A valve stem head upsetting device

Abstract

The present invention discloses a valve stem head upsetting device, which relates to the field of machining equipment and includes an upsetting machine, an upsetting plate bottom and an upsetting head; there is a clamping plate below the upsetting plate, and support columns are provided at the bottom of the clamping plate. A clamping body is installed in the middle of the clamping plate. A plurality of tapered holes are provided in the clamping body, and a tapered sleeve is provided at the entrance of the tapered hole. A plugging hole is provided on the clamping body, and plugging components are provided layer by layer outside 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. The outer ring of the buffer plate is connected to the stress release component. In this upsetting device, a clamping body is arranged at the valve stem clamping position to realize synchronous upsetting treatment of the heads of multiple valve stems. The tapered holes provided on the clamping body cooperate with the tapered sleeve to achieve the clamping effect on the valve stem. The plugging components arranged at different layers on the clamping body, the combined use of the buffer plate and the stress release component, thus realizing layer-by-layer buffering and avoiding the problem that the valve stem pops out of the clamping position.

Description

Technical Field

[0001] The present invention relates to the technical field of machining equipment, and particularly to a valve stem head upsetting device. Background Art

[0002] The valve stem is a core control component in industrial valves, mainly used to connect the valve actuator and the opening and closing member (such as the valve disc), and to achieve the on-off, flow regulation or flow direction control of the fluid through transmission. When the valve stem is processed, it is processed from a rod-shaped steel raw material, and the rod part of the valve stem is processed through mechanical processing means such as cutting and lathe. For the head of the valve stem, since it bears the stress of the part in the torsion and tension directions and plays a role in support and fixation, thus preventing fracture and deformation, a head structure such as a circle is processed at the head position of the valve stem in sequence.

[0003] When upsetting the head of the valve stem, the rod part of the valve stem is clamped by clamping tools such as a fixture, and the head of the valve stem is upset by a hydraulic upsetting device. Because when the existing method is used to upset the head of the valve stem, the valve stem needs to be clamped individually and then upset by a hydraulic upsetting device. Since the valve stem itself is a slender rod-shaped structure, single clamping not only has low processing efficiency. During the upsetting process, the upset head acts on the valve stem. When clamping individually, if the head of the valve stem is at the center position of the upsetting device, the upsetting process can be 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 and biases to one side, resulting in uneven upsetting of the head. Moreover, during the upsetting process of the valve stem, since its rod part is clamped by the clamping tool, the clamping tool applies a lateral force to the rod part of the valve stem, and the upsetting device applies a vertical force to the head of the valve stem. At the clamping position, the valve stem remains stationary, and it is easy that the stress release of the rod part of the valve stem is insufficient. The clamping force of the clamping tool for clamping the valve stem is fixed, while the acting force of the upsetting device on the head of the valve stem continuously increases, which easily causes the clamping tool to be unable to clamp the rod part of the valve stem, making the valve stem jump out of the clamping tool. Therefore, we propose a valve stem head upsetting device. Summary of the Invention

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

[0005] To achieve the above object, the present invention provides the following technical solution: A valve stem head upsetting device, including an upsetting machine, a bottom plate is installed at the bottom of the upsetting machine, a 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 arranged below the upsetting plate, and support columns connected to the bottom plate are arranged around the bottom of the clamping plate. A clamping body is installed in the middle of the clamping plate. A plurality of tapered holes corresponding to the upsetting heads are opened in the clamping body, and a tapered sleeve sleeved outside the valve stem is arranged at the entrance of the tapered hole. Plugging holes are gradually opened outside the clamping body, and plugging components inserted into the plugging holes are arranged layer by layer outside the clamping body; a stress release component is connected to the outside of the support column, a buffer plate is arranged at the bottom of the clamping body, and the bottom of the valve stem is connected to the buffer plate. The outer ring of the buffer plate is connected to a plurality of stress release components.

[0006] Preferably, a buffer pad is arranged in the middle of the clamping plate. The upper part of the buffer pad is a backing plate, and the lower part of the buffer pad is an annular frame. Part of the outer ring of the annular frame is attached to the middle installation position of the clamping plate, and the clamping body is installed in 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. An installation body with steps is arranged inside the fitting ring plate. The upsetting plate is attached to the step position. The tapered hole is opened on the installation body, and a release groove for releasing after upsetting the valve stem head is arranged at the upper part of the tapered hole. Buffer grooves with gradually decreasing diameters are arranged outside the installation body, and the plugging holes are opened on the inner walls of the buffer grooves.

[0008] Preferably, the plugging component includes a connecting ring body arranged at the buffer groove. A plurality of metal plug blocks are arranged on the connecting ring body, and electric telescopic rods are installed on the metal plug blocks. A plurality of positioning curved rods are installed on the clamping plate, and electromagnetic blocks are installed on the positioning curved rods. After the electromagnetic blocks adsorb the metal plug blocks into the plugging holes, the heads of the electric telescopic rods pass through the metal plug blocks and press on the outside of the tapered sleeve.

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

[0010] Preferably, an installation block is connected to the outside of the fixed ring, and a movable rod is connected to the installation block. One end of the movable rod is sleeved with a connecting sphere, and the connecting sphere is installed on the buffer rod.

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

[0012] Preferably, the metal plug blocks in adjacent buffer grooves are distributed in an equiangular staggered manner.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0014] By arranging a clamping body at the position of clamping the valve stem, the present invention can clamp a plurality of valve stems simultaneously, realize the synchronous upsetting treatment of the heads of a plurality of valve stems. The conical holes arranged on the clamping body cooperate with the conical sleeves to achieve the clamping effect on the valve stems. The plugging components arranged at different layers on the clamping body, and the buffer plate arranged at the bottom position of the clamping body. Through the combined use of the buffer plate and the stress release components, after the plugging components at different layers are plugged in, layer-by-layer buffering is realized, and the stress release of the rod part of the valve stem is achieved, avoiding the deformation of the rod part of the valve stem when the head of the valve stem is upset.

[0015] By arranging a cavity structure inside the support column body, when the head of the valve stem is upset and moves downward, the stress release component drives the metal piston in the cavity to move. The metal piston guides the gas inside the cavity from the air pipe to the box body, and thus is released at the air port corresponding to the conical hole, facilitating the cooling treatment of the valve stem at the conical hole, and thus facilitating the removal of the valve stem from the conical hole position after the upsetting is completed.

[0016] By arranging different upsetting heads, the present invention can realize the upsetting treatment of different shapes of the heads of the valve stems. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0018] Figure 2 is a schematic diagram of the bottom view structure of the present invention;

[0019] Figure 3 is a schematic diagram of the structure of the present invention after removing the upsetting machine;

[0020] Figure 4 is a schematic diagram of the structure of the valve stem inserted into the clamping body of the present invention;

[0021] Figure 5 is a schematic diagram of the partial cross-sectional structure of the clamping body of the present invention;

[0022] Figure 6 is a schematic diagram of the structure at the backing plate of the present invention;

[0023] Figure 7Schematic diagram of the structure at the clamping body of the present invention;

[0024] Figure 8 Schematic diagram of the structure at the insertion component of the present invention;

[0025] Figure 9 Schematic diagram of the structure at the stress release component of the present invention;

[0026] Figure 10 is Figure 9 Schematic diagram of the partial sectional structure of the middle support column.

[0027] In the figure: 1-upsetting machine; 2-clamping plate; 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-backing plate; 22-annular frame; 31-cavity; 32-metal piston; 33-air pipe; 34-box body; 35-air port; 41-tapered hole; 42-tapered sleeve; 43-plug 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-electromagnet; 61-movable magnetic ring; 62-fixed ring; 63-spring; 64-buffer rod; 65-mounting block; 66-movable rod; 67-connecting sphere. Specific embodiments

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0029] Please refer to Figures 1 - 10, the present invention provides a technical solution: a valve stem head upsetting device, which is used to solve the problem that when upsetting the valve stem head, single upsetting is required, and during the upsetting process, the stress release of the valve stem is not timely, resulting in deformation of the valve stem. The design includes an upsetting machine 1, which is controlled hydraulically. A bottom plate 11 is installed at the bottom of the upsetting machine 1, and mounting gaskets fixed to the ground are provided on the bottom plate 11. A 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 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, connected by threads or other fixed connection methods, so that the upsetting heads 13 can be detached from the upsetting plate 12. The design of the upsetting heads 13 is selected according to the specific shape of the valve stem head to be upset. When the valve stem head is circular, a concave spherical shape is selected. When the hydraulic equipment drives the upsetting plate 12 and the upsetting heads 13 to move towards the valve stem, the inside of the upsetting heads 13 is a concave spherical shape, which is convenient for upsetting the valve stem head into a spherical shape;

[0030] 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. The clamping plate 2 is a rectangular steel plate, and a circular mounting hole is opened in the center part. In order to clamp multiple valve stems at the same time, a clamping body 4 is installed in the middle of the clamping plate 2. A plurality of tapered holes 41 corresponding to the upsetting heads 13 are opened in the clamping body 4, and a tapered sleeve 42 sleeved outside the valve stem is provided at the entrance of the tapered holes 41. 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. Both the backing plate 21 and the annular frame 22 are made of high-temperature resistant materials. The outer ring part of the annular frame 22 fits on the middle mounting position of the clamping plate 2, and the clamping body 4 is installed on the inner ring part of the annular frame 22.

[0031] As shown in the attached Figure 5 In the figure, the diameter of the round hole in 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 when upsetting the valve stem head, the valve stem needs to be heated. When upsetting the valve stem head, the upper opening diameter of the tapered hole 41 is large, which is convenient for quickly inserting the valve stem). To clamp the valve stem, first use tools such as pliers to clamp the outside of the valve stem, then put it into the tapered sleeve 42. The tapered sleeve 42 is made of high-temperature resistant material and has ductility on its outer surface. Then use pliers to clamp the position of the valve stem head and insert the sleeved tapered sleeve 42 into the tapered hole 41.

[0032] The clamping body 4 includes a fitting ring plate 44 connected to the inner circle of the annular frame body 22. The fitting ring plate 44 and the annular frame body 22 are welded together. When installing the buffer pad, first, the annular frame body 22 together with the clamping body 4 is inserted into the installation hole position in the middle of the clamping plate 2. Then, the lower part of the annular frame body 22 is clamped on the outer wall of the lower part of the installation hole, and the upper cushion plate 21 is attached to the surface of the clamping plate 2. Then, through fixing structures such as bolts and screws, the cushion plate 21 is fixed on the clamping plate 2. The function of the cushion plate 21 is to insulate and damp the surface of the clamping plate 2, reducing the direct action of the pressure during the operation of the upsetting machine 1 on the clamping plate 2, thereby reducing the damage to the clamping plate 2.

[0033] An installation body 45 with steps is arranged inside the fitting ring plate 44. The installation body 45 is also in an inverted cone shape as a whole, that is, the upper area of the installation body 45 is large and the lower area is small, gradually transitioning from a large area to a small area. The upsetting plate 12 is attached to the step position. A tapered hole 41 is opened on the installation body 45, and a release groove 46 for releasing the valve stem head after upsetting is provided at the upper part of the tapered hole 41. When the upsetting head 13 part of the upsetting machine 1 acts on the valve stem head position, the valve stem head deforms, and the deformed part can be released along the release groove 46. A buffer groove 47 with a gradually decreasing diameter is arranged outside the installation body 45, and a plugging hole 43 is opened on the inner wall of the buffer groove 47. Plugging holes 43 are gradually opened on the outside of the clamping body 4, and plugging components 5 are arranged on the outside of the clamping body 4 layer by layer to be inserted into the plugging holes 43. The metal plug blocks 52 in adjacent buffer grooves 47 are distributed at equal angles and staggered.

[0034] 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 moves downward under upsetting, part of the valve stem acts on the buffer plate 7. To release the stress on the valve stem, a stress release component 6 is connected to the outside of the support column body 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 a plurality of stress release components 6.

[0035] After the valve stem is inserted into the tapered hole 41, start the hydraulic equipment on the upsetting machine 1, so that the upsetting plate 12 drives a plurality of upsetting heads 13 to move towards the clamped valve stem head. Since a plurality of valve stems are in the upper position of the tapered hole 41 after being sleeved 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 acting force on the valve stem and effectively avoiding the deformation of the valve stem rod part.

[0036] After the valve stem and the tapered sleeve 42 are pressed into the tapered hole 41, the valve stem is in a clamped state. When the upset 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 plugging component 5 includes a connecting ring body 51 arranged at the buffer groove 47. A plurality of metal plug blocks 52 are arranged on the connecting ring body 51, and electric telescopic rods 53 are installed on the metal plug blocks 52. A plurality of positioning curved rods 54 are installed on the clamping plate 2, and electromagnetic blocks 55 are installed on the positioning curved rods 54. After the electromagnetic blocks 55 adsorb the metal plug blocks 52 to the plugging holes 43, the heads of the electric telescopic rods 53 pass through the metal plug blocks 52 and press on the outside of the tapered sleeve 42.

[0037] In this way, when the upset head 13 continuously acts, since the tapered sleeve 42 itself has ductility, it can shrink and deform. When the tapered sleeve 42 is pressed downward, by starting to control the electromagnetic blocks 55 to adsorb the metal plug blocks 52, after the metal plug blocks 52 slide to the position of the plugging holes 43, the electric telescopic rods 53 act on the surface of the tapered sleeve 42, thereby increasing the fitting area between the tapered sleeve 42 and the tapered hole 41. At the same time, the method of plugging layer by layer is adopted, thus avoiding the situation that when directly clamping, the clamping force is fixed, while the downward upsetting force continuously increases, resulting in the valve stem directly popping out of the clamping position.

[0038] For the stress release component 6, it includes a movable magnetic ring 61 installed outside the support column 3. A fixed ring 62 is sleeved at the bottom of the support column 3, and a spring 63 is connected between the movable magnetic ring 61 and the fixed ring 62. The spring 63 is sleeved outside 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 installed outside the buffer plate 7. A mounting block 65 is connected to the outside of the fixed ring 62, and a movable rod 66 is connected to the mounting block 65. One end of the movable rod 66 is sleeved with a connecting sphere 67, and the connecting sphere 67 is installed on the buffer rod 64.

[0039] When the valve stem moves downward due to upsetting, since the bottom of the valve stem is engaged with the buffer plate 7, the outside of the buffer plate 7 is fixedly connected to the buffer rod 64. In this way, during the downward movement of the buffer plate 7, the buffer rod 64 and the movable magnetic ring 61 are driven to move. The movable magnetic ring 61 acts on the spring 63, thereby releasing part of the acting force.

[0040] 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.

[0041] 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 8As shown, three metal plug blocks 52 are staggered and distributed on the connecting ring body 51 of each layer. The metal plug block 52 on the uppermost layer is closest to the electromagnetic block 55. After the electromagnetic block 55 is electrified, the magnetic suction adsorbs the metal plug block 52 to slide along the buffer groove 47 until the metal plug block 52 slides to the position of the plugging hole 43. At this time, by turning on the switch of the electric telescopic rod 53, the electric telescopic rod 53 selects an existing micro DC coaxial electric push rod. A start switch is installed on the electric push rod. For the specific power supply to control the telescopic movement of the electric push rod, refer to the working principle of the existing micro DC coaxial electric push rod. The electric telescopic rod 53 is pushed into the corresponding plugging hole 43 until the electric telescopic rod 53 acts on the surface of the tapered sleeve 42, thereby increasing the fitting area between the tapered sleeve 42 and the tapered hole 41. At the same time, the method of plugging layer by layer is adopted, thus avoiding the situation that when directly clamping, the clamping force is fixed, while the force acting downward during upsetting continuously increases, resulting in the valve stem directly popping out of the clamping position. When the valve stem moves downward during upsetting, since the bottom of the valve stem is clamped on the buffer plate 7, the outside of the buffer plate 7 is fixedly connected to the buffer rod 64. Thus, during the downward movement of the buffer plate 7, the buffer rod 64 and the movable magnetic ring 61 are driven to move. The movable magnetic ring 61 acts on the spring 63, thereby releasing part of the force. When the movable magnetic ring 61 moves, at this time the metal piston 32 moves synchronously, thus squeezing the air in the cavity 31 into the box body 34, and then acting on the tapered hole 41 along the air port 35, which is convenient for cooling the valve stem, and thus facilitating the removal of the valve stem after upsetting is completed.

[0042] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device.

[0043] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. 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), and the characteristics are as follows: A upsetting plate (12) is installed at the hydraulic output end of the upsetting machine (1), and a plurality of upsetting heads (13) are installed at the bottom of the upsetting plate (12). A clamping plate (2) is arranged below the upsetting plate (12), and support columns (3) connected to the bottom plate (11) are arranged 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 heads (13) are formed in the clamping body (4). A tapered sleeve (42) sleeved outside the valve stem is arranged at the entrance of the tapered hole (41). Plug holes (43) are formed layer by layer outside the clamping body (4), and plugging components (5) plugged into the plug holes (43) are arranged layer by layer outside the clamping body (4). A stress release component (6) is connected to the outside of the support column (3). A buffer plate (7) is arranged at the bottom of the clamping body (4), 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 a plurality of stress release components (6).

2. The upsetting device for the valve rod head according to claim 1, characterized in that: A buffer pad is arranged 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 attached to the middle installation position of the clamping plate (2), and the clamping body (4) is installed in the inner ring part of the annular frame (22).

3. The upsetting device for the valve rod head according to claim 2, characterized in that: The clamping body (4) includes a fitting ring plate (44) connected to the inner ring of the annular frame (22). An installation body (45) with a step is arranged inside the fitting ring plate (44). The upsetting plate (12) is attached to the step position. The tapered hole (41) is formed in the installation body (45). A release groove (46) for releasing the valve stem head after upsetting is arranged at the upper part of the tapered hole (41). Buffer grooves (47) with gradually decreasing diameters are arranged outside the installation body (45), and the plug holes (43) are formed in the inner walls of the buffer grooves (47).

4. A valve stem head upsetting device according to claim 3, characterized in that: The plugging component (5) includes a connecting ring body (51) arranged at the buffer groove (47). A plurality of metal plug blocks (52) are arranged on the connecting ring body (51). An electric telescopic rod (53) is installed on the metal plug block (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). After the electromagnetic block (55) adsorbs the metal plug block (52) to the plug hole (43), the head of the electric telescopic rod (53) passes through the metal plug block (52) and presses on the outside of the tapered sleeve (42).

5. The upsetting device for the valve stem head according to claim 1, characterized in that: 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 at 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 installed on the outside of the buffer plate (7).

6. The upsetting device for the valve stem head according to claim 5, characterized in that: An installation block (65) is externally connected to the fixed ring (62), and a movable rod (66) is connected to the installation block (65). One end of the movable rod (66) is sleeved with a connecting sphere (67), and the connecting sphere (67) is installed on the buffer rod (64).

7. A valve stem head upsetting device according to claim 5, characterized in that: The interior of the support column body (3) is a cavity (31), and a metal piston (32) that adsorbs with the movable magnetic ring (61) is arranged in the cavity (31). A trachea (33) is connected to the bottom of the support column body (3). A box body (34) is installed on the bottom plate (11), and the box body (34) communicates with the trachea (33). A plurality of air ports (35) corresponding to the conical holes (41) are formed in the top of the box body (34).

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

Images