Sand box centering device
By introducing sensors and control units into the sand box alignment device, combined with the frame and alignment components, high-precision sand box alignment is achieved, solving the problems of insufficient alignment accuracy and complex structure of existing devices, reducing costs and simplifying maintenance.
Patent Information
- Application Number
- CN202520203142.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-08
- Publication Date
- 2026-01-02
- Estimated Expiration
- 2035-02-08
AI Technical Summary
Existing sandbox alignment devices suffer from insufficient alignment accuracy, especially in meeting the high precision requirements of micron or even submicron level. Furthermore, their complex structure leads to high equipment costs and maintenance difficulties.
It adopts a combination of frame, guide column, lifting platform, horizontal and vertical centering components, as well as sensors and control unit. The sensor monitors the contact status between the gripper and the sand box in real time, and the controller precisely controls the centering action, which simplifies the structure and improves the centering accuracy.
It significantly improves the accuracy of sand box alignment, meets the requirements of high-precision casting, reduces equipment manufacturing costs, and simplifies the maintenance process.
Smart Images
Figure CN223748503U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of foundry production line, in particular to a sand box centering device. BACKGROUND
[0002] In the foundry production field, the sand box as the key appliance of bearing and shaping sand mould, the accuracy of its centering positioning directly determines the effectiveness of the whole foundry process and the quality of the casting. From the perspective of sand mould forming, when the sand box is accurately centered, the sand mould can be uniformly stressed in the filling, compacting and solidifying links, ensuring the clear sand mould profile and stable size, thereby laying a solid foundation for the production of high-quality castings. Once the sand box centering deviates, the sand mould may have local over-thickness or over-thinness, which can easily cause casting defects such as under-pouring and cold shut in the subsequent pouring process, seriously affecting the integrity and mechanical properties of the casting.
[0003] Some traditional sand box centering devices adopt simple mechanical positioning structures, such as fixed clamping grooves or manually adjusted baffles to realize centering. This way cannot meet the high-precision casting requirements of microns or even sub-microns when facing sand boxes with high size accuracy requirements, because of the human operation errors and tolerance accumulation of the mechanical structure itself. The centering accuracy can only reach millimeter level, far from meeting the requirements. Some complex sand box centering devices attempt to improve the centering accuracy through multi-axis linkage mechanisms, but bring a series of new problems. Such devices usually contain a large number of parts, such as complex transmission chains and gear sets, which not only greatly increase the manufacturing cost of the equipment, but also require professional technicians to spend a lot of time in checking, calibrating and replacing parts during daily maintenance, with extremely high maintenance cost. Therefore, a high-precision and simple-structure sand box centering device has important practical significance. SUMMARY
[0004] To solve the above technical problems, the utility model provides a high-precision and simple-structure sand box centering device.
[0005] The utility model relates to a sand box centering device, which comprises:
[0006] A rack encloses a centering station, and a guide column is arranged in the centering station;
[0007] A height adjusting assembly comprises a lifting platform and a lifting motor. The lifting platform is arranged horizontally in the centering station and is slidingly connected to the guide column. The lifting platform is driven to move to adapt to sand boxes of different heights.
[0008] A transverse centering assembly and a longitudinal centering assembly are installed on the lower surface of the lifting platform. The transverse centering assembly comprises a transverse opening and closing mechanism and two transverse clamping jaws. The longitudinal centering assembly comprises a longitudinal opening and closing mechanism and two longitudinal clamping jaws, which are used to clamp the transverse and longitudinal sides of the sand box.
[0009] The control unit comprises a controller, sensors and an operation panel, the sensors are installed on the lateral clamping jaw and the longitudinal clamping jaw, and the controller is connected with the sensors, the operation panel, the lifting motor, the lateral opening and closing mechanism and the longitudinal opening and closing mechanism.
[0010] Further, the lateral opening and closing mechanism comprises two lateral sliding blocks, a lateral driving motor and a lateral screw rod, the lateral screw rod penetrates through the lateral sliding blocks and is threadedly matched with the lateral sliding blocks, two sections of threads with opposite directions are symmetrically arranged on the lateral screw rod, the two lateral sliding blocks are symmetrically arranged on the two sections of threads, the lateral driving motor is connected with one end of the lateral screw rod, and the lateral clamping jaw is installed on the lateral sliding blocks.
[0011] Further, the longitudinal opening and closing mechanism comprises a support, two longitudinal sliding blocks, a longitudinal driving motor and a longitudinal screw rod, the support is installed between the two lateral sliding blocks, the support is provided with a clearance hole corresponding to the lateral screw rod, the longitudinal screw rod penetrates through the longitudinal sliding blocks and is threadedly matched with the longitudinal sliding blocks, two sections of threads with opposite directions are symmetrically arranged on the longitudinal screw rod, the two longitudinal sliding blocks are symmetrically arranged on the two sections of threads, the longitudinal driving motor is connected with one end of the longitudinal screw rod, and the longitudinal clamping jaw is installed on the longitudinal sliding blocks.
[0012] Further, lateral guide rails are installed on the two sides of the lateral screw rod, and the lateral sliding blocks are slidably connected with the lateral guide rails; longitudinal guide rails are installed on the two sides of the longitudinal screw rod, and the longitudinal sliding blocks are slidably connected with the longitudinal guide rails.
[0013] Further, limiters are arranged at the two ends of the lateral guide rails and the longitudinal guide rails.
[0014] Further, rubber pads are arranged on the clamping surfaces of the lateral clamping jaw and the longitudinal clamping jaw.
[0015] Further, the sensors are infrared sensors or pressure sensors.
[0016] Further, the controller is a PLC controller or a single-chip microcomputer controller.
[0017] Further, the control unit further comprises a wireless communication module connected with a remote control terminal, so as to realize remote control and data transmission.
[0018] Compared with the prior art, the utility model has the advantages of:
[0019] 1. By installing the sensors on the lateral clamping jaw and the longitudinal clamping jaw, the contact state of the clamping jaw and the sand box can be monitored in real time, the controller can accurately control the action of the lateral opening and closing mechanism and the longitudinal opening and closing mechanism, the centering accuracy of the sand box can be effectively improved, the high-precision casting requirement can be met, and the centering accuracy of the traditional simple mechanical positioning structure is significantly improved.
[0020] 2、The device is composed of a rack, a height adjusting assembly, a transverse centering assembly, a longitudinal centering assembly and a control unit, compared with some devices which attempt to improve the centering precision through complex ways such as multi-axis linkage mechanism, the number of parts is obviously reduced, the structure is more simple, the manufacturing cost of the equipment is reduced, and the device is convenient to understand and maintain. BRIEF DESCRIPTION OF DRAWINGS
[0021] The utility model will be further described below in combination with the drawings.
[0022] Figure 1 It is the structural schematic diagram of the utility model;
[0023] Figure 2 It is the internal structure schematic diagram of the utility model;
[0024] Figure 3 It is the partial structure schematic diagram of the utility model Figure 1 ;
[0025] Figure 4 It is the partial structure schematic diagram of the utility model Figure 2 ;
[0026] Mark in the drawing: 1, rack; 11, guide column; 2, height adjusting assembly; 21, lifting platform; 22, lifting motor; 3, transverse centering assembly; 31, transverse opening and closing mechanism; 311, transverse sliding block; 312, transverse drive motor; 313, transverse screw rod; 314, transverse guide rail; 32, transverse clamping jaw; 4, longitudinal centering assembly; 41, longitudinal opening and closing mechanism; 411, support; 412, longitudinal sliding block; 413, longitudinal drive motor; 414, longitudinal screw rod; 415, longitudinal guide rail; 42, longitudinal clamping jaw; 5, control unit. DETAILED DESCRIPTION
[0027] The specific embodiment of the utility model will be further described in detail in combination with the drawings and examples. The following examples are used to illustrate the utility model, but not to limit the scope of the utility model.
[0028] As Figures 1 to 4 shown, the sand box centering device of the utility model comprises:
[0029] Rack 1, the centering station is enclosed, and the guide column 11 is arranged in the centering station;
[0030] Height adjusting assembly 2, including lifting platform 21 and lifting motor 22, lifting platform 21 is horizontally arranged in the centering station and is slidingly connected to guide column 11, and lifting platform 21 drives lifting platform 21 to move to adapt to sand box of different heights;
[0031] The transverse centering assembly 3 and the longitudinal centering assembly 4 are installed on the lower surface of the lifting platform 21, the transverse centering assembly 3 comprises a transverse opening and closing mechanism 31 and two transverse clamping jaws 32, and the longitudinal centering assembly 4 comprises a longitudinal opening and closing mechanism 41 and two longitudinal clamping jaws 42, which are used to clamp the transverse and longitudinal sides of the sand box;
[0032] The control unit 5 comprises a controller, sensors and an operation panel, the sensors are installed on the transverse clamping jaws 32 and the longitudinal clamping jaws 42, the controller is connected with the sensors, the operation panel, the lifting motor 22, the transverse opening and closing mechanism 31 and the longitudinal opening and closing mechanism 41;
[0033] The work station surrounded by the frame 1 provides a specific space for the centering operation of the sand box, the guide column 11 provides an accurate guide path for the movement of the lifting platform 21, which ensures that the lifting platform 21 can move stably and accurately in the vertical direction, the lifting motor 22 serves as a power output source, when it is necessary to adapt to sand boxes of different heights, the lifting motor 22 is started, through the rotation of the motor shaft, the mechanical structure connected with the motor shaft is driven, and then the lifting platform 21 is driven to move in the vertical direction in the centering work station, so as to meet the centering operation requirements of sand boxes of different heights; the transverse opening and closing mechanism 31 can drive the two transverse clamping jaws 32 to move in opposite or reverse directions, and the longitudinal opening and closing mechanism 41 drives the two longitudinal clamping jaws 42 to move correspondingly, when the sand box reaches the appropriate position in the centering work station, the transverse opening and closing mechanism 31 is started, so that the two transverse clamping jaws 32 approach and clamp the sand box from the transverse sides of the sand box, at the same time, the longitudinal opening and closing mechanism 41 is actuated to drive the longitudinal clamping jaws 42 to approach and clamp the sand box from the longitudinal sides of the sand box, so as to realize the accurate centering positioning of the sand box in the horizontal plane; the sensors can sense the contact state and pressure between the clamping jaws and the sand box in real time, and transmit these data to the controller in the form of electric signals, etc., after the controller receives the information transmitted by the sensors, the controller analyzes and processes the information according to the preset program and algorithm, and then sends corresponding control instructions to the lifting motor 22, the transverse opening and closing mechanism 31 and the longitudinal opening and closing mechanism 41, so as to realize the accurate control of the movement of each component, the operation panel is an interface for the operator to interact with the whole device, the operator inputs various parameters and instructions through the operation panel, such as setting the size specifications of the sand box, the centering accuracy requirements, etc., and then controls the whole sand box centering process, so as to significantly improve the accuracy of the sand box centering and meet the strict requirements of high-quality casting production on the accuracy of the sand box centering.
[0034] The transverse opening and closing mechanism 31 comprises two transverse sliders 311, a transverse driving motor 312 and a transverse screw rod 313, the transverse screw rod 313 penetrates through the transverse sliders 311 and is in threaded cooperation with the transverse sliders 311, two sections of threads in opposite directions are symmetrically arranged on the transverse screw rod 313, the two transverse sliders 311 are symmetrically arranged on the two sections of threads, the transverse driving motor 312 is connected with one end of the transverse screw rod 313, and the transverse clamping jaw 32 is installed on the transverse slider 311; the transverse driving motor 312 serves as a power source, when the motor is started, rotating power is generated, the output shaft of the motor is connected with one end of the transverse screw rod 313, so that the rotating movement of the motor is transmitted to the transverse screw rod 313, and the transverse screw rod 313 starts to rotate; when the transverse screw rod 313 rotates, the two transverse sliders 311 move along the axial direction of the screw rod in a threaded transmission mode, and because the directions of the threads are opposite, the two transverse sliders 311 move in opposite directions, along with the movement of the transverse sliders 311, the transverse clamping jaw 32 also moves synchronously, and the rotating angle of the transverse screw rod 313 has a clear corresponding relationship with the moving distance of the transverse slider 311, as long as the rotating amount of the transverse driving motor 312 is controlled, the moving distance of the transverse clamping jaw 32 can be accurately controlled; when the sand box needs to be transversely centered, the two transverse clamping jaws 32 are driven by the transverse sliders 311 to move to the two sides of the sand box and clamp or release the sand box, so as to realize the adjustment and fixation of the transverse position of the sand box; because the two transverse sliders 311 are symmetrically arranged, when the sand box is clamped or released, the two sides of the sand box can be uniformly stressed, the sand box is prevented from being deviated or deformed due to uneven stress, and the accuracy of sand box centering and the quality of the sand mold are improved.
[0035] The longitudinal opening and closing mechanism 41 comprises a support 411, two longitudinal sliding blocks 412 mounted at the bottom of the support 411, a longitudinal driving motor 413 and a longitudinal screw rod 414. The support 411 is mounted between the two transverse sliding blocks 311, and the support 411 is provided with a clearance hole corresponding to the transverse screw rod 313. The longitudinal screw rod 414 penetrates the longitudinal sliding blocks 412 and is in threaded cooperation with the longitudinal sliding blocks 412. Two sections of threads in opposite directions are symmetrically arranged on the longitudinal screw rod 414, and the two longitudinal sliding blocks 412 are symmetrically arranged on the two sections of threads. The longitudinal driving motor 413 is connected with one end of the longitudinal screw rod 414, and the longitudinal clamping jaws 42 are mounted on the longitudinal sliding blocks 412. During the centering process of the sand box, when longitudinal centering of the sand box is required, the longitudinal driving motor 413 drives the longitudinal screw rod 414 to rotate. According to the screw transmission principle, the two longitudinal sliding blocks 412 will move relatively or in opposite directions along the axial direction of the longitudinal screw rod 414, so that the two longitudinal clamping jaws 42 move to the longitudinal sides of the sand box. By accurately controlling the rotation direction and angle of the longitudinal driving motor 413, the longitudinal clamping jaws 42 can accurately clamp or release the sand box, thereby realizing the centering positioning of the sand box in the longitudinal direction. The clearance hole on the support 411 enables the longitudinal opening and closing mechanism 41 and the transverse opening and closing mechanism 31 to be reasonably arranged in space, avoiding mutual interference. When the transverse opening and closing mechanism 31 is working, the transverse screw rod 313 can normally rotate in the clearance hole.
[0036] Preferably, the two sides of the transverse screw rod 313 are provided with transverse guide rails 314, and the transverse sliding blocks 311 are in sliding connection with the transverse guide rails 314. The two sides of the longitudinal screw rod 414 are provided with longitudinal guide rails 415, and the longitudinal sliding blocks 412 are in sliding connection with the longitudinal guide rails 415. The guide rails provide accurate guidance for the movement of the sliding blocks, constrain the movement trajectory of the sliding blocks, so that they can only move linearly along the direction of the guide rails, avoiding deviation or shaking of the sliding blocks during movement, and ensuring that the clamping jaws can accurately reach the predetermined position to center the sand box.
[0037] Preferably, limiters are arranged at the two ends of the transverse guide rails 314 and the longitudinal guide rails 415. The main principle of the limiter is to limit the movement range of the sliding block on the guide rail through physical blocking, so as to avoid the sliding block from moving excessively and separating from the guide rail, prevent equipment damage caused thereby, and effectively prolong the service life of the equipment. The limiter is equipped with a sensor. When the sliding block touches the limiter, the sensor in the limiter will sense the action and feed back the signal to the controller. After receiving the signal, the controller will stop the operation of the corresponding driving motor according to the preset program, so as to ensure that the sliding block will not exceed the predetermined movement range.
[0038] Preferably, the clamping surfaces of the transverse clamping jaw 32 and the longitudinal clamping jaw 42 are provided with rubber pads; the rubber pads have good elasticity and flexibility, and when the transverse clamping jaw 32 and the longitudinal clamping jaw 42 clamp the sand box, the rubber pads first contact the surface of the sand box; due to the deformability of the rubber pads, they can adapt to the shape and contour of the sand box surface to a certain extent, so that the contact between the clamping jaw and the sand box is more close and uniform, thereby providing greater friction and ensuring the stability of clamping. At the same time, the rubber pads can evenly distribute the pressure applied by the clamping jaw on the surface of the sand box, avoiding excessive local pressure.
[0039] Preferably, the sensor is an infrared sensor or a pressure sensor; the infrared sensor generally consists of an infrared emitter tube and an infrared receiver tube; when the clamping jaw approaches the sand box, the infrared emitter tube emits infrared light, and if the sand box is in the right position, the light will be reflected back to the receiver tube; by detecting the intensity, time and other parameters of the reflected light, the distance and relative position relationship between the clamping jaw and the sand box can be determined, and a signal is sent to the controller when the preset value is reached to complete the centering. Its advantages are non-contact measurement, avoiding damage to the surface of the sand box, fast response speed and strong anti-interference ability, and it can adapt to the complex environment of the foundry workshop; the pressure sensor is installed on the clamping surface of the clamping jaw, and when the clamping jaw clamps the sand box, it can sense the reaction force generated by the sand box; as the clamping force increases, when the pressure value reaches the preset threshold, the sensor sends a signal to the controller to stop the action of the opening and closing mechanism. This sensor can directly reflect the clamping force, has high reliability, is less affected by external environmental factors, and can also achieve accurate control of the clamping force of the sand box, improving the centering accuracy and stability.
[0040] Preferably, the controller is a PLC controller or a single-chip microcomputer controller; the PLC controller has high reliability, can adapt to the complex environment of the foundry, is easy to program, has rich interfaces, is convenient to connect various components for overall control, and has powerful fault diagnosis function, which can reduce downtime; the single-chip microcomputer controller has small size, low cost and high integration, and flexible programming, which can adjust the centering parameters according to different sand box specifications to realize personalized control, and is suitable for scenes with cost and space requirements.
[0041] Preferably, the control unit 5 also includes a wireless communication module connected with a remote control terminal to realize remote control and data transmission; the wireless communication module has signal transceiving function. It follows a specific wireless communication protocol to encode and send out the running state and parameter data of the sand box centering device processed by the controller in the form of wireless signal, and the remote control terminal is also equipped with a corresponding wireless communication module to receive and decode these signals for display; conversely, the control instructions issued by the operator on the remote control terminal will also be received by the wireless communication module in the form of wireless signal and transmitted to the controller to control the action of each component of the sand box centering device, improving the convenience and flexibility of operation.
[0042] The utility model discloses a sand box centering device, when working, first according to the height, size etc. specification of the sand box to be centered, input corresponding parameter on the operation panel, the controller receives parameter, and according to preset program handles and stores, provides the basis for subsequent operation, the controller 51 is according to the sand box height parameter of input, sends the start instruction to the lift motor 22, and the lift motor 22 starts operation, and power is given to the lifting platform 21 through the transmission structure and moves steadily under the guidance of the guide column 11 along the vertical direction, when the lifting platform 21 moves to the position that is adapted to the sand box height, sensor detects the position signal and feeds back to the controller 51, and the controller 51 sends out the instruction and makes the lift motor 22 stop operation, and completes height adjustment, the controller 51 sends the start signal to the transverse drive motor 312, and the transverse drive motor 312 starts to rotate, and drives the transverse screw rod 313 to rotate, and when the screw rod rotates, two transverse sliding blocks 311 that cooperate with the screw rod thread move along the transverse guide rail 314, and the transverse sliding block 311 drives the transverse clamp jaw 32 installed on it to move to the lateral two sides of the sand box, and the sensor installed on the transverse clamp jaw 32 monitors the distance or contact pressure with the sand box in real time, when the transverse clamp jaw 32 approaches the sand box and reaches the appropriate distance or contact pressure reaches the preset value, sensor will signal feedback to the controller 51, and the controller 51 receives the feedback signal, and sends out the instruction and makes the transverse drive motor 312 stop rotating, when the transverse clamp jaw 32 stops moving and clamps the sand box, and completes the transverse centering, after the transverse centering is completed, the controller 51 sends the start instruction to the longitudinal drive motor 413, and the longitudinal drive motor 413 drives the longitudinal screw rod 414 to rotate, and when the screw rod cooperates with two longitudinal sliding blocks 412, moves along the longitudinal guide rail 415, and the longitudinal sliding block 412 drives the longitudinal clamp jaw 42 to move to the longitudinal two sides of the sand box, and the sensor installed on the longitudinal clamp jaw 42 monitors the state with the sand box in real time, when the longitudinal clamp jaw 42 contacts the sand box and satisfies the preset condition, sensor will signal feedback to the controller 51, and the controller 51 controls the longitudinal drive motor 413 to stop rotating according to the feedback signal, and the longitudinal clamp jaw 42 stops moving and clamps the sand box, and completes the longitudinal centering, the wireless communication module in the control unit 5 carries out encoding processing to each data in the sand box centering process, and sends to the remote control terminal in the form of wireless signal, and the operating personnel can view the equipment operation data in real time on the remote control terminal, if finds the abnormality or needs to adjust the parameter, can send the control instruction through the remote control terminal, and the wireless communication module receives the instruction and passes to the controller 51, and the controller 51 adjusts the equipment according to the instruction, after centering, the controller 51 comprehensively transverse and longitudinal centering data, judges whether the sand box reaches the preset centering accuracy requirement, if satisfies the requirement, sends the centering success signal, and the controller 51 controls the transverse drive motor 312 and longitudinal drive motor 413 to reverse, makes the transverse clamp jaw 32 and longitudinal clamp jaw 42 loosen the sand box, removes the sand box from the centering station, and carries out the subsequent casting process operation.
[0043] The installation mode, connection mode or setting mode of the sand box centering device are common mechanical modes, and any mode that can achieve the beneficial effects can be implemented.
[0044] The above is only the preferred embodiment of the present application, and it should be pointed out that for ordinary skilled in the art, without departing from the technical principles of the present application, a number of improvements and modifications can be made, and these improvements and modifications should be considered as the protection scope of the present application.
Claims
1. A sand box centering device, characterized by, The utility model relates to a sand box centering device, including: Frame (1), the centering station is enclosed, the guiding column (11) is equipped in the centering station, Height adjusting assembly (2), including lifting platform (21) and lifting motor (22), the lifting platform (21) horizontal arrangement is connected in the centering station and is slid in the guiding column (11), the lifting platform (21) drive lifting platform (21) moves to adapt to the sand box of different height, Transverse centering assembly (3) and longitudinal centering assembly (4) are installed in the lifting platform (21) lower surface, the transverse centering assembly (3) includes transverse open-close mechanism (31) and two transverse clamping jaws (32), the longitudinal centering assembly (4) includes longitudinal open-close mechanism (41) and two longitudinal clamping jaws (42), for clamping the transverse and longitudinal two sides of sand box, Control unit (5), including controller, sensor and operation panel, the sensor is installed on the transverse clamping jaw (32) and the longitudinal clamping jaw (42), the controller is connected with sensor, operation panel, lifting motor (22), transverse open-close mechanism (31) and longitudinal open-close mechanism (41).
2. The sand box centering device of claim 1, wherein, The transverse open-close mechanism (31) includes two transverse sliding blocks (311), transverse drive motor (312) and transverse screw rod (313), the transverse screw rod (313) is through the transverse sliding block (311) and is threadedly matched with the transverse sliding block (311), two segments of opposite directions screw threads are symmetrically arranged on the transverse screw rod (313), two the transverse sliding block (311) is symmetrically arranged on two segments of screw threads, the transverse drive motor (312) is connected with one end of the transverse screw rod (313), and the transverse clamping jaw (32) is installed on the transverse sliding block (311).
3. The sand box centering device of claim 2, wherein, The longitudinal open-close mechanism (41) includes support (411) and two longitudinal sliding blocks (412) installed on the bottom of the support (411), longitudinal drive motor (413) and longitudinal screw rod (414), the support (411) is installed between two the transverse sliding block (311), the support (411) is provided with the hole for the transverse screw rod (313) to give room, the longitudinal screw rod (414) is through the longitudinal sliding block (412) and is threadedly matched with the longitudinal sliding block (412), two segments of opposite directions screw threads are symmetrically arranged on the longitudinal screw rod (414), two the longitudinal sliding block (412) is symmetrically arranged on two segments of screw threads, the longitudinal drive motor (413) is connected with one end of the longitudinal screw rod (414), and the longitudinal clamping jaw (42) is installed on the longitudinal sliding block (412).
4. The sand box centering device of claim 3, wherein, The two sides of the transverse screw rod (313) are provided with transverse guide rails (314), and the transverse sliding block (311) is slidably connected with the transverse guide rails (314); the two sides of the longitudinal screw rod (414) are provided with longitudinal guide rails (415), and the longitudinal sliding block (412) is slidably connected with the longitudinal guide rails (415).
5. The sand box centering device of claim 4, wherein, The both ends of the transverse guide rails (314) and the longitudinal guide rails (415) are provided with limiters.
6. The sand box centering device of claim 1 wherein, The clamping surfaces of the transverse clamping jaw (32) and the longitudinal clamping jaw (42) are provided with rubber pads.
7. The sand box centering device of claim 1 wherein, The sensor is an infrared sensor or a pressure sensor.
8. The sand box centering device of claim 1 wherein, The controller is a PLC controller or a single-chip microcomputer controller.
9. The sand box centering device of claim 1 wherein, The control unit (5) further comprises a wireless communication module connected with a remote control terminal to realize remote control and data transmission.