Valve casting turning equipment and method

Abstract

The invention relates to the technical field of valve machining, in particular to valve casting turning equipment and method.The valve casting turning equipment comprises a machine base, a containing bin arranged on the machine base, a machining table movably connected into the containing bin and a machine frame installed on the machine base; a driver used for driving the machining table to rotate and ascend and descend is installed in the containing bin. The machine further comprises a guide rod installed on the machine frame, a shifting assembly installed on the machine frame, an adjusting assembly installed on the shifting assembly, a lifting assembly installed on the adjusting assembly and a conversion assembly installed on the lifting assembly. Through the linkage effect between the lifting assembly and the conversion assembly, only when the lifting assembly is started, the linkage assembly can be started, turning tools are switched, the situation that equipment is damaged due to equipment program faults or misoperation of workers is avoided, and the use safety is greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of valve processing, and in particular to a valve casting turning device and method. Background Art

[0002] During the production process, the valve body cast by the valve needs to be cut to make the two connecting end faces of the valve body smoother, so as to ensure stable sealing installation during installation and improve the use effect and life of the valve. At present, the turning device for the valve is basically turned by horizontal or vertical turning machine tools.

[0003] When turning the valve end face, it is necessary to first use a rough tool for turning, and then manually replace the fine tool for more precise turning after turning is completed. This tool changing operation is basically manual operation. The existing Chinese invention patent with publication number CN118253806A discloses a turning device for valve production, which is used to automatically and accurately replace the turning tool. However, the tool replacement method adopted by the patent requires first lifting the tool disc in the working area away from the valve casting to be processed to obtain tool changing space, and then continue to reset after changing the tool. This tool changing method has a long operation process and a long tool change stop time. Moreover, because the tool disc lifting and tool replacement use different power control units, once an error operation or a lathe control program failure occurs during the processing process, the tool will start to change the tool without leaving the working area, and the tool will hit the valve casting and the equipment will be damaged.

[0004] Therefore, in view of the lifting method used in the above-mentioned valve turning process to obtain space for replacing the turning tool, the tool changing time is long, and it belongs to a different power system from the tool changing control unit. Once a failure occurs during operation, it is easy to cause damage to the equipment. A swing-type lifting tool changing device can be designed to combine the power of tool changing and the power of lifting. Once the tool change starts, the equipment automatically lifts to avoid equipment damage caused by equipment program failure or misoperation. Summary of the invention

[0005] In order to overcome the lifting structure used in valve turning, the tool change time is long and it belongs to a different power system from the tool change control unit, which makes it easy for the equipment to be damaged due to equipment program failure.

[0006] The technical solution of the present invention is as follows: A turning equipment for valve castings, including a machine base, a placement bin arranged on the machine base, a processing table movably connected in the placement bin, and a frame installed on the machine base. The processing table is used for placing valve castings. A driving machine for driving the rotation and lifting of the processing table is installed in the placement bin. It also includes a guide rod installed on the frame, a displacement assembly installed on the frame, an adjustment assembly installed on the displacement assembly, a lifting assembly installed on the adjustment assembly, and a conversion assembly installed on the lifting assembly; the displacement assembly is used to drive the adjustment assembly to slide along the guide rod, the adjustment assembly is used to drive the lifting assembly and the conversion assembly to move radially along the connecting end face of the valve casting, the lifting assembly is used to drive the conversion assembly to swing up or down, and several turning tools are installed on the conversion assembly. When the lifting assembly swings upward, the conversion assembly aligns one of the turning tools towards the valve casting.

[0007] Preferably, a primary locking assembly and a secondary locking assembly are installed on the processing table. The primary locking assembly is used to limit the connecting end face at the lower end of the valve casting, and the secondary locking assembly is used to limit the connecting end face at the upper end of the valve casting.

[0008] Preferably, the primary locking assembly includes several transmission bins arranged in the processing table, a driving gear movably connected in the corresponding transmission bin, a first motor installed in the corresponding transmission bin, a holding frame slidably connected in the corresponding transmission bin, a linkage gear meshed with the driving gear, and a driven gear meshed with the linkage gear. The driving gear is fixedly installed on the output end of the first motor. The first motor is used to drive the driving gear to rotate. The driving gear is used to transmit power to the linkage gear. The holding frame is provided with a tooth groove and meshes with the driving gear. The driving gear is used to drive the holding frame to slide closer to or away from the connecting end face at the lower end of the valve casting. The linkage gear is used to transmit power to the driven gear.

[0009] Preferably, the secondary locking assembly includes a rack slidably connected to the processing table, a side support plate fixedly connected to one end of the rack, and a side support platform fixedly connected to the side support plate. The rack meshes with the driven gear. The driven gear is used to drive the rack to slide and make the side support plate and the side support platform move closer to or away from the connecting end face at the upper end of the valve casting.

[0010] Preferably, the displacement assembly includes an ear frame fixed to the frame, a screw rod movably connected to the ear frame, a secondary gear fixedly connected to the screw rod, a primary gear movably connected to the frame, a second motor installed on the frame, and a sliding frame threadedly connected to the screw rod. The primary gear is fixedly connected to the output end of the second motor. The second motor is used to drive the primary gear to rotate. The primary gear meshes with the secondary gear. The primary gear is used to drive the secondary gear to rotate. The secondary gear is used to drive the screw rod to rotate. The screw rod is used to drive the sliding frame to axially slide along the guide rod.

[0011] Preferably, the adjusting assembly includes a first cylinder mounted on the carriage and an adjusting seat mounted on the output end of the first cylinder. The first cylinder is used to drive the adjusting seat to move closer to or away from the center of the connection end face of the valve casting.

[0012] Preferably, the lifting assembly includes a third motor mounted on the adjusting seat, a shaft head movably connected in the adjusting seat, a signal transmitting module mounted on the shaft head, and a bevel gear fixedly connected to the shaft head. One end of the shaft head is fixed to the output end of the third motor, and the other end of the shaft head is connected to the bevel gear. The third motor is used to drive the shaft head and the bevel gear to rotate. The bevel gear is used to transmit power to the conversion assembly, and the signal transmitting module is used to detect the rotation state of the shaft head.

[0013] Preferably, the signal transmitting module includes a spring and a torque sensor mounted in the shaft head. The torque sensor is mounted in the shaft head. One end of the spring is connected to the sensing end of the torque sensor, and the other end is connected to the adjusting seat. The torque sensor is used to detect the torsion value of the spring and send a signal to the control unit of the third motor.

[0014] Preferably, the conversion assembly includes a cutter head arranged above the processing table, a column cavity fixedly connected to the cutter head, a bevel gear disk fixedly connected to the column cavity, a second cylinder mounted in the column cavity, and a movable head fixedly connected to the output end of the second cylinder. The cutter head is used to mount a plurality of turning tools. The movable head is movably connected to the shaft head. The second cylinder is used to drive the bevel gear disk to approach or move away from the bevel gear. When the cutter head swings upward, the bevel gear disk meshes with the bevel gear; when the cutter head swings downward, the bevel gear disk disengages from the bevel gear; when turning the valve casting, the bevel gear disk meshes with the bevel gear.

[0015] A method for turning a valve casting uses a valve casting turning device as described above, and includes the following steps:

[0016] S1: Place the valve casting into the processing table, and expose the connection end face at its upper end above the processing table.

[0017] S2: Start the second motor in the shifting assembly. Through the meshing transmission of the spur gear and the secondary gear, the screw rotates. With the guiding function of the guide rod, the carriage moves from one side of the screw to the middle of the screw, directly facing the center position of the valve casting. At this time, the lifting assembly and the conversion assembly are in place.

[0018] S3: The first motor in the primary locking assembly starts. Through the rotation of the driving gear, the abutting frame is driven to extend obliquely downward from the transmission chamber and abut against the connecting end face at the lower end of the valve casting, locking the valve casting in the processing table. At the same time, due to the meshing transmission among the linkage gear, the driven gear, and the rack, the side support plate and the side support platform also move synchronously towards the connecting end face at the upper end of the valve casting as the abutting frame moves, until the connecting end face at the upper end of the valve casting is locked. In this way, the valve casting is prevented from shaking and rotating in the processing table by means of frictional locking;

[0019] S4: According to the turning requirement, start the third motor in the lifting assembly, control the shaft head and the bevel gear to rotate, drive the conversion assembly to swing upward, and utilize the meshing transmission between the bevel gear and the bevel gear disc to rotate the tool disc synchronously and adjust the direction of the turning tool on it until the appropriate turning tool faces downward. At this time, the torque sensor in the signal sending module detects the torque signal of the spring;

[0020] S5: The torque sensor sends the signal to the control units of the third motor and the second air cylinder. The second air cylinder starts first, controls the column cavity and the movable head to move away. At the same time, the bevel gear and the bevel gear disc disengage. Then the third motor controls the shaft head to rotate back to the initial state. After the torque signal of the spring disappears, the second air cylinder starts again, controls the column cavity to approach the movable head, and makes the bevel gear and the bevel gear disc mesh again;

[0021] S6: Start the drive motor to control the processing table and the locked valve casting to rotate, and the turning tool acts on the valve casting for turning. At the same time, the first air cylinder in the adjustment assembly controls the turning tool to move on the valve casting according to the command, processing from the edge of the valve casting to the center or from the center of the valve casting to the edge.

[0022] Advantages of the present invention:

[0023] 1. Through the linkage effect between the lifting assembly and the conversion assembly, only when the lifting assembly starts will the linkage assembly start to switch the turning tool, avoiding automatic turning tool switching without a proper tool-changing space due to equipment program failures or worker misoperations, preventing equipment damage, and greatly improving the use safety;

[0024] 2. By using the cooperation of the primary locking assembly and the secondary locking assembly, two end faces of the valve casting can be locked simultaneously through one power source, and the locking is very efficient and fast. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 The three-dimensional structural schematic diagram of the valve casting turning equipment of the present invention is shown;

[0026] Figure 2 The front cross-sectional view of the valve casting turning equipment of the present invention is shown;

[0027] Figure 3 The figure shows a schematic side-sectional view of the turning equipment for valve castings of the present invention;

[0028] Figure 4 The figure shows a schematic view of the structure of the processing table of the turning equipment for valve castings of the present invention;

[0029] Figure 5 The figure shows a schematic view of the structure of the primary locking component and the secondary locking component of the turning equipment for valve castings of the present invention;

[0030] Figure 6 The figure shows a first schematic view of the displacement component and the position adjustment component of the turning equipment for valve castings of the present invention;

[0031] Figure 7 The figure shows a second schematic view of the displacement component and the position adjustment component of the turning equipment for valve castings of the present invention;

[0032] Figure 8 The figure shows a first schematic view of the lifting component and the conversion component of the turning equipment for valve castings of the present invention;

[0033] Figure 9 The figure shows a second schematic view of the lifting component and the conversion component of the turning equipment for valve castings of the present invention;

[0034] Figure 10 The figure shows the turning equipment for valve castings of the present invention Figure 3 and an enlarged schematic view at position A in it.

[0035] Explanation of reference numerals: 1, machine base; 2, placement bin; 3, processing table; 4, frame; 5, guide rod; 601, transmission bin; 602, driving gear; 603, first motor; 604, abutting frame; 605, linkage gear; 606, driven gear; 701, rack; 702, side support plate; 703, side support platform; 801, ear rack; 802, screw rod; 803, auxiliary gear; 804, spur gear; 805, second motor; 806, sliding carriage; 901, first cylinder; 902, position adjustment seat; 1001, third motor; 1002, shaft head; 1003, signal sending module; 1004, bevel gear; 1101, cutter head; 1102, column cavity; 1103, bevel gear disk; 1104, second cylinder; 1105, movable head. Detailed implementation manners

[0036] The present invention will be further described below with reference to the drawings and embodiments.

[0037] Please refer to Figures 1-10, the present invention provides an embodiment: a turning device for valve castings, including a machine base 1, a placement bin 2 arranged on the machine base 1, a processing table 3 movably connected in the placement bin 2, and a frame 4 installed on the machine base 1. The processing table 3 is used for placing valve castings. A driving machine for driving the rotation and lifting of the processing table 3 is installed in the placement bin 2. It also includes a guide rod 5 installed on the frame 4, a displacement assembly installed on the frame 4, an adjustment assembly installed on the displacement assembly, a lifting assembly installed on the adjustment assembly, and a conversion assembly installed on the lifting assembly. The displacement assembly is used to drive the adjustment assembly to slide along the guide rod 5. The adjustment assembly is used to drive the lifting assembly and the conversion assembly to move radially along the connecting end face of the valve casting. The lifting assembly is used to drive the conversion assembly to swing upward or downward. A number of turning tools are installed on the conversion assembly. When the lifting assembly swings upward, the conversion assembly aligns one of the turning tools with the valve casting. After placing the valve casting in the processing table 3, the displacement assembly drives the adjustment assembly, the lifting assembly, and the conversion assembly to be in place. According to the processing requirements, the lifting assembly is started to lift the conversion assembly upward, so that there is enough space between the turning tool and the valve casting. At the same time, the operation of the lifting assembly transmits power to the conversion assembly, and the conversion assembly starts to replace the turning tool synchronously. After replacing the appropriate turning tool, the lifting assembly resets. The driving machine controls the rotation of the processing table 3 and the valve casting, so that the turning tool forms a cutting force on the valve casting. During the turning process, the adjustment assembly controls the turning tool to move towards the center or edge of the valve casting to adjust the processing position.

[0038] Please refer to Figures 1-5, in this embodiment, a primary locking assembly and a secondary locking assembly are installed on the processing table 3. The primary locking assembly is used to limit the connection end face at the lower end of the valve casting, and the secondary locking assembly is used to limit the connection end face at the upper end of the valve casting. The primary locking assembly includes a plurality of transmission bins 601 arranged in the processing table 3, a driving gear 602 movably connected in the corresponding transmission bin 601, a first motor 603 installed in the corresponding transmission bin 601, a holding frame 604 slidably connected in the corresponding transmission bin 601, a linkage gear 605 meshed with the driving gear 602, and a driven gear 606 meshed with the linkage gear 605. The driving gear 602 is fixedly installed on the output end of the first motor 603. The first motor 603 is used to drive the driving gear 602 to rotate. The driving gear 602 is used to transmit power to the linkage gear 605. The holding frame 604 is provided with a tooth groove and meshes with the driving gear 602. The driving gear 602 is used to drive the holding frame 604 to slide closer to or away from the connection end face at the lower end of the valve casting. The linkage gear 605 is used to transmit power to the driven gear 606. The secondary locking assembly includes a rack 701 slidably connected to the processing table 3, a side support plate 702 fixedly connected to one end of the rack 701, and a side support platform 703 fixedly connected to the side support plate 702. The rack 701 meshes with the driven gear 606. The driven gear 606 is used to drive the rack 701 to slide and make the side support plate 702 and the side support platform 703 move closer to or away from the connection end face at the upper end of the valve casting. After the valve casting is placed in the processing table 3, the first motor 603 is started to drive the driving gear 602 to rotate. By using the meshing action between the tooth groove on the holding frame 604 and the driving gear 602, the holding frame 604 extends obliquely downward from the transmission bin 601 and abuts against the connection end face at the lower end of the valve casting, squeezing and locking the valve casting in the processing table 3. At the same time, the driving gear 602 transmits power to the linkage gear 605, and the linkage gear 605 then transmits power to the driven gear 606. Through the meshing transmission between the driven gear 606 and the rack 701, the side support plate 702 and the side support platform 703 also move synchronously closer to the connection end face at the upper end of the valve casting as the holding frame 604 moves until the connection end face at the upper end of the valve casting is locked.

[0039] Please refer to Figures 1-3 and Figures 6-7 、 Figure 10, in this embodiment, the shifting component includes an ear frame 801 fixed on the frame 4, a screw rod 802 movably connected to the ear frame 801, a secondary gear 803 fixedly connected to the screw rod 802, a primary gear 804 movably connected to the frame 4, a second motor 805 installed on the frame 4, and a carriage 806 threadedly connected to the screw rod 802. The primary gear 804 is fixedly connected to the output end of the second motor 805. The second motor 805 is used to drive the primary gear 804 to rotate. The primary gear 804 meshes with the secondary gear 803. The primary gear 804 is used to drive the secondary gear 803 to rotate. The secondary gear 803 is used to drive the screw rod 802 to rotate. The screw rod 802 is used to drive the carriage 806 to axially slide along the guide rod 5. The adjusting component includes a first air cylinder 901 installed on the carriage 806 and an adjusting seat 902 installed on the output end of the first air cylinder 901. The first air cylinder 901 is used to drive the adjusting seat 902 to move closer to or away from the center of the connecting end face of the valve casting. After the valve casting is in place, the second motor 805 is started to drive the primary gear 804 to rotate. The primary gear 804 transmits the power to the secondary gear 803, causing the screw rod 802 to rotate. At the same time, the guide rod 5 plays a guiding role because it is inserted into the carriage 806. The carriage 806 moves from one side of the screw rod 802 to the middle of the screw rod 802, directly opposite the center position of the valve casting, and the turning tool is located above the valve assembly.

[0040] Please refer to Figures 1-3 and Figures 6-10, in this embodiment, the lifting assembly includes a third motor 1001 installed on the adjustment seat 902, a shaft head 1002 movably connected within the adjustment seat 902, a signal transmission module 1003 installed on the shaft head 1002, and a bevel gear 1004 fixedly connected to the shaft head 1002. One end of the shaft head 1002 is fixed to the output end of the third motor 1001, and the other end of the shaft head 1002 is connected to the bevel gear 1004. The third motor 1001 is used to drive the shaft head 1002 and the bevel gear 1004 to rotate. The bevel gear 1004 is used to transmit power to the conversion assembly. The signal transmission module 1003 is used to detect the rotation state of the shaft head 1002. The signal transmission module 1003 includes a spring and a torque sensor installed within the shaft head 1002. The torque sensor is installed within the shaft head 1002. One end of the spring is connected to the sensing end of the torque sensor, and the other end is connected to the adjustment seat 902. The torque sensor is used to detect the torsion value of the spring and send a signal to the control unit of the third motor 1001. When it is necessary to replace the cutting tool, an instruction is sent to the control unit of the third motor 1001. The third motor 1001 first controls the shaft head 1002 and the bevel gear 1004 to rotate, driving the conversion assembly to swing upward to create a lower space for the replacement of the cutting tool. During the rotation of the shaft head 1002, the spring is twisted, and at the same time, the torque sensor detects the torque signal of the spring. As the shaft head 1002 continues to rotate, the torque signal also continuously changes. When it is detected that the torque signal reaches the threshold value (consistent with the instruction signal), the third motor 1001 stops running and self-locks, and the shaft head 1002 stops rotating. During the rotation of the shaft head 1002, the replacement action of the cutting tool is completed. Then, the linkage effect between the conversion assembly and the lifting assembly is disconnected, and the third motor 1001 controls the shaft head 1002 to reset and lock again. At this time, the cutting tool is in place.

[0041] Please refer to Figures 1-3 and Figures 8-10, in this embodiment, the conversion component includes a cutter head 1101 disposed above the machining table 3, a column cavity 1102 fixedly connected to the cutter head 1101, a bevel gear disk 1103 fixedly connected to the column cavity 1102, a second cylinder 1104 installed in the column cavity 1102, and a movable head 1105 fixedly connected to the output end of the second cylinder 1104. The cutter head 1101 is used to install a plurality of turning tools. The movable head 1105 is movably connected to the shaft head 1002. The second cylinder 1104 is used to drive the bevel gear disk 1103 to approach or move away from the bevel gear 1004. When the cutter head 1101 swings upward, the bevel gear disk 1103 meshes with the bevel gear 1004; when the cutter head 1101 swings downward, the bevel gear disk 1103 disengages from the bevel gear 1004; when turning the valve casting, the bevel gear disk 1103 meshes with the bevel gear 1004, and the shaft head 1002 rotates upward. During the upward swing of the cutter head 1101, by the meshing transmission of the bevel gear 1004 and the bevel gear disk 1103, the cutter head 1101 rotates synchronously (in practical applications, the length of one revolution of the bevel gear 1004 is greater than the length of one revolution of the bevel gear disk 1103, so that the bevel gear 1004 does not need to rotate a large angle to control the rotation of the bevel gear disk 1103 until the corresponding turning tool thereon is in place), adjust the direction of the turning tool thereon until the appropriate turning tool faces downward. After the turning tool is switched, the second cylinder 1104 is started first, controlling the column cavity 1102 and the movable head 1105 to move away, so that the bevel gear 1004 and the bevel gear disk 1103 disengage, preparing for the reset of the cutter head 1101. The third motor 1001 controls the shaft head 1002 to rotate and reset to the initial state, the torque signal of the spring disappears, and the second cylinder 1104 is started again, controlling the column cavity 1102 to approach the movable head 1105, making the bevel gear 1004 and the bevel gear disk 1103 mesh again, preparing for the next turning tool replacement.

[0042] Please refer to Figures 1-10 , in this embodiment, the present invention provides a method for turning a valve casting, using a valve casting turning device as described above, including the following steps:

[0043] S1: Place the valve casting into the machining table 3, so that the connecting end face at its upper end is exposed above the machining table 3

[0044] S2: Start the second motor 805 in the displacement component. Through the meshing transmission of the spur gear 804 and the secondary gear 803, the screw 802 rotates. With the guiding action of the guide rod 5, the carriage 806 moves from one side of the screw 802 to the middle of the screw 802, directly facing the center position of the valve casting. At this time, the lifting component and the conversion component are in place;

[0045] S3: The first motor 603 in the primary locking assembly starts. Through the rotation of the driving gear 602, it drives the abutting frame 604 to extend obliquely downward from the transmission chamber 601 and abut against the connecting end face at the lower end of the valve casting, locking the valve casting in the processing table 3. At the same time, due to the meshing transmission between the linkage gear 605, the driven gear 606 and the rack 701, the side support plate 702 and the side support platform 703 also move synchronously towards the connecting end face at the upper end of the valve casting as the abutting frame 604 moves, until the connecting end face at the upper end of the valve casting is locked. In this way, the valve casting is prevented from shaking and rotating in the processing table 3 by means of frictional locking;

[0046] S4: According to the turning requirements, start the third motor 1001 in the lifting assembly, control the shaft head 1002 and the bevel gear 1004 to rotate, drive the conversion assembly to swing upward. By the meshing transmission between the bevel gear 1004 and the bevel gear disc 1103, the cutter head 1101 rotates synchronously to adjust the direction of the turning tool on it until the appropriate turning tool faces downward. At this time, the torque sensor in the signal sending module 1003 detects the torque signal of the spring (the rotation angle presets the corresponding torque signal threshold according to the position where the turning tools are distributed. After sending an instruction to the control unit of the third motor 1001, the shaft head 1002 rotates until the corresponding threshold is detected, indicating that the appropriate turning tool is in place, and the shaft head 1002 stops rotating);

[0047] S5: The torque sensor sends the signal to the control units of the third motor 1001 and the second air cylinder 1104. The second air cylinder 1104 starts first, controls the column cavity 1102 to move away from the movable head 1105. At the same time, the bevel gear 1004 and the bevel gear disc 1103 disengage. Then the third motor 1001 controls the shaft head 1002 to rotate back to the initial state. After the torque signal of the spring disappears, the second air cylinder 1104 starts again, controls the column cavity 1102 to approach the movable head 1105, and makes the bevel gear 1004 and the bevel gear disc 1103 mesh again (according to the torque threshold signal of the shaft head 1002 rotating in the previous step, control the shaft head 1002 to rotate in the reverse direction by the same angle and return to the initial position, making the turning tool close to the valve casting);

[0048] S6: Start the drive to control the rotation of the processing table 3 and the locked valve casting (in practical applications, the drive can adopt the combination of a motor and an air cylinder. The motor controls the rotation of the processing table 3 to form a cutting force between the turning tool and the valve casting, and the air cylinder controls the valve casting to be lifted by a certain height to adjust the cutting depth). The turning tool acts on the valve casting for turning. At the same time, the first air cylinder 901 in the adjustment assembly controls the turning tool to move on the valve casting according to the command, processing from the edge of the valve casting to the center or from the center of the valve casting to the edge.

Claims

1. A valve casting turning device, comprising a base (1), a placement bin (2) arranged on the base (1), a processing table (3) movably connected in the placement bin (2), and a frame (4) installed on the base (1), wherein the processing table (3) is used to place the valve casting, and a driving machine for driving the processing table (3) to rotate and lift is installed in the placement bin (2); characterized in that: It also includes a guide rod (5) mounted on the frame (4), a shifting assembly mounted on the frame (4), an adjusting assembly mounted on the shifting assembly, a lifting assembly mounted on the adjusting assembly, and a conversion assembly mounted on the lifting assembly; The shift assembly is used to drive the adjustment assembly to slide along the guide rod (5); the adjustment assembly is used to drive the lifting assembly and the conversion assembly to move radially along the connecting end surface of the valve casting; the lifting assembly is used to drive the conversion assembly to swing upward or downward; a plurality of turning tools are installed on the conversion assembly; when the lifting assembly swings upward, the conversion assembly directs one of the turning tools toward the valve casting.

2. A valve casting turning equipment according to claim 1, characterized in that: A primary locking assembly and a secondary locking assembly are installed on the processing table (3), wherein the primary locking assembly is used to limit the connection end face of the lower end of the valve casting, and the secondary locking assembly is used to limit the connection end face of the upper end of the valve casting.

3. A valve casting turning equipment according to claim 2, characterized in that: The primary locking assembly comprises a plurality of transmission bins (601) arranged in the processing table (3), a driving gear (602) movably connected in the corresponding transmission bins (601), a first motor (603) installed in the corresponding transmission bins (601), a support frame (604) slidably connected in the corresponding transmission bins (601), a linkage gear (605) meshingly connected to the driving gear (602) and a driven gear (606) meshingly connected to the linkage gear (605), wherein the driving gear (602) is engaged with the driven gear (606). 02) is fixedly mounted on the output end of the first motor (603), the first motor (603) is used to drive the driving gear (602) to rotate, the driving gear (602) is used to transmit power to the linkage gear (605), the support frame (604) is provided with a tooth groove and meshes with the driving gear (602), the driving gear (602) is used to drive the support frame (604) to slide close to or away from the connecting end face of the lower end of the valve casting, and the linkage gear (605) is used to transmit power to the driven gear (606).

4. A valve casting turning equipment according to claim 3, characterized in that: The secondary locking assembly comprises a rack (701) slidably connected to the processing table (3), a side support plate (702) fixedly connected to one end of the rack (701), and a side support table (703) fixedly connected to the side support plate (702). The rack (701) is meshed with a driven gear (606). The driven gear (606) is used to drive the rack (701) to slide and move the side support plate (702) and the connecting end face fixedly close to or away from the upper end of the valve casting.

5. The valve casting turning equipment according to claim 4, characterized in that: The shifting assembly comprises an ear frame (801) fixed on a frame (4), a screw rod (802) movably connected to the ear frame (801), a sub-gear (803) fixedly connected to the screw rod (802), a spur gear (804) movably connected to the frame (4), a No. 2 motor (805) installed on the frame (4) and a slide (806) threadedly connected to the screw rod (802), the spur gear (804) being fixedly connected to the output end of the No. 2 motor (805), the No. 2 motor (805) being used to drive the spur gear (804) to rotate, the spur gear (804) being meshed with the sub-gear (803), the spur gear (804) being used to drive the sub-gear (803) to rotate, the sub-gear (803) being used to drive the screw rod (802) to rotate, and the screw rod (802) being used to drive the slide (806) to slide axially along the guide rod (5).

6. A valve casting turning equipment according to claim 5, characterized in that: The adjustment assembly includes a No. 1 cylinder (901) installed on a slide (806) and an adjustment seat (902) installed on the output end of the No. 1 cylinder (901), and the No. 1 cylinder (901) is used to drive the adjustment seat (902) to move closer to or away from the center of the valve casting connection end face.

7. A valve casting turning equipment according to claim 6, characterized in that: The lifting assembly comprises a No. 3 motor (1001) mounted on a positioning seat (902), a shaft head (1002) movably connected in the positioning seat (902), a signal sending module (1003) mounted on the shaft head (1002) and a bevel gear (1004) fixedly connected to the shaft head (1002), one end of the shaft head (1002) is fixed on the output end of the No. 3 motor (1001), and the other end of the shaft head (1002) is connected to the bevel gear (1004), the No. 3 motor (1001) is used to drive the shaft head (1002) and the bevel gear (1004) to rotate, the bevel gear (1004) is used to transmit power to the conversion assembly, and the signal sending module (1003) is used to detect the rotation state of the shaft head (1002).

8. The valve casting turning equipment according to claim 7, characterized in that: The signal sending module (1003) includes a spring and a torque sensor installed in the shaft head (1002). The torque sensor is installed in the shaft head (1002). One end of the spring is connected to the sensing end of the torque sensor, and the other end is connected to the adjustment seat (902). The torque sensor is used to detect the torque value of the spring and send a signal to the control unit of the third motor (1001).

9. A valve casting turning equipment according to claim 8, characterized in that: The conversion assembly comprises a cutter disc (1101) arranged above a processing table (3), a column cavity (1102) fixedly connected to the cutter disc (1101), a bevel gear disc (1103) fixedly connected to the column cavity (1102), a No. 2 air cylinder (1104) installed in the column cavity (1102), and a movable head (1105) fixedly connected to the output end of the No. 2 air cylinder (1104). The cutter disc (1101) is used to install a plurality of turning tools, and the movable head (1105) is movable. Connected to the shaft head (1002), the No. 2 cylinder (1104) is used to drive the bevel gear (1103) to approach or move away from the bevel gear (1004). When the cutter disc (1101) swings upward, the bevel gear (1103) meshes with the bevel gear (1004); when the cutter disc (1101) swings downward, the bevel gear (1103) and the bevel gear (1004) are disengaged; when turning the valve casting, the bevel gear (1103) and the bevel gear (1004) are meshed.

10. A valve casting turning method, characterized in that: Using a valve casting turning device as claimed in claim 9, The following steps are involved: S1: Place the valve casting into the processing table (3) so that the upper connection end surface is exposed above the processing table (3) S2: Start the No. 2 motor (805) in the shifting assembly, and through the meshing transmission of the spur gear (804) and the pinion gear (803), the screw (802) rotates, and with the directional effect of the guide rod (5), the slide (806) moves from one side of the screw (802) to the middle of the screw (802), facing the center of the valve casting. At this time, the lifting assembly and the conversion assembly are in place; S3: The No. 1 motor (603) in the primary locking assembly is started, and the driving gear (602) is rotated to drive the support frame (604) to extend obliquely downward from the transmission chamber (601) and abut against the connecting end face of the lower end of the valve casting, thereby locking the valve casting in the processing table (3). At the same time, due to the meshing transmission effect between the linkage gear (605), the driven gear (606) and the rack (701), the side support plate (702) and the side support table (703) also move synchronously with the movement of the support frame (604) to approach the connecting end face of the upper end of the valve casting until the connecting end face of the upper end of the valve casting is locked. This friction locking method prevents the valve casting from shaking and rotating in the processing table (3); S4: according to the turning needs, start the third motor (1001) in the lifting assembly, control the rotation of the shaft head (1002) and the bevel gear (1004), drive the conversion assembly to swing upward, and use the meshing transmission effect of the bevel gear (1004) and the bevel gear disc (1103) to rotate the cutter disc (1101) synchronously, and adjust the direction of the turning tool on it until the appropriate turning tool faces downward. At this time, the torque sensor in the signal sending module (1003) detects the torque signal of the spring; S5: The torque sensor sends a signal to the control unit of the No. 3 motor (1001) and the No. 2 cylinder (1104). The No. 2 cylinder (1104) starts first to control the column cavity (1102) to move away from the movable head (1105). At the same time, the bevel gear (1004) and the bevel gear disk (1103) are disengaged. Then the No. 3 motor (1001) controls the shaft head (1002) to rotate and reset to the initial state. After the torque signal of the spring disappears, the No. 2 cylinder (1104) starts again to control the column cavity (1102) to move close to the movable head (1105), so that the bevel gear (1004) and the bevel gear disk (1103) are re-engaged. S6: Start the driving machine to control the rotation of the processing table (3) and the locked valve casting, and the turning tool acts on the valve casting to turn. At the same time, the No. 1 cylinder (901) in the adjustment component controls the turning tool to move on the valve casting according to the command, and processes from the edge of the valve casting to the center or from the center of the valve casting to the edge.

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