifting cylinder that moves up and down to insert the sand box and create a vacuum; a lifting cylinder is used for directional insertion of the connecting block; a sealing ring is installed outside the central ring and connected within the annular groove to ensure the insertion and sealing of the upper part. A negative pressure hose is installed to connect the connecting block, avoiding wear and collisions caused by the straight rigid pipe moving up and down with the cylinder.

[0033] This invention uses a retaining ring plate to ensure the lowering position of the output end of the lifting cylinder and resets the position of the connection port to avoid interference between the negative pressure hose and the bend joint during the movement of the connecting body, thus preventing wear and failure.

[0034] This invention utilizes a bent pressure plate that is pressed by rollers, generating a downward compressive force that forces two sets of hinged rods to rotate. This downward pressure triggers a switch, causing a signal change. The two sets of hinged rods balance the force on the bottom of the pressure plate, with only one set generating the sensing end of the compression trigger switch. The limit switch also functions as a trigger signal. Attached Figure Description

[0035] Figure 1 This is a cross-sectional view of the vacuum negative pressure lifting device and sand box of this utility model. Figure 1 ;

[0036] Figure 2 for Figure 1 Enlarged view of part A;

[0037] Figure 3 This is a side view of the vacuum negative pressure lifting device of this utility model;

[0038] Figure 4 This is a schematic diagram of the gas delivery circuit of this utility model;

[0039] Figure 5 This is a schematic diagram of the negative pressure generating system of this utility model;

[0040] Figure 6 This is a front view of the vacuum negative pressure lifting device of this utility model;

[0041] Figure 7 This is a schematic diagram of the snap ring plate of this utility model;

[0042] Figure 8 This is a top sectional view of the connection between the opening and the negative pressure hose of this utility model.

[0043] Figure 9 This is a cross-sectional view of the vacuum negative pressure lifting device and sand box of this utility model. Figure 2 ;

[0044] Figure 10 This is a side view of the vacuum negative pressure lifting device and sand box of this utility model;

[0045] Figure 11 for Figure 10 Enlarged view of part C;

[0046] Figure 12 This is a cross-sectional view of the limit switch component installed on the top of the position frame according to this utility model.

[0047] In the picture:

[0048] 1. Positioning frame; 2. Lifting cylinder; 3. Connecting block; 4. Bend / Rotator; 5. Negative pressure hose;

[0049] 21. Gas delivery circuit; 22. Solenoid valve;

[0050] 31. Upper body; 32. Central ring; 34. Sealing ring;

[0051] 6. Snap ring plate; 61. Notch; 62. Transition recess; 63. Side stop bar; 64. Opening; 65. Ball bearing;

[0052] 7. Control ball valve;

[0053] 8. Limit switch; 81. Bottom mounting block; 82. Trigger switch; 83. Hinge rod; 84. Pressure plate; 85. Return spring;

[0054] 100. Sand box; 101. Connecting hole; 102. Isolation mesh plate; 103. Annular groove; 104. Position baffle; 105. Roller bracket; 106. Roller;

[0055] 200. Negative pressure generating system. Detailed Implementation

[0056] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0057] Example 1

[0058] Please see Figure 1-5 This invention provides a technical solution for a lifting device for vacuum negative pressure, comprising a position frame 1, on which a lifting cylinder 2 is mounted, the lifting cylinder 2 being vertically arranged; a connecting block 3 is mounted on the output end of the lifting cylinder 2, and a communication port is provided at the bottom of the connecting block 3; the communication port extends to the upper surface of the connecting block 3.

[0059] like Figure 2 As shown, the top diameter of the connecting block 3 is smaller than the inner diameter of the connecting hole 101 opened at the bottom of the sand box 100, and the bottom diameter is larger than the inner diameter of the connecting hole 101.

[0060] like Figure 3 As shown, a negative pressure hose 5 is connected to the connecting port, and a control ball valve 7 is installed on the negative pressure hose 5 to control the opening and closing of the negative pressure hose 5.

[0061] An air supply circuit 21 is installed at the input end of the lifting cylinder 2, such as... Figure 4 As shown Figure 3The content of the B symbol includes that a solenoid valve 22 is installed, and the solenoid valve 22 controls the opening and closing of the lifting cylinder 2. Figure 4 The gas supply circuit includes a gas source, a solenoid valve, a one-way regulating valve, and a lifting cylinder, which enables the lifting cylinder to rise and fall.

[0062] Negative pressure hose 5 is connected to external negative pressure generating system 200, such as... Figure 5 As shown. A negative pressure generating system is an adjustable system that generates negative pressure, including a negative pressure generating component, a pressure stabilizing tank, a filter, a pressure regulating valve, a gas-water separator, and an exhaust gas combustion chamber. The negative pressure generating component generates negative pressure and is controlled by an electrical control cabinet; the pressure stabilizing tank stabilizes the pressure; the filter and gas-water separator perform separation; and the pressure relief valve adjusts the pressure within the pipeline.

[0063] like Figure 1 As shown, an isolation mesh plate 102 is installed inside the sand box 100. The isolation mesh plate has holes with a diameter smaller than that of the sand and gravel inside the sand box. The isolation mesh plate 102 is located above the connection hole 101.

[0064] like Figure 2 As shown, the connecting block 3 includes an upper body 31 and a central ring 32, which are coaxially arranged and integrally connected; the outer diameter of the upper body 31 is smaller than the inner diameter of the connecting hole 101; and an opening is formed in the upper body. Figure 2 The multi-directional air passage shown is used to create negative pressure. The outer diameter of the central ring 32 is larger than the inner diameter of the connecting hole 101. A sealing ring 34 is installed on the upper part of the central ring 32; an annular groove 103 is provided at the bottom of the sand box 100 outside the connecting hole 101, and the annular groove 103 is adapted to the sealing ring 34.

[0065] This invention connects the negative pressure hose and the sand box by inserting a connecting block into a connecting hole, forming a negative pressure air passage. A lifting cylinder is used for the directional insertion of the connecting block; a sealing ring is installed outside the central ring and connected within the annular groove to ensure the insertion and sealing of the upper body. A negative pressure hose is installed to install the connecting block, avoiding wear and collisions caused by the straight rigid pipe rising and falling with the cylinder.

[0066] Example 2

[0067] like Figure 6-8 As shown, another embodiment of this utility model is provided. Based on embodiment 1, a connecting port is installed at the bottom of the connecting port, and a bend connector 4 is installed. The bend connector 4 is "L" shaped and is connected to the negative pressure hose 5. The vertical length of the bend connector is less than the horizontal length, so that the negative pressure hose can be extended out of the position frame as much as possible.

[0068] A retaining ring plate 6 is installed on the cylinder body of the lifting cylinder 2. A notch 61 is provided on the upper part of the retaining ring plate 6. The size of the notch 61 is larger than the diameter of the piston rod of the lifting cylinder 2 and smaller than the outer diameter of the connecting block 3. The notch is outside the piston rod, which helps to limit the lowering limit position of the connecting block and protects the negative pressure hose.

[0069] As the bend joint descends, it may interfere with some parts. Therefore, a transition recess 62 is provided on the retaining ring plate 6. The transition recess 62 is located at the bottom of the bend joint 4. The transition recess 62 is adapted to the bend joint 4.

[0070] like Figure 7 As shown, a side stop bar 63 is installed on the side of the retaining ring plate 6 facing the negative pressure hose 5. One end of the side stop bar 63 is detachably connected to the retaining ring plate 6, and the other end is provided with an opening 64; Figure 8 As shown, a ball bearing 65 is provided in the opening 64. The ball bearing rolls on the surface of the negative pressure hose, causing the negative pressure hose 5 to move up and down with the connecting block 3 in the opening 64.

[0071] Positioning bracket 1 is L-shaped and is detachably connected to the bottom of lifting cylinder 2.

[0072] This invention uses a retaining ring plate to ensure the lowering position of the output end of the lifting cylinder and resets the position of the connection port to avoid interference between the negative pressure hose and the bend joint during the movement of the connecting body, thus preventing wear and failure.

[0073] Example 3

[0074] like Figure 9-12 As shown, this is another embodiment of the present invention, based on embodiment 1, as follows: Figure 10 As shown, a limit switch 8 is installed on the position frame 1, and a position baffle 104 is fixedly installed at the bottom of the sand box 100. Figure 10 The dashed line indicates the location of the connecting hole.

[0075] like Figure 12 As shown, the limit switch component 8 includes a bottom mounting block 81, a trigger switch 82 is mounted in the middle of the bottom mounting block 81, the trigger switch 82 is set upward, a hinge rod 83 is mounted on the bottom mounting block 81, and a pressure plate 84 is mounted on the top of the hinge rod 83; the pressure plate 84 is in movable contact with the position baffle 104.

[0076] The two sides of the pressure plate 84 are bent downwards, with the bottom edge line lower than the bottom height of the position baffle 104 and the top edge line higher than the bottom height of the position baffle 104.

[0077] Two sets of hinge rods 83 are symmetrically arranged, and their tops are rotatably connected to the pressure plate 84; the bottom of the hinge rods 83 is hinged to the bottom mounting block 81; a return spring 85 is also installed between the hinge rods 83 and the bottom mounting block 81; the sensing end of the trigger switch 82 extends to the upper part of the bottom mounting block 81 and is used to be rotated and abutted by the hinge rods 83.

[0078] like Figure 11 As shown, the position baffle 104 includes a roller bracket 105 mounted at the bottom, and a roller 106 is mounted at the bottom of the roller bracket 105.

[0079] When the position baffle at the bottom of the sandbox moves to Figure 11 At this time, the rollers do not press against the pressure plate;

[0080] When the rollers press against the bends on both sides of the pressure plate, the initial position is higher than the bottom edge of the bend; therefore, the pressing causes the pressure plate to move downward, and at this time the two sets of hinge rods bend downward.

[0081] When the roller presses against the horizontal center of the pressure plate, the maximum pressure value is reached; a set of hinged rods bends downward to their limit and presses against the sensing end of the trigger switch; the sensing end of the trigger switch... Figure 11 and 12 As shown, the trigger head extends from the bottom mounting block and is triggered to return to its original position using a vertical spring. When pressure is applied until the trigger switch signal changes, controlling the sand box to stop operating, the connecting hole reaches the top of the connecting block. Therefore, the signal change occurs when the roller initially reaches the horizontal position of the pressure plate.

[0082] This invention utilizes a bent pressure plate that is pressed by rollers, generating a downward compressive force that forces two sets of hinged rods to rotate. This downward pressure triggers a switch, causing a signal change. The two sets of hinged rods balance the force on the bottom of the pressure plate, with only one set generating the sensing end of the compression trigger switch. The limit switch also functions as a trigger signal.

[0083] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention.

Claims

1. A lifting device for vacuum negative pressure, characterized in that, Includes a position frame (1), on which a lifting cylinder (2) is installed, the lifting cylinder (2) is vertically arranged; a connecting block (3) is installed at the output end of the lifting cylinder (2), and a communication port is provided at the bottom of the connecting block (3); the communication port extends to the upper surface of the connecting block (3); The top diameter of the connecting block (3) is smaller than the inner diameter of the connecting hole (101) opened at the bottom of the sand box (100), and the bottom diameter is larger than the inner diameter of the connecting hole (101); A negative pressure hose (5) is connected to the connection port, and a control ball valve (7) is installed on the negative pressure hose (5) to control the opening and closing of the negative pressure hose (5).

2. A lifting device for vacuum negative pressure according to claim 1, characterized in that, The input end of the lifting cylinder (2) is equipped with an air supply circuit (21) and includes a solenoid valve (22), which controls the opening and closing of the lifting cylinder (2); the negative pressure hose (5) is connected to an external negative pressure generating system (200).

3. A lifting device for vacuum negative pressure according to claim 2, characterized in that, An isolation mesh plate (102) is installed inside the sand box (100), and the isolation mesh plate (102) is located above the connection hole (101); The connecting block (3) includes an upper body (31) and a central ring (32), which are coaxially arranged and integrally connected; the outer diameter of the upper body (31) is smaller than the inner diameter of the connecting hole (101); the outer diameter of the central ring (32) is larger than the inner diameter of the connecting hole (101).

4. A lifting device for vacuum negative pressure according to claim 3, characterized in that, A sealing ring (34) is installed on the upper part of the central ring (32); an annular groove (103) is provided at the bottom of the sand box (100) outside the connecting hole (101), and the annular groove (103) is adapted to the sealing ring (34).

5. A lifting device for vacuum negative pressure according to claim 1, characterized in that, A connecting port is installed at the bottom of the connecting port, and a bend connector (4) is installed. The bend connector (4) is "L" shaped and is connected to the negative pressure hose (5). A retaining ring plate (6) is installed on the cylinder body of the lifting cylinder (2), and a notch (61) is provided on the upper part of the retaining ring plate (6); the size of the notch (61) is larger than the piston rod diameter of the lifting cylinder (2) and smaller than the outer diameter of the connecting block (3).

6. A lifting device for vacuum negative pressure according to claim 5, characterized in that, The retaining ring plate (6) has a transition recess (62) which is located at the bottom of the bend joint (4); the transition recess (62) is adapted to the bend joint (4).

7. A lifting device for vacuum negative pressure according to claim 6, characterized in that, A side stop bar (63) is installed on the side of the retaining ring plate (6) facing the negative pressure hose (5). One end of the side stop bar (63) is detachably connected to the retaining ring plate (6), and the other end is provided with an opening (64). A ball bearing (65) is provided in the opening (64) and constrains the negative pressure hose (5) to rise and fall with the connecting block (3) in the opening (64). The position frame (1) is "L" shaped and is detachably connected to the bottom of the lifting cylinder (2).

8. A lifting device for vacuum negative pressure according to claim 7, characterized in that, Limit switch (8) is installed on the position frame (1), and position baffle (104) is fixedly installed at the bottom of the sand box (100). The limit switch component (8) includes a bottom mounting block (81), a trigger switch (82) is installed in the middle of the bottom mounting block (81), the trigger switch (82) is set upward, a hinge rod (83) is installed on the bottom mounting block (81), and a pressure plate (84) is installed on the top of the hinge rod (83). The pressure plate (84) and the position baffle (104) are in movable contact; The pressure plate (84) is bent downward on both sides, with the bottom edge line lower than the bottom height of the position baffle (104) and the top edge line higher than the bottom height of the position baffle (104).

9. A lifting device for vacuum negative pressure according to claim 8, characterized in that, Two sets of hinge rods (83) are symmetrically arranged, and the top of the hinge rods (83) are rotatably connected to the pressure plate (84); the bottom of the hinge rods (83) is hinged to the bottom mounting block (81). A return spring (85) is also installed between the hinge rod (83) and the bottom mounting block (81); The sensing end of the trigger switch (82) extends to the upper part of the bottom mounting block (81) and is used to be rotated against by the hinge rod (83).

10. A lifting device for vacuum negative pressure according to claim 8, characterized in that, The position baffle (104) includes a roller bracket (105) mounted at the bottom, and a roller (106) is mounted at the bottom of the roller bracket (105).

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