A safety protection device for a large core shooter

Abstract

The utility model relates to a large -scale core -shooting machine safety device, including machine body, upper die, lower mould, protective door, control rod, extension shaft, gear, rack, slide bar, positioning bolt, wedge sliding block, swing board and safety light curtain. Lower mould is movable before and after on the workstation, and is moved to the position cooperation upper die and completes the core shooting operation after the operation;Protective door can slide along the track vertically, and is used for shielding the cavity front side open mouth;Protective door is linked to rise through control rod, gear and rack, and is kept in the highest position by the positioning bolt on the slide bar and is clamped into the positioning groove;When lower mould moves to the position, drives extrusion rod to push swing board, makes ball head press wedge sliding block, removes the positioning bolt limit, and protective door slowly falls due to gravity, realizes the protection;Counterweight structure slows down the falling speed, and safety light curtain is used for sensing the operation area state, and improves the overall protection performance. The device realizes the linkage control of protective door and mould action, and the protection process is safe and reliable.

Description

Technical Field

[0001] This utility model belongs to the field of core shooting machine technology, and specifically relates to a safety protection device for a large core shooting machine. Background Technology

[0002] Core shooters are specialized pieces of equipment widely used in casting processes. They are primarily used to inject core sand into metal molds to form sand cores. Large core shooters, due to their wide operating range, large mold volume, and high operating speed, involve significant mechanical energy and the coordinated operation of multiple mechanical structures in the mold alignment, opening, sand core forming, and ejection processes. Therefore, they place higher demands on the personal safety of operators.

[0003] In existing technologies, large core shooting machines mostly use cylinders or motors to drive the mold movement to complete the core shooting process. Some equipment has been equipped with basic protective doors or light curtain systems, but the following technical problems are common: On the one hand, the protective door often relies on the continuous output power of the cylinder to maintain its opening and closing state during the opening or closing process. When the power is cut off or the air pressure fluctuates, the protective door may fall out of control, posing a risk of injuring the operator. On the other hand, some protective devices lack a structure that is synchronized with the movement of the mold, and cannot achieve automatic opening and closing of the protective door and precise linkage with the working status, which can easily lead to lack of protection or malfunction, thereby affecting work safety and production efficiency. Utility Model Content

[0004] To address the problems existing in the prior art, the purpose of this utility model is to provide a safety protection device for a large core shooting machine. This device has a self-locking function and can be linked with the movement of the mold for control, so as to improve the intelligence level and reliability of the equipment while ensuring the safety of operators.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a safety protection device for a large core shooting machine, comprising a body, a cavity formed at the center of the surface of the body, a worktable provided at the front of the body, an upper mold sliding vertically inside the cavity, a lower mold mounted on the surface of the worktable, and the lower mold corresponding to the position of the upper mold when it moves to the rearmost side.

[0006] The cavity has vertically arranged track rods on both sides of the front opening, and a protective door is vertically slidably installed between the two track rods. The protective door is used to block the front opening of the cavity during core firing.

[0007] The top of the machine body is symmetrically provided with support bases on one side, and a control rod is rotatably mounted on the surface of the support bases located on the front side. The control rod is used to control the raising and lowering of the protective door.

[0008] Furthermore, a fixing bolt is provided on the front side of the protective door surface, a U-shaped groove is opened on the surface of the control rod, the fixing bolt is placed inside the U-shaped groove, and an observation window is provided at the center of the protective door surface.

[0009] Furthermore, an extension plate is provided at one end of the control rod away from the U-shaped groove, the extension plate is placed on the other side of the rotation axis of the control rod, and a counterweight is installed on the surface of the extension plate.

[0010] Furthermore, the control lever has a rearward extension shaft that passes through two support seats. The surface of the extension shaft is provided with gears. A rack is horizontally slidably mounted on one side of the top of the machine body. The rack meshes with the gears. One side of the rack is mounted on a cylinder.

[0011] Furthermore, multiple protruding plates are fixed on one side of the back of the machine body. The multiple protruding plates are vertically distributed. A positioning groove is opened on the rear end face of the extension shaft. When the protective door is fully raised, the positioning groove is facing downwards, and the protruding plates are placed directly below the positioning groove. A sliding rod is vertically slidably installed on the surface of the multiple protruding plates, and a positioning bolt is provided at the top of the sliding rod.

[0012] Furthermore, the positioning bolt is adapted to the internal dimensions of the positioning groove, and a spring is sleeved on the surface of the slide rod. The spring is placed between the topmost convex plate and the positioning bolt, and the spring applies an upward thrust to the positioning bolt.

[0013] Furthermore, a wedge-shaped slider is provided at the bottom of the slide bar, a boss is provided on the back of the machine body, a swing plate is horizontally rotatably mounted on the surface of the boss, an extrusion rod is provided at one end of the front surface of the swing plate and a ball head is provided at the other end, the extrusion rod corresponds to the lower mold that has moved to the last side, and the ball head contacts the inclined surface of the wedge-shaped slider.

[0014] Furthermore, safety light curtains are symmetrically arranged on the front side of the body, with the two safety light curtains respectively positioned below the front opening of the cavity.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] This invention provides a protective door on the front side of the cavity, which can slide up and down along a track rod. During core shooting, the door automatically covers the opening of the cavity, effectively solving the problem in the prior art where the opening is not blocked in time during operation due to the lack of a protective structure linked to the mold movement. This enhances the active protection capability of the equipment during operation.

[0017] This invention utilizes a rack and pinion meshing structure, along with a cylinder to control the rack's unidirectional sliding, to enable the protective door to actively rise and accumulate power. Once the protective door reaches its designated position, a positioning bolt and a positioning groove work together to limit the angle, ensuring the protective door remains stably in the upper position. This eliminates the need for continuous air or electricity supply to maintain its position, solving the problem of traditional structures where the protective door requires continuous work to maintain its position and is prone to sudden drops due to energy interruption. This fundamentally improves the safety and reliability of its use.

[0018] This invention, by setting a spring-loaded sliding rod and a positioning bolt, enables the protective door to automatically lock when it rises to the positioning groove. Furthermore, the lower die pushes the extrusion rod to drive the swing plate, and the ball head pushes the wedge-shaped slider to release the positioning bolt, forming a self-unlocking structure that is linked to the movement state of the mold. This solves the problem in existing core shooting machines where the movement of the protective door relies on manual or independent control and is not synchronized with the state of the mold station, effectively improving the automation level and ease of operation of the equipment.

[0019] This invention introduces a counterweight mechanism into the falling structure of the protective door. The counterweight at the end of the control rod slows down the falling speed of the protective door. Even if the protective door closes automatically in a state of loss of control or gravity release, its falling impact force is limited, which can effectively reduce the potential injury to personnel who accidentally enter the work area and solve the problem of the risk of pinching injury caused by the falling of the protective door due to gravity in the traditional structure.

[0020] This utility model features a through-beam safety light curtain structure in front of the cavity, used to monitor the status of personnel in the work area in real time. When personnel are detected approaching or entering the danger zone, the protective door is automatically prevented from falling, further enhancing the safety protection level. This compensates for the shortcomings of traditional equipment in lacking active sensing and linkage braking functions, providing dual safety protection for core shooting equipment. Attached Figure Description

[0021] Figure 1 This is a front view structural diagram of the present utility model;

[0022] Figure 2 This is a three-dimensional structural diagram of the protective door of this utility model in the open state;

[0023] Figure 3 This is a three-dimensional structural diagram of the protective door of this utility model in the closed state;

[0024] Figure 4 This is a schematic diagram of the back structure of the body of this utility model;

[0025] Figure 5 This is a schematic diagram of the control lever transmission mechanism of this utility model;

[0026] Figure 6 This is a schematic diagram of the protective door structure of this utility model.

[0027] The attached diagram lists the components represented by each number as follows:

[0028] 1. Machine body; 11. Worktable; 12. Cavity; 13. Track rod; 14. Support base; 15. Protruding plate; 16. Boss; 2. Upper mold; 3. Lower mold; 4. Protective door; 41. Observation window; 42. Fixing bolt; 5. Control rod; 51. U-shaped groove; 52. Extension plate; 53. Counterweight; 54. Extension shaft; 55. Gear; 56. Positioning groove; 57. Gear rack; 6. Slide rod; 61. Positioning bolt; 62. Wedge slider; 7. Spring; 8. Swing plate; 81. Extrusion rod; 82. Ball head; 9. Safety light curtain. Detailed Implementation

[0029] To make the objectives and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the following text is merely used to describe one or more specific embodiments of this utility model and does not strictly limit the scope of protection specifically claimed by this utility model.

[0030] refer to Figures 1-6 As shown, a safety protection device for a large core-shooting machine includes a body 1. A cavity 12 is formed at the center of the surface of the body 1. The cavity 12 is a working space for the upper and lower molds to align and perform core-shooting operations. A worktable 11 is provided on the front side of the body 1. The worktable 11 is a planar structure and is connected to the cavity 12. It is used to support the installation and movement trajectory of the lower mold 3. The lower mold 3 can be slidably installed on the surface of the worktable 11 in the front-back direction. When the lower mold 3 moves to the rearmost side, it corresponds to the position of the upper mold 2 in the cavity 12, completing the alignment of the core-shooting mold cavity. The upper mold 2 is vertically slidably installed inside the cavity 12. The upper mold 2 is mounted on a slide rail mechanism and its lifting action is controlled by a vertical drive component. The upper mold 2 and the lower mold 3 align to form a core-shooting mold cavity. A closed mold cavity is formed to complete the core sand injection process; two vertical rail rods 13 are set on both sides of the front opening of the cavity 12. The rail rods 13 are fixed to the front of the machine body 1 and form a vertical guide rail mechanism for the protective door 4. The protective door 4 is vertically slidably installed between the two rail rods 13. The protective door 4 moves up and down along the rail rods 13 to mechanically block the front opening of the cavity 12 during core injection; a support seat 14 is symmetrically arranged on one side of the top of the machine body 1. The support seat 14 is used to fix the rotation structure of the extension shaft 54 ​​and the control rod 5. The control rod 5 is rotatably installed on the surface of the support seat 14 on the front side. The control rod 5 can rotate around the transverse axis and is linked with the protective door 4 to control the raising and lowering of the protective door 4.

[0031] refer to Figure 2 , Figure 5 and Figure 6As shown, a fixing bolt 42 is provided on the front side of the protective door 4. The fixing bolt 42 is fixed to the outside of the protective door 4 by screwing or welding and protrudes outward to form a mechanical connection with the control rod 5. A U-shaped groove 51 is provided on the surface of the control rod 5. The U-shaped groove 51 is recessed in the center of the upper end face of the control rod 5 and its size matches that of the fixing bolt 42 to achieve the embedded fit of the fixing bolt 42. After the fixing bolt 42 is placed inside the U-shaped groove 51, it can rotate with the control rod 5 to realize the synchronous lifting and lowering action of the protective door 4. An observation window 41 is provided in the center of the surface of the protective door 4. The observation window 41 is made of transparent tempered glass or plexiglass and is embedded in the upper center of the protective door 4 to observe the internal state of the mold cavity during core shooting operation, while maintaining a safety isolation function.

[0032] refer to Figure 2 and Figure 5 As shown, an extension plate 52 is provided at the end of the control rod 5 away from the U-shaped groove 51. The extension plate 52 is installed at the tail end of the control rod 5 by welding. The extension plate 52 is located on the other side of the rotation axis of the control rod 5 and is distributed in a lever structure with the control rod 5 to provide balance for the protective door 4. A counterweight 53 is installed on the surface of the extension plate 52. The counterweight 53 is a block metal structure and is installed at the free end of the extension plate 52. The rotational balance of the control rod 5 is adjusted by gravity, thereby slowing down the speed of the protective door 4 during its fall due to its own weight and reducing the possibility of injury to the staff.

[0033] refer to Figure 2 and Figure 3 As shown, an extension shaft 54 ​​is provided rearward along the rotation axis of the control lever 5. The extension shaft 54 ​​is installed between two support seats 14 through a bearing structure to ensure uniform force distribution and stable transmission during rotation. The extension shaft 54 ​​passes through the two support seats 14 and extends laterally, forming a synchronous drive shaft for the entire protective door lifting system. A gear 55 is provided on the surface of the extension shaft 54. The gear 55 is fixed to the extension shaft 54 ​​by a key connection, forming a rotational force conversion structure. The gear 55 meshes with the rack 57 for transmission. A rack 57 is horizontally slidably installed on one side of the top of the body 1. The rack 57 is a long rack structure arranged horizontally, with the other end connected to the cylinder piston rod, and is driven by the cylinder to control its reciprocating sliding. After the rack 57 meshes with the gear 55, it can convert the linear motion of the cylinder into the rotational motion of the control lever 5, thereby driving the protective door 4 to rise and fall.

[0034] refer to Figure 4As shown, multiple protruding plates 15 are fixed on one side of the back of the body 1. The multiple protruding plates 15 are arranged at intervals in the vertical direction and installed on the rear side wall of the body 1, serving as a guide support structure for the slide rod 6. A positioning groove 56 is opened on the rear end face of the extension shaft 54. The positioning groove 56 is an arc-shaped or semi-circular groove structure, which is used to cooperate with the positioning bolt 61 when the protective door 4 is raised to a preset height to achieve the function of limiting and retaining. When the protective door 4 is fully raised, the positioning groove 56 is positioned downward, corresponding to the positioning mechanism set on the protruding plate 15. The slide rod 6 is vertically slidably installed on the surface of the multiple protruding plates 15. The slide rod 6 is a slender structure that can slide freely in the protruding plate 15 and restrict its directionality. A positioning bolt 61 is set at the top of the slide rod 6.

[0035] refer to Figure 4 As shown, the positioning bolt 61 is adapted to the internal dimensions of the positioning groove 56. When the protective door 4 moves to the highest point, the positioning bolt 61 can accurately embed into the positioning groove 56, thereby limiting the rotation angle of the control rod 5 and preventing the protective door 4 from sliding down. A spring 7 is sleeved on the surface of the slide rod 6. The spring 7 is a helical compression spring, which is set between the topmost convex plate 15 and the positioning bolt 61. It continuously applies an upward elastic force to the positioning bolt 61, providing an automatic locking function during the upward movement of the protective door 4, ensuring that the positioning structure is automatically positioned and quickly locked.

[0036] refer to Figure 4 As shown, a wedge-shaped slider 62 is provided at the bottom of the slide rod 6. The wedge-shaped slider 62 is a block with an inclined surface. Its inclined surface faces forward and contacts the ball head 82. It is used to receive the pressure transmitted by the ball head 82, thereby pushing the slide rod 6 to move downward in the vertical direction and realizing the release of the positioning bolt 61. A boss 16 is provided on the back of the machine body 1. The boss 16 is used to install and support the swing structure. A swing plate 8 is horizontally rotatably mounted on the surface of the boss 16. The swing plate 8 is connected to the boss 16 through a central rotating shaft and can rotate around the horizontal direction. A pressing rod 81 is provided at one end of the front surface of the swing plate 8. The pressing rod 81 corresponds to the lower mold 3 that has moved to the last side position. When the lower mold 3 moves into place, it applies a backward thrust to the pressing rod 81. A ball head 82 is provided at the other end of the swing plate 8. The ball head 82 is connected to the swing plate 8 through a hinge. After being pushed forward by the pressing rod 81, it moves forward and contacts the inclined surface of the wedge-shaped slider 62, realizing the automatic downward movement of the slide rod 6.

[0037] refer to Figure 1 and Figure 3 As shown, safety light curtains 9 are symmetrically arranged on the front side of the machine body 1. The two safety light curtains 9 are respectively placed below the front opening of the cavity 12. The safety light curtains 9 form a sensing area through infrared beams to detect whether there are operators entering the work area. When the operator enters the area covered by the safety light curtain 9, the control system will automatically prevent the protective door 4 from falling or stop the mold movement to prevent accidental injury and realize the intelligent safety linkage control function of electromechanical integration.

[0038] The working principle of this utility model is as follows: the lower mold 3 is controlled to move back and forth along the surface of the worktable 11 by the moving mechanism. When the lower mold 3 moves to the last side, it is placed directly below the upper mold 2. The core shooting is achieved through the cooperation of the two. The cylinder pushes the rack 57 to slide, so that the meshing of the rack 57 and the gear 55 drives the protective door 4 to move upward to store energy and increase potential energy. At the same time, since the spring 7 always maintains an upward pushing force on the positioning bolt 61, when the protective door 4 moves to the highest position, the positioning bolt 61 can cooperate with the positioning groove 56 to limit the angle of the control rod 5, thereby ensuring that the protective door 4 is placed at the highest position and fixed. The cylinder only controls the rack 57 to move in one direction. After the movement, the work is released. At this time, the front of the cavity 12 is open.

[0039] During operation, the lower mold 3 is controlled to move backward. When it reaches the rearmost position, it can press the extrusion rod 81 backward, causing the swing plate 8 to rotate. At this time, the ball head 82 at the other end moves forward. Since the slide rod 6 is limited by multiple protrusions 15, it can only slide vertically. Therefore, when the ball head 82 presses the inclined surface of the wedge-shaped slider 62, it presses down on the slide rod 6, causing the positioning bolt 61 to move down and disengage from the positioning groove 56. At this time, the extension shaft 54 ​​can rotate freely. Due to its own weight, the protective door 4 will move down. At the same time, the counterweight 53 at the other end can reduce the downward speed. The downward movement of the protective door 4 blocks the opening at the front of the cavity 12, improving safety. At this time, the protective door 4 is fixed by the upward movement of the cylinder to store force. When the lower mold 3 moves into place, the restriction is automatically lifted. Due to its own weight, the downward force of the protective door 4 is limited. Even if the staff is placed inside the cavity 12, they will not be injured by the downward movement of the protective door 4. At the same time, the safety light curtain 9 on the outside further improves safety.

[0040] The above description is merely a preferred embodiment of this utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model. Structures, devices, and operating methods not specifically described or explained in this utility model, unless otherwise specified or limited, shall be implemented using conventional methods in the field.

Claims

1. A safety protection device for a large core shooting machine, comprising a body (1), characterized in that: The machine body (1) has a cavity (12) at the center of its surface. A worktable (11) is provided on the front side of the machine body (1). An upper mold (2) slides vertically inside the cavity (12). A lower mold (3) is installed on the surface of the worktable (11). When the lower mold (3) moves to the rearmost side, it corresponds to the position of the upper mold (2). The cavity (12) has a rail rod (13) vertically installed on both sides of the front opening. A protective door (4) is vertically slidably installed between the two rail rods (13). The protective door (4) is used to block the front opening of the cavity (12) during core firing. The top side of the body (1) is symmetrically provided with a support base (14), and a control rod (5) is rotatably installed on the surface of the support base (14) located on the front side. The control rod (5) is used to control the raising and lowering of the protective door (4).

2. The safety protection device for a large core shooting machine according to claim 1, characterized in that: A fixing bolt (42) is provided on the front side of the surface of the protective door (4), and a U-shaped groove (51) is provided on the surface of the control rod (5). The fixing bolt (42) is placed inside the U-shaped groove (51), and an observation window (41) is provided at the center of the surface of the protective door (4).

3. A safety protection device for a large core shooting machine according to claim 2, characterized in that: An extension plate (52) is provided at one end of the control rod (5) away from the U-shaped groove (51). The extension plate (52) is located on the other side of the rotation axis of the control rod (5). A counterweight (53) is installed on the surface of the extension plate (52).

4. A safety protection device for a large core shooting machine according to claim 1, characterized in that: The control lever (5) has an extension shaft (54) located at the rear of its rotation axis. The extension shaft (54) passes through two support seats (14). A gear (55) is provided on the surface of the extension shaft (54). A rack (57) is horizontally slidably installed on one side of the top of the body (1). The rack (57) meshes with the gear (55). One side of the rack (57) is mounted on the cylinder.

5. A safety protection device for a large core shooting machine according to claim 4, characterized in that: Multiple protruding plates (15) are fixed on one side of the back of the body (1). The multiple protruding plates (15) are vertically distributed. A positioning groove (56) is opened on the rear end face of the extension shaft (54). When the protective door (4) is fully raised, the positioning groove (56) is facing downwards. The protruding plates (15) are placed directly below the positioning groove (56). A sliding rod (6) is vertically slidably installed on the surface of the multiple protruding plates (15). A positioning bolt (61) is provided on the top of the sliding rod (6).

6. A safety protection device for a large core shooting machine according to claim 5, characterized in that: The positioning bolt (61) is adapted to the internal dimensions of the positioning groove (56). A spring (7) is sleeved on the surface of the slide rod (6). The spring (7) is placed between the topmost convex plate (15) and the positioning bolt (61). The spring (7) applies an upward thrust to the positioning bolt (61).

7. A safety protection device for a large core shooting machine according to claim 6, characterized in that: The bottom of the slide bar (6) is provided with a wedge-shaped slider (62), the back of the machine body (1) is provided with a boss (16), the surface of the boss (16) is horizontally rotated and mounted with a swing plate (8), one end of the front surface of the swing plate (8) is provided with an extrusion rod (81) and the other end is provided with a ball head (82), the extrusion rod (81) corresponds to the lower mold (3) that moves to the last side, and the ball head (82) contacts the inclined surface of the wedge-shaped slider (62).

8. A safety protection device for a large core shooting machine according to claim 1, characterized in that: The front side of the body (1) is symmetrically provided with safety light curtains (9), and the two safety light curtains (9) are respectively placed below the front opening of the cavity (12).

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