A large tank weld grinding machine

Abstract

The present invention discloses a large tank weld grinding machine, which includes a base plate support, a grinding mechanism, a horizontal moving mechanism, a bracket and a control system arranged on the bracket. The brackets are respectively fixed vertically on the upper surfaces of both ends of the base plate support, a horizontal support beam is fixed above the base plate support and between the top ends of the brackets at both ends, a horizontal support beam is installed on the horizontal support beam, a grinding mechanism extending to the bottom of the center of the base plate support is arranged below the horizontal support beam, the grinding mechanism is connected to the horizontal support beam through the horizontal moving mechanism, and the control system is electrically connected to the grinding mechanism and the horizontal moving mechanism respectively. The grinding machine of the present invention can move in all directions and control the grinding head to move forward, backward and up and down, so that the weld grinding is more uniform, has a good grinding effect, and has no dead angles, which solves the problems of large labor and low efficiency of manual grinding.

Description

Technical Field

[0001] The invention belongs to the technical field of storage tank grinding mechanical equipment, and in particular relates to a large tank body weld grinding machine. Background Art

[0002] In recent years, large tanks have been widely used in the fields of petrochemicals, metallurgy, etc. to store various media. If there are cracks, holes and other defects in the welds of large tanks, the welds may break, and the dangerous media in the container will leak, causing immeasurable consequences. Therefore, in order to ensure the safe use of large storage tanks, it is necessary to grind and detect defective welds on their surfaces on time. At present, in domestic mechanical processing production, the grinding of most defective welds is mainly done by manual grinding. Manual grinding is time-consuming, labor-hazardous, and the grinding effect is uneven. Manual work has the disadvantages of slow efficiency, high labor-hazardous coefficient, and uneven grinding effect. Therefore, a device that can move on the wall of a large container and perform grinding work on the wall is designed to replace manual work, improve grinding efficiency, and reduce labor costs. It has high practical value and market promotion significance. Summary of the invention

[0003] The purpose of the present invention is to provide a large tank weld grinding machine, which can move in all directions and control the grinding head to move forward, backward and up and down, so that the weld can be ground more evenly, with good grinding effect and no dead angle, solving the problem of large labor and low efficiency of manual grinding. In order to achieve the above purpose, the invention adopts the following technical effects:

[0004] According to one aspect of the present invention, there is provided a large tank weld grinding machine, which includes a base plate support, a grinding mechanism, a horizontal moving mechanism, a bracket and a control system arranged on the bracket, wherein the brackets are vertically fixed on the upper surfaces at both ends of the base plate support, a horizontal support beam is fixed above the base plate support and between the top ends of the brackets, a horizontal moving mechanism is installed on the horizontal support beam, and a grinding mechanism extending to the bottom of the center of the base plate support is arranged below the horizontal support beam, the grinding mechanism is connected to the horizontal support beam through the horizontal moving mechanism, and the control system is electrically connected to the grinding mechanism and the horizontal moving mechanism, respectively.

[0005] The above scheme of the present invention is further preferred, that rolling wheels are arranged at the bottom of both ends of the base plate support, and a mobile drive motor is transmission-connected to the central axis of each rolling wheel, and the output shaft of the mobile drive motor is transmission-connected to the central axis of the rolling wheel via a diaphragm coupling, and at least one magnet is respectively arranged on the lower surface of the base plate support between adjacent rolling wheels, and the base plate support is relatively slidably arranged on the magnet, and the control system is electrically connected to the mobile drive motor.

[0006] The above solution of the present invention is further preferably provided with a buffer block on the surface of the magnet.

[0007] The above scheme of the present invention is further preferred, wherein the horizontal movement mechanism includes a translation drive motor, a translation screw and a translation screw nut, the translation screw is arranged in parallel along the lower side of the horizontal support beam, the translation drive motor is fixed on the outer bracket at one end of the horizontal support beam, the translation drive motor is transmission-connected to the end of the translation screw, the translation screw nut is sleeved on the translation screw under the horizontal support beam, a lifting mechanism is arranged under the translation screw nut, the outer wall of the translation screw nut is fixedly connected to the lifting mechanism through a connecting plate, and a grinding mechanism extending to the lower side of the center of the base plate support is arranged on the lifting mechanism, the control system includes a controller, a wireless communication module and a laser ranging sensor arranged on both sides of the translation screw nut, and the wireless communication module, the laser ranging sensor and the translation drive motor are electrically connected to the controller respectively.

[0008] The above scheme is further preferred, that the grinding mechanism includes a grinding motor, a grinding impeller and a first lifting plate, the grinding motor and the first lifting plate are respectively connected to the lifting mechanism, a buffer support plate coaxially connected is provided below the first lifting plate, the grinding impeller is provided below the buffer support plate and below the center of the bottom plate support, an ultrasonic ranging sensor is provided on the lower surface of the buffer support plate, the ultrasonic ranging sensor is electrically connected to the controller, a spline shaft is provided through the center of the first lifting plate and the buffer support plate, the upper end of the spline shaft extends upward to the top of the first lifting plate and is transmission-connected to the output shaft of the grinding motor, and the lower end of the spline shaft is transmission-connected to the center of the grinding impeller.

[0009] The above scheme is further preferred, in which a spline sleeve is sleeved on the upper end of the spline shaft, a first coupling is connected to the output shaft of the grinding motor, and the output shaft of the grinding motor is connected to the upper end of the spline shaft through the first coupling and the spline sleeve.

[0010] The above scheme is further preferred, wherein the first lifting plate and the buffer support plate are connected by a plurality of vertical connecting bolts, a shock-absorbing spring is sleeved on each bolt, a diamond bearing seat sleeved on the spline shaft is provided on the lower surface of the buffer support plate, the lower end of the spline shaft passes through the buffer support plate and the diamond bearing seat in sequence and is sleeved with a connecting sleeve, the center of the grinding impeller is fixed to the outer wall of the lower end of the spline shaft through the connecting sleeve, and an outer pressure plate is provided at the lower end of the spline shaft and at the center of the grinding impeller, and the outer pressure plate is respectively fixed to the grinding impeller and the spline shaft by bolts.

[0011] The above scheme is further preferred, the lifting mechanism comprises a lifting drive motor, a lifting fixed plate, a second lifting plate and a lifting screw rod, the lifting fixed plate and the second lifting plate are arranged parallel to each other from top to bottom below the translation screw rod nut, the upper surface of the lifting fixed plate is fixedly connected to the translation screw rod nut by a connecting plate, and a pair of lifting screw rods are successively penetrated through the lifting fixed plate, the second lifting plate and the first lifting plate from top to bottom, the lifting drive motor is fixed above the upper end of one of the lifting screw rods, and the upper ends of the pair of lifting screw rods are respectively provided with sprockets after passing through the upper end of the lifting fixed plate upward, and the sprockets at the upper ends of the pair of lifting screw rods are connected by roller chain transmission, the output shaft of the lowering drive motor is transmission connected to one of the lifting screw rods through the second coupling, the lower ends of the pair of lifting screw rods are respectively connected to the grinding mechanism, and the first lifting plate and the second lifting plate are respectively transmission connected to the lifting screw rod by corresponding lifting screw rod nuts.

[0012] The above scheme is further preferred that guide rods penetrating the lifting and fixing plate, the second lifting plate and the first lifting plate are respectively arranged on both sides of the roller chain and close to each lifting screw rod, the upper end of the guide rod is fixed to the lifting and fixing plate, the lower end of the guide rod is guided and slidably arranged on the first lifting plate, and the second lifting plate and the guide rod are connected by a guide seat.

[0013] The above solution is further preferred in that tension springs connected to the corresponding side brackets are respectively provided on both sides of the front and rear ends of the lifting and fixing plate.

[0014] The invention adopts the above technical solution, and the invention has the following technical effects:

[0015] (1) The utility model has good mobility, reliable adsorption performance, sufficient driving performance and a stable mechanical structure, ensuring that the grinder can smoothly grind and test, and the up and down movement of the grinder lifting mechanism can cross a weld of a certain height.

[0016] (2) The utility model adopts the form of distance adsorption. By controlling the changing relationship between the magnetic force of the magnet and the wall distance (i.e., the size of the air gap), the air gap distance at which the grinder can be safely adsorbed is determined, and the magnet and the bottom plate support of the trolley are fixed to form a corresponding distance to achieve distance adsorption.

[0017] (3) The utility model can move in all directions and control the grinding head to move forward, backward and up and down, so that the weld can be ground more evenly, with good grinding effect and no dead angle, thus solving the problem of large labor force and low efficiency of manual grinding. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional structural diagram of a large tank weld grinding machine invented;

[0019] Figure 2 It is a top view of a large tank weld grinding machine invented;

[0020] Figure 3 It is a front view of a large tank weld grinding machine of the present invention;

[0021] Figure 4 This is the control principle diagram of the control system of the present invention.

[0022] Figure 5 It is a schematic diagram of the installation structure of the grinding mechanism of the present invention;

[0023] In the accompanying drawings, a base support 1, a grinding mechanism 2, a horizontal moving mechanism 3, a rolling wheel 4, a magnet 5, a mobile drive motor 6, a lifting mechanism 7, a connecting plate 8, a diaphragm coupling 9, a bracket 10, a horizontal support beam 11, a buffer pad 50, a grinding motor 201, a grinding impeller 202, a first lifting plate 203, a buffer support plate 204, an ultrasonic ranging sensor 204a, a connecting bolt 205, a spline shaft 206, a spline shaft sleeve 207, and a first lifting plate 203. A coupling 208, a shock-absorbing spring 209, a diamond bearing seat 210, a connecting sleeve 211, a translation drive motor 301, a translation screw 302, a translation screw nut 303, a lifting drive motor 701, a lifting fixing plate 702, a second lifting plate 703, a lifting screw 704, a sprocket 705, a roller chain 706, a second coupling 707, a lifting screw nut 708, a guide rod 709, a guide seat 710, and a tension spring 711. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the invention more clearly understood, the invention is further described in detail below with reference to the accompanying drawings and preferred embodiments. However, it should be noted that many details listed in the specification are only for the purpose of enabling the reader to have a thorough understanding of one or more aspects of the invention, and these aspects of the invention can be realized even without these specific details.

[0025] like Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, according to the invention, a large tank weld grinding machine includes a base plate support 1, a grinding mechanism 2, a horizontal moving mechanism 3, a bracket 10 and a control system arranged on the bracket 10. The brackets 10 are respectively fixed vertically on the upper surfaces of both ends of the base plate support 1, and a horizontal support beam 11 is fixed above the base plate support 1 and between the top ends of the brackets 10 at both ends. The horizontal moving mechanism 3 is installed on the horizontal support beam 11, and a grinding mechanism 2 extending to the bottom of the center of the base plate support 1 is arranged below the horizontal support beam 11. The grinding mechanism 2 is connected to the horizontal support beam 11 through the horizontal moving mechanism 3. The control system is electrically connected to the grinding mechanism 2 and the horizontal moving mechanism 3 respectively, fixes the base plate support 1 to the wall of the tank body, and ensures that the horizontal moving mechanism 3 moves back and forth on the horizontal support beam 11 of the bracket 10. During the reciprocating movement of the grinding mechanism 2 with the horizontal moving mechanism 3, the grinding mechanism 2 grinds the long strip weld on the wall. After the grinding is completed, the grinding mechanism 2 is lifted, and the bottom plate support 1 moves to the next weld for grinding. In the present invention, rolling wheels 4 are arranged at the bottom of both ends of the bottom plate support 1, and a mobile drive motor 6 is connected to the central axis of each rolling wheel 4. The output shaft of the mobile drive motor 6 is connected to the central axis of the rolling wheel 4 through a diaphragm coupling 9. At least one magnet 5 is arranged on the lower surface of the bottom plate support 1 between adjacent rolling wheels 4. The magnet is a DC suction cup electromagnet, and its model is BD-P49 / 21; the bottom plate support 1 and the magnet 5 are relatively slidably buckled together, and the magnet 5 is distributed around the bottom of the bottom plate support 1 to provide adsorption force for adsorbing the wall surface, wherein the magnet 5 provides adsorption force for the grinder to adsorb on the wall surface, ensuring that when the drive motor 6 drives the rolling wheel 4 to crawl freely on the wall surface, the rolling wheel 4 drives the bottom plate support 1 to slide relatively on the magnet 5.

[0026] In the present invention, if Figure 1 , Figure 2As shown, the horizontal movement mechanism 3 includes a translation drive motor 301, a translation screw 302 and a translation screw nut 303. The rotatable translation screw 302 is arranged parallel to the bottom of the horizontal support beam 11. The translation drive motor 301 is fixed on the outer bracket 10 at one end of the horizontal support beam 11. The translation drive motor 301 is connected to the end of the translation screw 302 by transmission. The translation screw nut 303 is sleeved on the translation screw below the horizontal support beam 11. A lifting mechanism 7 is arranged below the translation screw nut 303. The outer wall of 3 is fixedly connected to the lifting mechanism 7 through a connecting plate 8, and a grinding mechanism 2 extending to the bottom of the center of the base plate support 1 is arranged on the lifting mechanism 7. The control system includes a controller, a wireless communication module and laser ranging sensors arranged on both sides of the translation screw nut 303. The controller is a PLC controller or a single-chip microcomputer controller, and the wireless communication module is a Bluetooth communication module. The grinder is used to communicate with a mobile phone terminal by setting Bluetooth communication, and the grinder is controlled by an APP on the mobile phone terminal to adjust the operation mode of the grinder. The wireless communication module, laser ranging sensor and translation drive motor 301 are electrically connected to the controller respectively. The laser ranging sensor is used to measure the relative distance between the translation screw nut 303 and the two side brackets 10 when the translation screw 302 moves, and send the acquired relative distance to the controller for judgment and analysis. The controller thereby controls the translation drive motor 301 to drive the translation screw nut 303 to move the distance on the translation screw 302 between the two side brackets 10. When the controller controls the translation drive motor 301 to drive the translation screw 302 to rotate relatively on the translation screw nut 303, the translation screw nut 303 performs a reciprocating linear translation motion on the translation screw 302 and drives the lifting mechanism 7 and the grinding mechanism 2 below to perform reciprocating translation motion grinding.

[0027] In the present invention, if Figure 1 , Figure 2 , Figure 3 and Figure 5As shown, the grinding mechanism 2 includes a grinding motor 201, a grinding impeller 202 and a first lifting plate 203, the grinding motor 201 and the first lifting plate 203 are respectively connected to the lifting mechanism 7, a buffer support plate 204 is coaxially connected below the first lifting plate 203, the grinding impeller 202 is arranged below the buffer support plate 204 and below the center of the bottom plate support 1, an ultrasonic ranging sensor 204a is arranged on the lower surface of the buffer support plate 204, the ultrasonic ranging sensor 204a is electrically connected to the controller, a spline shaft 206 is arranged through the center of the first lifting plate 203 and the buffer support plate 204, the upper end of the spline shaft 206 extends upward to the top of the first lifting plate 203 and is transmission-connected to the output shaft of the grinding motor 201, and the lower end of the spline shaft 206 is transmission-connected to the center of the grinding impeller 202. A spline sleeve 207 is sleeved on the upper end of the spline shaft 206, and a first coupling 208 is connected to the output shaft of the grinding motor 201. The output shaft of the grinding motor 201 is connected to the upper end of the spline shaft 206 through the first coupling 208 and the spline sleeve 207. The first lifting plate 203 and the buffer support plate 204 are connected by a plurality of vertical connecting bolts 205, and a shock absorbing spring 209 is sleeved on each bolt. A diamond bearing seat 210 sleeved on the spline shaft 206 is provided on the lower surface of the buffer support plate 204. The lower end of the spline shaft 206 passes through the buffer support plate 204 and the diamond bearing seat 210 in turn and is sleeved with a connecting sleeve 211. The center of the grinding impeller 202 is fixed to the spline through the connecting sleeve 210. On the outer wall of the lower end of the shaft 206, an outer pressure plate 211 is provided at the lower end of the spline shaft 206 and located at the center of the grinding impeller 202. The outer pressure plate 211 is respectively fixed to the grinding impeller 202 and the spline shaft 206 by bolts, and the grinding impeller 202 is fastened to the lower end of the spline shaft 206 through the outer pressure plate 211; when the grinding motor 201 outputs torque, since the grinding motor 201 is connected to the spline sleeve 207 through the first coupling 208, and the spline shaft 206 is connected to the spline sleeve 207, the spline shaft 206 is driven to rotate, and the spline shaft 206 is connected to the grinding impeller 202 (grinding head) at the lower end, so the grinding impeller 202 (grinding head) also rotates, and the long weld is ground during the rotation of the grinding head. A shock-absorbing spring 209 is installed under the first lifting plate 203 above the grinding head. When the grinding impeller 202 (grinding head) performs grinding work, the generated vibration and reaction force are transmitted to the shock-absorbing spring 209 and absorbed by the shock-absorbing spring 209, thereby reducing the impact of the vibration and reaction force on the grinding motor.When the lifting mechanism 7 is lifted or lowered, the grinding impeller 202 (grinding head) is driven to lift or lower together. Since the spline shaft connected to the grinding impeller 202 (grinding head) is not actually completely constrained and can move within a certain range in the Z-axis direction, when the first lifting plate 203 moves up and down, the spline shaft 206 and the grinding impeller 202 (grinding head) can follow and complete the lifting or lowering.

[0028] In the present invention, if Figure 1 , Figure 2 , Figure 3 As shown, the lifting mechanism 7 includes a lifting drive motor 701, a lifting fixed plate 702, a second lifting plate 703 and a lifting screw 704. The lifting fixed plate 702 and the second lifting plate 703 are arranged parallel to each other from top to bottom below the translation screw nut 303. The upper surface of the lifting fixed plate 702 is fixedly connected to the translation screw nut 303 through a connecting plate 8. A pair of lifting screws 704 are successively arranged on the lifting fixed plate 702, the second lifting plate 703 and the first lifting plate 203 from top to bottom. A lifting screw 704 is fixed above the upper end of one of the lifting screws 704. The lifting drive motor 701 is fixed, and the upper ends of a pair of lifting screw rods 704 are respectively provided with sprocket wheels 705 after passing upward from the top of the lifting fixed plate 702. The sprocket wheels 705 at the upper ends of the pair of lifting screw rods 704 are connected by roller chains 706. The output shaft of the lowering drive motor 701 is connected to one of the lifting screw rods 704 by a coupling 707. The lower ends of the pair of lifting screw rods 704 are respectively connected to the grinding mechanism 2. The first lifting plate 203 and the second lifting plate 703 are respectively connected to the lifting screw rods 704 by corresponding lifting screw rod nuts 708. , the lifting drive motor 701 drives the lifting screw 704 to rotate, and the adjacent lifting screws rotate synchronously through the roller chain 706, so that the lifting screw nuts 708 correspondingly arranged on the first lifting plate 203 and the second lifting plate 703 synchronously drive the corresponding lifting plates to move up and down, thereby adjusting and controlling the grinding mechanism 2 to move up and down, and grinding welding marks of different heights; guide rods 709 are respectively arranged on both sides of the roller chain 706, which penetrate the lifting fixed plate 702, the second lifting plate 703 and the first lifting plate 203, and the upper ends of the guide rods 709 are fixed to the lifting fixed plate On the fixed plate 702, the lower end guide sliding of the guide rod 707 is set on the first lifting plate 203, and the second lifting plate 703 is connected to the guide rod 709 through a guide seat 710. Tension springs 711 connected to the corresponding side bracket 10 are respectively arranged on both sides of the front and rear ends of the lifting fixed plate 702, so as to ensure that when the grinding mechanism 2 moves in the front and rear directions (X-axis direction) and up and down (Z-axis direction) or vibrates during the grinding process, it can play a good buffering role in the X-axis direction, so that the entire grinding mechanism 2 can maintain a reciprocating buffering and shock absorption at the same horizontal height.

[0029] In the present invention, combined with Figures 1 to 5 , the distance between the grinding head and the tank wall is detected by the ultrasonic distance sensor 204a and the detected distance is sent to the controller. The controller controls the gap between the grinding impeller 202 (grinding head) and the tank container wall by controlling the lifting drive motor 701. Since the mobile drive motor 6 drives the rolling wheel 4 to drive the bottom plate support 1 to move, the rolling wheel 4 needs to move on the wall of the tank container during the rotation process, and the wall of the tank container is not smooth enough. In order to avoid the grinding impeller 202 (grinding head) colliding with the protruding obstacles on the wall during the moving grinding process and damaging the grinding impeller 202 (grinding head), therefore, when the grinding work is not performed, the lifting mechanism 7 should lift the grinding impeller 202 (grinding head) a certain distance to avoid affecting the grinding machine. A lifting screw 704 is used on each lifting fixed plate 702 at both ends of the lifting mechanism 7 to drive the second lifting plate 703 in the middle to complete the lifting. In order to make the two lifting screws 704 rotate synchronously and move the second lifting plate 703 in unison during lifting, the power transmission of the lifting drive motor 701 is used on the lifting screw 704, so that the two lifting screws 704 rotate at the same time, and the speed of the lifting screw 704 is relatively low, which is 50r / min. In addition, since the working environment of the large tank container is relatively complex, the reliability of the chain transmission working mode is stronger, so the roller chain 706 is selected for the power transmission of the two lifting screws 704. Due to the large grinding area, in order to ensure the stability of the first lifting plate 203 and the second lifting plate 703 when moving, and to protect the ball screw and share the inertial impact of the ball screw, two guide rods 709 are added next to the lifting screw 704. The lifting drive motor 701 is connected to one of the screws through the second coupling 707, and the two screws are connected by a roller chain 706. When the shaft of the lifting drive motor 701 rotates, it drives one of the lifting screws 704 to rotate. Since the two lifting screws 704 are connected by a roller chain 706, the roller chain drives the screw on the other side to rotate, so that the two lifting screws rotate synchronously. When the two lifting screws rotate, the lifting screw nut 708 drives the second lifting plate 703 (and the first lifting plate 203 at the same time) to move up and down along the lifting screw. Since the lifting screw nut 708 is connected to the second lifting plate 703, when the lifting screw rotates, the lifting screw nut 708 and the first lifting plate 702 move on the screw.

[0030] Combination Figures 1 to 5, the working process of grinding the weld of a large tank body by using the grinder of the present invention is further described. After the machine is powered on, the operator sends a command to the controller through the Bluetooth communication module of the mobile phone terminal, and the controller sends an operation signal to the corresponding components of the grinding mechanism 2, the horizontal moving mechanism 3, and the lifting mechanism 7. The magnet 5 is energized to ensure that the grinder can overcome gravity and be adsorbed on the metal wall of the large tank body, and the mobile drive motor 6 controls the rolling wheel 4 to move on the surface of the large tank body. During operation, when the grinding impeller 202 (grinding head) of the grinder runs to the weld, the lifting screw 704 of the lifting mechanism 7 drives the grinding impeller 202 (grinding head) to move downward, and the grinding motor 201 of the grinding mechanism 2 drives the grinding impeller 202 (grinding head) to start grinding. At the same time, the translation drive motor 6 of the horizontal moving mechanism 3 drives the translation screw 302 to rotate, and the translation screw nut 303 on the translation screw 302 drives the grinding mechanism 2 to grind the long strip weld. After the grinding is completed, the lifting mechanism 7 lifts the grinding impeller 202 (grinding head), and the translation drive motor 301 drives the bottom plate support 1 to move to the next weld for grinding by driving the rolling wheel 4.

[0031] The above is only a preferred embodiment of the invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the invention. These improvements and modifications should also be regarded as the scope of protection of the invention.

Claims

1. A large tank weld grinding machine, characterized by: The grinding machine comprises a base plate support, a grinding mechanism, a horizontal moving mechanism, a bracket and a control system arranged on the bracket, the brackets are respectively vertically fixed on the upper surfaces of both ends of the base plate support, a horizontal support beam is fixed above the base plate support and between the top ends of the brackets at both ends, the horizontal moving mechanism is installed on the horizontal support beam, a grinding mechanism extending to the bottom of the center of the base plate support is arranged below the horizontal support beam, the grinding mechanism is connected to the horizontal support beam through the horizontal moving mechanism, and the control system is respectively electrically connected to the grinding mechanism and the horizontal moving mechanism; Rolling wheels are arranged at the bottom of both ends of the bottom plate support, and a mobile driving motor is connected to the central axis of each rolling wheel in a transmission manner. The output shaft of the mobile driving motor is connected to the central axis of the rolling wheel through a diaphragm coupling. At least one magnet is arranged on the lower surface of the bottom plate support between adjacent rolling wheels. The bottom plate support is relatively slidably arranged on the magnet. The magnet adopts a DC suction cup type electromagnet. The control system is electrically connected to the mobile driving motor. The horizontal movement mechanism includes a translation drive motor, a translation screw and a translation screw nut. The translation screw is arranged parallel to the bottom of the horizontal support beam. The translation drive motor is fixed on the outer bracket at one end of the horizontal support beam. The translation drive motor is transmission-connected with the end of the translation screw. The translation screw nut is sleeved on the translation screw under the horizontal support beam. A lifting mechanism is arranged below the translation screw nut. The outer wall of the translation screw nut is fixedly connected to the lifting mechanism through a connecting plate. A grinding mechanism extending to the bottom of the center of the base plate support is arranged on the lifting mechanism. The control system includes a controller , a wireless communication module and a laser ranging sensor arranged on both sides of the translation screw nut, the wireless communication module, the laser ranging sensor and the translation drive motor are electrically connected to the controller respectively; the grinding mechanism includes a grinding motor, a grinding impeller and a first lifting plate, the grinding motor and the first lifting plate are respectively connected to the lifting mechanism, a buffer support plate is coaxially connected below the first lifting plate, the grinding impeller is arranged below the buffer support plate and below the center of the bottom plate support, an ultrasonic ranging sensor is arranged on the lower surface of the buffer support plate, and the ultrasonic ranging sensor is electrically connected to the controller; The lifting mechanism comprises a lifting drive motor, a lifting fixed plate, a second lifting plate and a lifting screw rod, the lifting fixed plate and the second lifting plate are arranged parallel to each other from top to bottom below the translation screw rod nut, the upper surface of the lifting fixed plate is fixedly connected to the translation screw rod nut through a connecting plate, a pair of lifting screw rods are successively penetrated through the lifting fixed plate, the second lifting plate and the first lifting plate from top to bottom, the lifting drive motor is fixed above the upper end of one of the lifting screw rods, and the upper ends of the pair of lifting screw rods are respectively provided with sprocket wheels after passing through the upper end of the lifting fixed plate upward, the sprocket wheels at the upper ends of the pair of lifting screw rods are connected by roller chain transmission, and the output shaft of the lowering drive motor is connected through The second coupling is connected to one of the lifting screws for transmission, the lower ends of the pair of lifting screws are respectively connected to the grinding mechanism, and the first lifting plate and the second lifting plate are respectively connected to the lifting screws through corresponding lifting screw nuts; guide rods penetrating the lifting fixed plate, the second lifting plate and the first lifting plate are respectively arranged on both sides of the roller chain and close to each lifting screw, the upper end of the guide rod is fixed to the lifting fixed plate, the lower end of the guide rod is guided and slidably arranged on the first lifting plate, and the second lifting plate and the guide rod are connected through a guide seat; tension springs connected to the corresponding side brackets are respectively arranged on both sides of the front and rear ends of the lifting fixed plate.

2. A large tank weld grinding machine according to claim 1, characterized in that: A buffer block is arranged on the surface of the magnet.

3. A large tank weld grinding machine according to claim 1, characterized in that: A spline shaft is provided through the center of the first lifting plate and the buffer support plate, the upper end of the spline shaft extends upward to the top of the first lifting plate and is transmission-connected to the output shaft of the grinding motor, and the lower end of the spline shaft is transmission-connected to the center of the grinding impeller.

4. A large tank weld grinding machine according to claim 3, characterized in that: A spline sleeve is sleeved on the upper end of the spline shaft, and a first coupling is connected to the output shaft of the grinding motor. The output shaft of the grinding motor is connected to the upper end of the spline shaft through the first coupling and the spline sleeve.

5. A large tank weld grinding machine according to claim 3, characterized in that: The first lifting plate and the buffer support plate are connected by multiple vertical connecting bolts, and a shock-absorbing spring is sleeved on each bolt. A diamond bearing seat sleeved on the spline shaft is provided on the lower surface of the buffer support plate, and the lower end of the spline shaft passes through the buffer support plate and the diamond bearing seat in sequence and is sleeved with a connecting sleeve. The center of the grinding impeller is fixed to the outer wall of the lower end of the spline shaft through the connecting sleeve, and an outer pressure plate is provided at the lower end of the spline shaft and at the center of the grinding impeller. The outer pressure plate is respectively fixed to the grinding impeller and the spline shaft by bolts.

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