Head upsetting equipment for valve rod

Abstract

The invention discloses valve rod head upsetting equipment, which relates to the field of machining equipment and comprises an upsetting machine, an upsetting plate bottom and an upsetting head. A clamping plate is arranged below the upsetting plate, a supporting column is arranged at the bottom of the clamping plate, a clamping body is installed in the middle of the clamping plate, a plurality of conical holes are formed in the clamping body, conical sleeves are arranged at inlets of the conical holes, plugging holes are formed in the clamping body, and plugging components are arranged outside the clamping body layer by layer. The outer portion of the supporting column body is connected with a stress release component, the bottom of the clamping body is provided with a buffer plate, the bottom of the valve rod is connected to the buffer plate, and the outer ring of the buffer plate is connected with the stress release component. The conical hole formed in the clamping body is matched with the conical sleeve to achieve the clamping effect on the valve rod, and the plug-in component, the buffer plate and the stress release component which are arranged on different layers of the clamping body are used in a combined mode, so that layer-by-layer buffering is achieved, and the problem that the valve rod jumps out of the clamping position is solved.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical processing equipment, in particular to a valve stem head upsetting device. Background Art

[0002] The valve stem is the core control component in industrial valves. It is mainly used to connect the valve actuator and the opening and closing parts (such as the valve disc) to achieve the on-off, flow regulation or flow direction control of the fluid through transmission. The valve stem is processed through rod-shaped steel raw materials, and the stem part of the valve stem is processed through cutting, lathe and other mechanical processing methods. As for the head of the valve stem, it bears the stress of the parts in the torsion and tensile directions, plays a supporting and fixing role, thereby preventing breakage and deformation, and the head position of the valve stem is processed into a circular head structure in turn.

[0003] When the valve stem head is subjected to upsetting treatment, the stem of the valve stem is clamped by a clamping tool such as a clamp, and the head of the valve stem is subjected to upsetting treatment by a hydraulic upsetting device. Because the existing upsetting treatment of the valve stem head requires a single clamping of the valve stem, and then the hydraulic upsetting device is used to perform the upsetting treatment, since the valve stem itself is a slender rod-shaped structure, single clamping not only has low processing efficiency, but also the upsetting head acts on the valve stem during the upsetting treatment. When single clamping is used, if the head of the valve stem is in the center position of the upsetting device, the upsetting treatment is just achieved. When the head of the valve stem deviates from the center position of the upsetting device, , the head of the valve stem contacts the upsetting device to one side, resulting in uneven upsetting of the head. In the upsetting process, the stem is clamped by a clamping tool, and the clamping tool applies a lateral force to the stem of the valve stem. The upsetting device applies a vertical force to the head of the valve stem. The valve stem remains stationary in the clamping position, which makes it easy for the stem stress to be insufficiently released. The force of the clamping tool to clamp the valve stem is fixed, while the force of the upsetting device on the stem head continues to increase, which makes it easy for the clamping tool to fail to clamp the stem of the valve stem, causing the valve stem to jump out of the clamping tool. For this reason, we propose a valve stem head upsetting device. Summary of the invention

[0004] The object of the present invention is to provide a valve stem head upsetting device to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a valve stem head upsetting device, comprising an upsetting machine, a bottom plate is installed at the bottom of the upsetting machine, an upsetting plate is installed at the hydraulic output end of the upsetting machine, and a plurality of upsetting heads are installed at the bottom of the upsetting plate; a clamping plate is provided under the upsetting plate, and a support column connected to the bottom plate is provided around the bottom of the clamping plate, a clamping body is installed in the middle of the clamping plate, a plurality of conical holes corresponding to the upsetting heads are provided in the clamping body, and a conical sleeve which is sleeved on the outside of the valve stem is provided at the entrance of the conical holes, plugging holes are opened layer by layer on the outside of the clamping body, and plugging components which are plugged into the plugging holes are provided layer by layer on the outside of the clamping body; a stress release component is connected to the outside of the support column, a buffer plate is provided at the bottom of the clamping body, and the bottom of the valve stem is connected to the buffer plate, and the outer ring of the buffer plate is connected to a plurality of stress release components.

[0006] Preferably, a buffer pad is provided in the middle of the splint, the upper part of the buffer pad is a backing plate, and the lower part of the buffer pad is an annular frame, the outer ring part of the annular frame is fitted at the middle installation position of the splint, and the clamping body is installed on the inner ring part of the annular frame.

[0007] Preferably, the clamping body includes a fitting ring plate connected to the inner ring of the annular frame, a mounting body with a step is arranged inside the fitting ring plate, the upsetting plate is fitted at the step position, a conical hole is opened on the mounting body, and a release groove for releasing the valve stem head after upsetting is provided at the upper part of the conical hole, a buffer groove with a diameter that decreases layer by layer is provided on the outside of the mounting body, and a plugging hole is opened on the inner wall of the buffer groove.

[0008] Preferably, the plugging component includes a connecting ring body arranged at the buffer groove, a plurality of metal plugs are arranged on the connecting ring body, and an electric telescopic rod is installed on the metal plug, a plurality of positioning bent rods are installed on the clamp, and an electromagnetic block is installed on the positioning bent rod, after the electromagnetic block attracts the metal plug to the plugging hole, the head of the electric telescopic rod passes through the metal plug and is pressed on the outside of the conical sleeve.

[0009] Preferably, the stress release component includes a movable magnetic ring installed on the outside of the supporting column, a fixed ring is sleeved on the bottom of the supporting column, and a spring is connected between the movable magnetic ring and the fixed ring, the spring is sleeved on the outside of the supporting column, and a buffer rod is connected to the outside of the movable magnetic ring, and the buffer rod is installed on the outside of the buffer plate.

[0010] Preferably, the outside of the fixing ring is connected to a mounting block, and the mounting block is connected to a movable rod, one end of the movable rod is sleeved with a connecting ball, and the connecting ball is mounted on the buffer rod.

[0011] Preferably, the interior of the support column is a cavity, and a metal piston that is attracted to the movable magnetic ring is provided in the cavity, the bottom of the support column is connected to an air pipe, a box is installed on the bottom plate, and the box is connected to the air pipe, and a plurality of air ports corresponding to the conical holes are opened on the top of the box.

[0012] Preferably, the metal plugs in adjacent buffer grooves are staggered and distributed at equal angles.

[0013] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a clamping body at the position of clamping the valve stem, thereby clamping multiple valve stems at the same time, and realizing synchronous upsetting treatment of multiple valve stem heads. The conical hole provided on the clamping body cooperates with the conical sleeve to realize the clamping effect of the valve stem. The plug-in components provided at different layers on the clamping body and the buffer plate provided at the bottom position of the clamping, through the combined use of the buffer plate and the stress release component, after the plug-in components at different layers are inserted, buffering is realized layer by layer, and stress release of the valve stem rod portion is realized, thereby avoiding deformation of the valve stem rod portion when the valve stem head is upset.

[0014] The present invention provides a cavity structure inside the supporting column. When the valve stem head moves downward during upsetting, the metal piston in the cavity is driven to move through the stress release component. The metal piston guides the gas inside the cavity from the air pipe to the box body, thereby releasing the gas at the air port position corresponding to the tapered hole, thereby facilitating cooling of the valve stem at the tapered hole, so that the valve stem can be removed from the tapered hole position after the upsetting is completed.

[0015] The present invention realizes upsetting processing of valve stem heads with different shapes by arranging different upsetting heads. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a bottom view structural schematic diagram of the present invention; Figure 3 This is a schematic diagram of the structure of the present invention after the upsetting machine is removed; Figure 4 This is a schematic diagram of the valve stem inserted into the clamping body structure of the present invention; Figure 5 It is a schematic diagram of a partial cutaway structure of the clamping body of the present invention; Figure 6 It is a structural schematic diagram of the pad of the present invention; Figure 7 It is a structural schematic diagram of the clamping body of the present invention; Figure 8 This is a schematic diagram of the structure of the plug-in component of the present invention; Fig. 9 It is a structural schematic diagram of the stress release component of the present invention; Fig.10 for Fig. 9 Schematic diagram of the partial cross-section structure of the middle support column.

[0017] In the figure: 1-upsetting machine; 2-clamp; 3-support column; 4-clamping body; 5-insertion component; 6-stress release component; 7-buffer plate; 11-bottom plate; 12-upsetting plate; 13-upsetting head; 21-pad; 22-annular frame; 31-cavity; 32-metal piston; 33-air pipe; 34-box; 35-air port; 41-conical hole; 42-conical sleeve; 43-plugging hole; 44-fitting ring plate; 45-mounting body; 46-release groove; 47-buffer groove; 51-connecting ring body; 52-metal plug block; 53-electric telescopic rod; 54-positioning curved rod; 55-electromagnetic block; 61-movable magnetic ring; 62-fixing ring; 63-spring; 64-buffer rod; 65-mounting block; 66-movable rod; 67-connecting ball. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] See also Figure 1-10 The present invention provides a technical solution: a valve stem head upsetting device, which is used to solve the problem that the existing valve stem head upsetting needs a single upsetting, and during the upsetting process, the valve stem rod stress is not released in time, resulting in the deformation of the valve stem rod. The design includes an upsetting machine 1, the upsetting machine 1 adopts a hydraulic control method, a bottom plate 11 is installed at the bottom of the upsetting machine 1, and a mounting gasket fixed to the ground position is arranged on the bottom plate 11, and an upsetting plate 12 is installed at the hydraulic output end of the upsetting machine 1. Under the control of the hydraulic equipment, the upsetting plate 12 2 can move up and down, and a plurality of upsetting heads 13 are installed at the bottom of the upsetting plate 12. The upsetting heads 13 and the upsetting plate 12 are designed to be detachable. The upsetting heads 13 can be removed from the upsetting plate 12 by threaded connection or other fixed connection methods. The design of the upsetting heads 13 is selected according to the shape of the rough valve stem head that needs to be upset. The valve stem head has a round shape and a concave spherical shape. When the hydraulic equipment drives the upsetting plate 12 and the upsetting heads 13 to move toward the valve stem, the interior of the upsetting heads 13 is a concave spherical shape, so that the valve stem head is easily upset into a spherical shape; A clamping plate 2 is provided below the upsetting plate 12, and supporting columns 3 connected to the bottom plate 11 are provided around the bottom of the clamping plate 2. The clamping plate 2 is a rectangular plate of steel as a whole, and a circular mounting hole is provided in the center portion thereof. In order to facilitate clamping of multiple valve stems at the same time, a clamping body 4 is installed in the middle of the clamping plate 2, and a plurality of conical holes 41 corresponding to the upsetting head 13 are provided in the clamping body 4, and a conical sleeve 42 which is sleeved on the outside of the valve stem is provided at the entrance of the conical hole 41. A buffer pad is provided in the middle of the clamping plate 2, and the upper portion of the buffer pad is a pad 21, and the lower portion of the buffer pad is an annular frame 22. Both the pad 21 and the annular frame 22 are made of high temperature resistant material, and the outer ring portion of the annular frame 22 is fitted in the middle mounting position of the clamping plate 2, and the clamping body 4 is installed in the inner ring portion of the annular frame 22.

[0020] The tapered hole 41 is as shown in the attached Figure 5 As shown in , the diameter of the circular hole at the upper part of the tapered hole 41 is larger than the diameter of the valve stem, and the diameter of the lower part of the tapered hole 41 gradually decreases (because the valve stem needs to be heated when the valve stem head is upset. When the valve stem head is upset, the diameter of the upper opening of the tapered hole 41 is large, which is convenient for the valve stem to be quickly inserted). The valve stem is clamped. First, the outside of the valve stem is clamped by tools such as pliers, and then it is sleeved in the tapered sleeve 42. The tapered sleeve 42 is made of high temperature resistant material, and its outer surface is ductile. Then, the valve stem head is clamped by pliers, and the sleeved tapered sleeve 42 is inserted into the tapered hole 41. The clamping body 4 includes a fitting ring plate 44 connected to the inner ring of the annular frame 22. The fitting ring plate 44 and the annular frame 22 are welded together. When installing the buffer pad, first, the annular frame 22 together with the clamping body 4 is inserted into the mounting hole position in the middle of the clamp 2, and then the lower part of the annular frame 22 is engaged with the outer wall of the lower part of the mounting hole, and the upper pad 21 is fitted on the surface of the clamp 2, and then the pad 21 is fixed to the clamp 2 by using bolts, screws and other fixing structures. The pad 21 plays a role in heat insulation and shock absorption on the surface of the clamp 2, thereby reducing the pressure directly acting on the clamp 2 during the operation of the upsetting machine 1, thereby reducing the damage to the clamp 2.

[0021] A mounting body 45 with a step is arranged in the fitting ring plate 44, and the mounting body 45 as a whole is also in an inverted cone, that is, the upper area of ​​the mounting body 45 is large, and the lower area is small, and it gradually transitions from a large area to a small area. The upsetting plate 12 is fitted at the step position, and a conical hole 41 is opened on the mounting body 45, and a release groove 46 for releasing the valve stem head after upsetting is provided on the upper part of the conical hole 41. When the upsetting head 13 of the upsetting machine 1 acts on the position of the valve stem head, the valve stem head is deformed, and the deformed part can be released along the release groove 46. The outside of the mounting body 45 is provided with a buffer groove 47 with a diameter that decreases layer by layer, and the plugging hole 43 is opened on the inner wall of the buffer groove 47. The outside of the clamping body 4 is provided with plugging holes 43 layer by layer, and the outside of the clamping body 4 is provided with plugging parts 5 that are plugged into the plugging holes 43 layer by layer, and the metal plugs 52 in adjacent buffer grooves 47 are staggered at equal angles.

[0022] In order to maintain the stability of the bottom of the valve stem, a buffer plate 7 is provided at the bottom of the clamping body 4. By clamping the bottom of the valve stem on the buffer plate 7, the valve stem does not completely penetrate the buffer plate 7. In this way, when the valve stem is upset and moves downward, part of the valve stem acts on the buffer plate 7. In order to release the stress on the valve stem, a stress release component 6 is connected to the outside of the support column 3, and the bottom of the valve stem is connected to the buffer plate 7. The outer ring of the buffer plate 7 is connected to multiple stress release components 6.

[0023] After the valve stem is inserted into the tapered hole 41, the hydraulic equipment on the upsetting machine 1 is started, so that the upsetting plate 12 drives the multiple upsetting heads 13 to move toward the clamped valve stem head. Since the multiple valve stems are located at the upper position of the tapered hole 41 after being covered with the tapered sleeve 42, after the upsetting head 13 acts on the valve stem head, the valve stem moves downward until the tapered sleeve 42 is inserted into the tapered hole 41. During the downward movement of the valve stem, the valve stem acts on the buffer plate 7, thereby releasing the vertical force on the valve stem, effectively avoiding deformation of the valve stem.

[0024] After the valve stem together with the tapered sleeve 42 is pressed into the tapered hole 41, the valve stem is in a clamped state. When the upsetting head 13 acts downward again, in order to slow down the sliding speed of the tapered sleeve 42 and avoid excessive force on the tapered sleeve 42, the insertion component 5 includes a connecting ring body 51 arranged at the buffer groove 47, and a plurality of metal plugs 52 are arranged on the connecting ring body 51, and an electric telescopic rod 53 is installed on the metal plug 52. A plurality of positioning bent rods 54 are installed on the clamping plate 2, and an electromagnetic block 55 is installed on the positioning bent rod 54. After the electromagnetic block 55 absorbs the metal plug 52 to the plugging hole 43, the head of the electric telescopic rod 53 passes through the metal plug 52 and is pressed on the outside of the tapered sleeve 42.

[0025] In this way, when the upsetting head 13 continues to act, since the conical sleeve 42 itself has ductility, it can shrink and deform. When the conical sleeve 42 is pressed downward, the metal plug 52 is adsorbed by starting the control electromagnetic block 55. After the metal plug 52 slides to the plugging hole 43, the electric telescopic rod 53 acts on the surface of the conical sleeve 42, thereby increasing the fitting area between the conical sleeve 42 and the conical hole 41. At the same time, a layer-by-layer plugging method is adopted to avoid the situation in which the clamping force is fixed during direct clamping, while the downward force of the upsetting continues to increase, causing the valve stem to directly jump out of the clamping position.

[0026] The stress release component 6 includes a movable magnetic ring 61 installed on the outside of the support column 3, a fixed ring 62 is sleeved on the bottom of the support column 3, and a spring 63 is connected between the movable magnetic ring 61 and the fixed ring 62, and the spring 63 is sleeved on the outside of the support column 3. The outside of the movable magnetic ring 61 is connected to a buffer rod 64, and the buffer rod 64 is installed on the outside of the buffer plate 7. The outside of the fixed ring 62 is connected to a mounting block 65, and the mounting block 65 is connected to a movable rod 66, one end of the movable rod 66 is sleeved with a connecting ball 67, and the connecting ball 67 is installed on the buffer rod 64.

[0027] When the valve stem is upset and moves downward, since the bottom of the valve stem is engaged on the buffer plate 7, the outer side of the buffer plate 7 is fixedly connected to the buffer rod 64. In this way, the buffer rod 64 and the movable magnetic ring 61 are driven to move during the downward movement of the buffer plate 7. The movable magnetic ring 61 acts on the spring 63, thereby releasing part of the force.

[0028] In order to cool the valve stem after upsetting, a cavity 31 is formed inside the support column 3, and a metal piston 32 is arranged in the cavity 31 and is attracted to the movable magnetic ring 61. An air pipe 33 is connected to the bottom of the support column 3, and a box 34 is installed on the bottom plate 11, and the box 34 is connected to the air pipe 33. A plurality of air ports 35 corresponding to the tapered hole 41 are formed on the top of the box 34. When the movable magnetic ring 61 moves, the metal piston 32 moves synchronously, thereby squeezing the air in the cavity 31 into the box 34, and then acting along the air port 35 to the position of the tapered hole 41, so as to facilitate cooling of the valve stem and facilitate removal of the valve stem after upsetting.

[0029] When used specifically: first, clamp the outside of the valve stem with tools, such as pliers, and then put it in the conical sleeve 42. The conical sleeve 42 is made of high-temperature resistant material and its outer surface is ductile. Then, clamp the head of the valve stem with pliers, insert the conical sleeve 42 into the conical hole 41, and clamp the bottom of the valve stem on the buffer plate 7. When the upsetting head 13 continues to act, the conical sleeve 42 itself is ductile, that is, it can shrink and deform. When the conical sleeve 42 is pressed downward, the electromagnetic block 55 is energized to generate magnetism. The principle of the electromagnet generating magnetism is based on electromagnetic induction and the magnetic effect of electric current. When electric current passes through a wire, a magnetic field is generated around it. This phenomenon is called the magnetic effect of electric current. Specifically, the working principle of the electromagnet is to wind conductive windings that match its power around the outside of the iron core. When power is applied, these windings will generate a magnetic field, thereby magnetizing the iron core to form an electromagnet. The electromagnet block 55 in this solution uses a common and universal electromagnet, and a rectangular electromagnet of model 192x34x23 is selected. Its power-on voltage is 24V or 12V. When it is powered on, it generates a strong magnetic force. The principle of switch control of the electromagnet is the same as that of existing products. It is connected in series through wires, or each electromagnet is individually controlled and started by a battery. The current passed through the electromagnet is a prior art, so it will not be described in detail here. It can adsorb metal materials, and the electromagnet block 55 is controlled to adsorb the metal plug block 52 by starting. Because the electromagnet block 55 and the metal plug block 52 are staggered at a certain distance, as shown in the attached figure Figure 8 As shown in the figure, three metal plugs 52 are alternately distributed on the connecting ring body 51 of each layer, and the metal plug 52 on the top layer is closest to the electromagnetic block 55. After the electromagnetic block 55 is energized, the magnetic attraction force attracts the metal plug 52 to slide along the buffer groove 47 until the metal plug 52 slides to the plugging hole 43. At this time, the switch of the electric telescopic rod 53 is turned on. The electric telescopic rod 53 uses an existing micro DC coaxial electric push rod. A starting switch is installed on the electric push rod. The specific power supply controls the telescopic movement of the electric push rod with reference to the working principle of the existing micro DC coaxial electric push rod. The electric telescopic rod 53 is pushed along the corresponding plugging hole 43 until the electric telescopic rod 53 acts on the surface position of the tapered sleeve 42, thereby increasing the fitting area between the tapered sleeve 42 and the tapered hole 41. At the same time, a layer-by-layer plugging method is adopted to avoid the situation where the clamping force is fixed during direct clamping, while the downward force of the upsetting continues to increase, causing the valve stem to directly jump out of the clamping position. When the valve stem is upset and moves downward, since the bottom of the valve stem is engaged on the buffer plate 7, the outer side of the buffer plate 7 is fixedly connected to the buffer rod 64, so that the buffer rod 64 and the movable magnetic ring 61 are driven to move during the downward movement of the buffer plate 7, and the movable magnetic ring 61 acts on the spring 63, thereby releasing part of the force. When the movable magnetic ring 61 moves, the metal piston 32 moves synchronously, thereby squeezing the air in the cavity 31 into the box body 34, and then acting along the air port 35 to the position of the tapered hole 41, so as to facilitate cooling of the valve stem, thereby making it convenient to remove the valve stem after the upsetting is completed.

[0030] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0031] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A valve stem head upsetting device, comprising an upsetting machine (1), wherein a bottom plate (11) is installed at the bottom of the upsetting machine (1), characterized in that: A hydraulic output end of the upsetting machine (1) is provided with an upsetting plate (12), and a plurality of upsetting heads (13) are provided at the bottom of the upsetting plate (12); A clamping plate (2) is provided below the upsetting plate (12), and support columns (3) connected to the bottom plate (11) are provided around the bottom of the clamping plate (2); a clamping body (4) is installed in the middle of the clamping plate (2); a plurality of tapered holes (41) corresponding to the upsetting head (13) are provided in the clamping body (4); a tapered sleeve (42) sleeved on the outside of the valve stem is provided at the entrance of the tapered hole (41); plugging holes (43) are provided on the outside of the clamping body (4) layer by layer, and plugging components (5) plugged into the plugging holes (43) are provided on the outside of the clamping body (4) layer by layer; The outside of the support column (3) is connected to a stress release component (6), the bottom of the clamping body (4) is provided with a buffer plate (7), the bottom of the valve stem is connected to the buffer plate (7), and the outer ring of the buffer plate (7) is connected to a plurality of stress release components (6).

2. A valve stem head upsetting device according to claim 1, characterized in that: A buffer pad is provided in the middle of the clamping plate (2), the upper part of the buffer pad is a backing plate (21), and the lower part of the buffer pad is an annular frame (22), the outer ring part of the annular frame (22) is fitted at the middle installation position of the clamping plate (2), and the clamping body (4) is installed on the inner ring part of the annular frame (22).

3. A valve stem head upsetting device according to claim 2, characterized in that: The clamping body (4) comprises a fitting ring plate (44) connected to the inner ring of the annular frame (22), a mounting body (45) with a step is arranged inside the fitting ring plate (44), the upsetting plate (12) is fitted at the step position, a conical hole (41) is provided on the mounting body (45), and a release groove (46) is provided on the upper part of the conical hole (41) for releasing the valve stem head after upsetting, a buffer groove (47) with a diameter decreasing layer by layer is provided on the outside of the mounting body (45), and the plugging hole (43) is provided on the inner wall of the buffer groove (47).

4. A valve stem head upsetting device according to claim 3, characterized in that: The plugging component (5) comprises a connecting ring body (51) arranged at the buffer groove (47), a plurality of metal plugs (52) are arranged on the connecting ring body (51), and an electric telescopic rod (53) is installed on the metal plugs (52), a plurality of positioning curved rods (54) are installed on the clamping plate (2), and an electromagnetic block (55) is installed on the positioning curved rod (54), and after the electromagnetic block (55) absorbs the metal plug (52) to the plugging hole (43), the head of the electric telescopic rod (53) passes through the metal plug (52) and is pressed against the outside of the conical sleeve (42).

5. The valve stem head upsetting device according to claim 1, characterized in that: The stress release component (6) comprises a movable magnetic ring (61) mounted on the outside of the support column (3); a fixed ring (62) is sleeved on the bottom of the support column (3); a spring (63) is connected between the movable magnetic ring (61) and the fixed ring (62); the spring (63) is sleeved on the outside of the support column (3); a buffer rod (64) is connected to the outside of the movable magnetic ring (61); and the buffer rod (64) is mounted on the outside of the buffer plate (7).

6. The valve stem head upsetting device according to claim 5, characterized in that: The outside of the fixing ring (62) is connected to a mounting block (65), and the mounting block (65) is connected to a movable rod (66). One end of the movable rod (66) is sleeved with a connecting ball (67), and the connecting ball (67) is mounted on the buffer rod (64).

7. The valve stem head upsetting device according to claim 5, characterized in that: The support column (3) has a cavity (31) inside, and a metal piston (32) is disposed in the cavity (31) and is attracted to the movable magnetic ring (61). The bottom of the support column (3) is connected to an air pipe (33). A box (34) is mounted on the bottom plate (11), and the box (34) is connected to the air pipe (33). The top of the box (34) is provided with a plurality of air ports (35) corresponding to the tapered holes (41).

8. The valve stem head upsetting device according to claim 4, characterized in that: The metal plugs (52) in adjacent buffer grooves (47) are staggered and distributed at equal angles.

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