Non-rising stem wedge type forged steel gate valve

Abstract

The invention discloses a non-rising stem wedge type forged steel gate valve, and belongs to the technical field of forged steel gate valves. The non-rising stem wedge type forged steel gate valve comprises a valve body, a pair of heating pipes is arranged outside each of the two sides of the valve body, driving pipes are welded to the outer walls of the heating pipes, heat dissipation openings are formed in the outer walls of the heating pipes, electric heating pipes are slidably installed in the heating pipes, moving openings are formed in the outer walls of the heating pipes, and the moving openings are located in the opposite faces of the heat dissipation openings. And a lifting groove is formed in the driving pipe, a screw rod is installed in the lifting groove through a bearing, a lifting block is installed on the screw rod through a thread, and one end of the lifting block penetrates through the moving opening and is fixedly connected with the electric heating pipe in a threaded mode. The problems that in the using process of the prior art, when a low-temperature medium flows into the valve body, if the temperature difference between the inside and the outside is large, condensed water drops appear on the outer wall of the valve body, under the continuous action of the low temperature of the medium, the water drops are condensed into ice, an ice shell is formed outside the valve body, and normal use of the gate valve is affected are effectively solved.

Description

Technical Field

[0001] The invention relates to the technical field of forged steel gate valves, in particular to a concealed-stem wedge-type forged steel gate valve. Background Art

[0002] A forged steel gate valve refers to a valve whose closing part moves in the vertical direction along the center line of the passage. The forged steel gate valve mainly plays the role of connecting and cutting off the medium in the pipeline system, thereby realizing the on-off control of the fluid. The forged steel gate valve can be used in low-temperature media.

[0003] After searching, the prior art (publication number: CN104315218A) valve body and flange integral connection type forged steel gate valve, the article proposes "including valve body, gate, flange, valve cover, valve stem, valve stem nut, handwheel and flange hole, the valve body and flange are forged and processed as one piece, the flange is provided with a plurality of flange holes, the gate is installed in the valve body, the valve cover is fixedly connected to the valve body by bolts, a winding gasket is used between the valve body and the valve cover, a valve stem is installed in the middle of the valve cover, the valve stem The lower end is connected with the gate plate, the upper part of the valve stem is equipped with a valve stem nut, and the upper end of the valve stem nut is connected with the hand wheel. ", This invention improves the reliability of use, shortens the manufacturing cycle, and reduces material waste through the integral forging and processing of the valve body and flange; greatly improves the qualified rate of valves; overcomes the shortcomings of socket connection and threaded connection, can avoid the defects of valve weld leakage and the inconvenience of valve installation and disassembly, ensures that the valve body has no weld, no leakage and is easy to disassemble and install; the nominal pressure PN is 100 kgf / cm2; the applicable temperature is -29℃~425℃; the applicable medium: water, oil, steam; sealing: zero leakage, diameter DN15-50, made of carbon steel, heat-resistant steel and stainless steel, etc.; can be widely used in pipeline devices in the petroleum, chemical, fertilizer, power generation and other industries.

[0004] However, during the use of the prior art, when low-temperature medium flows into the interior of the valve body, if the temperature difference between the inside and the outside is large, condensed water droplets will appear on the outer wall of the valve body. Under the continuous action of the low temperature of the medium, the water droplets will condense into ice, forming an ice shell on the outside of the valve body, affecting the normal use of the gate valve. Therefore, it is necessary to design a concealed-stem wedge-type forged steel gate valve. Summary of the invention

[0005] The purpose of the present invention is to solve the problem that in the existing design, when a low-temperature medium flows into the interior of the valve body, if the temperature difference between the inside and the outside is large, condensed water droplets will appear on the outer wall of the valve body. Under the continuous action of the low temperature of the medium, the water droplets will condense into ice, forming an ice shell on the outside of the valve body, affecting the normal use of the gate valve.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: A concealed-stem wedge-type forged steel gate valve comprises a valve body, a pair of heating tubes are arranged on the outside of both sides of the valve body, and a driving tube is welded to the outer wall of the heating tube, a heat dissipation port is provided on the outer wall of the heating tube, an electric heating tube is slidably installed inside the heating tube, a moving port is provided on the outer wall of the heating tube, and the moving port is located on the opposite side of the heat dissipation port, a lifting groove is provided inside the driving tube, and a screw is installed inside the lifting groove through a bearing, a lifting block is installed on the screw through a thread, and one end of the lifting block passes through the moving port and is screwed and fixed to the electric heating tube, one end of the bottom of the screw passes through the driving tube and is welded with a pulley, a first transmission belt is sleeved between the two pulleys on the same side, a support plate is welded to the outer wall of one side of the heating tube, and a motor is screwed on the support plate, and two A cleaning roller is provided between the support plates, the output end of the motor is fixedly connected to one end of the cleaning roller through a coupling, the other end of the cleaning roller is connected to a support plate through a bearing, a first bevel gear is welded to the output end of the motor, a support plate is provided below the bottom of the motor, and one end of the support plate is welded and fixed to the support plate, a second bevel gear is meshed at the bottom of the first bevel gear, and a vertical rod is welded at the center of the bottom of the second bevel gear, one end of the bottom of the vertical rod passes through the support plate and is welded to the first transmission gear, a second transmission gear is provided on the outside of the first transmission gear, a connecting rod is welded at the center of the bottom of the second transmission gear, and a reciprocating assembly is provided at one end of the bottom of the connecting rod, and a second transmission belt is sleeved between the first transmission gear and the second transmission gear.

[0007] Preferably, the reciprocating assembly is located below the bottom of the valve body, and the reciprocating assembly includes a first spur gear, a second spur gear, a third spur gear, a fourth spur gear, a shell and a limit plate. The first spur gear is welded to one end of the bottom of the connecting rod, and the second spur gear is welded below the bottom of the first spur gear, the third spur gear is meshed on one side of the second spur gear, and the fourth spur gear is welded below the bottom of the third spur gear, the second spur gear and the third spur gear are externally sleeved with a shell, and the first spur gear and the fourth spur gear are both welded with limit plates, and the gear teeth of the first spur gear and the fourth spur gear are both meshed with the tooth grooves of the first transmission belt.

[0008] Preferably, the first spur gear and the fourth spur gear have the same size.

[0009] Preferably, a micro fan is screwed onto the bottom of one side of the heating tube.

[0010] Preferably, an electric telescopic rod is screwed on the top of the two heating tubes, and the electric telescopic rod is located above the top of the second transmission gear. A transmission rod is welded on the output end of the electric telescopic rod, and the bottom end of the transmission rod is connected to the second transmission gear through a universal joint.

[0011] Preferably, a pair of multi-section telescopic rods are screwed between the two pairs of heating tubes, a support block is welded to the outer wall of the other side of the heating tube, and a damping telescopic rod is screwed to the bottom of the support block, a clamping plate is screwed to the telescopic end of the damping telescopic rod, and valve flanges are welded to both ends of the valve body.

[0012] Preferably, a bottom rod is welded between each pair of the heating tubes, a bottom plate is welded on the bottom rod, and two bases are welded on the bottom end surface of the bottom plate, and a power supply is screwed between the two bases.

[0013] Preferably, the bottom rod is located below the bottom of the valve body, and the power source is a detachable battery.

[0014] Preferably, a plurality of slots are equidistantly formed on the top and bottom of the first transmission belt, a plurality of clamping rods are equidistantly welded on the outer walls of the first spur gear and the fourth spur gear, a connecting plate is equidistantly screwed on the bottom end face of the outer shell, and a telescopic guide rod is screwed on one end of the connecting plate away from the outer shell, and the top end of the telescopic guide rod is screwed and fixed to the bottom end face of the valve body.

[0015] Compared with the prior art, the present invention provides a concealed stem wedge-type forged steel gate valve, which has the following beneficial effects: 1. The present invention can remove the water droplets condensed on the outer wall of the valve body by inserting four heating tubes into the periphery of the valve body, and use a motor to drive the cleaning roller and the first bevel gear to rotate, so as to avoid the water droplets hanging on the wall and icing. The heat generated by the electric heating tube will be dissipated to the outside through the heat dissipation port, and the heat can be used to heat the outer wall of the valve body, thereby preventing the valve body from freezing. The first bevel gear can be used to drive the second bevel gear to rotate. When the second bevel gear rotates, under the action of the first transmission gear, the second transmission belt will drive the second transmission gear to rotate, and the first straight gear will be driven to rotate by the first straight gear. The first transmission belt can be fixed from both ends of the first transmission belt through the pulley. At the same time, when the first transmission belt rotates, it will drive the pulley to rotate, and then the screw will rotate. The lifting block will drive the electric heating tube to rise in the heating tube along the trajectory of the lifting groove, adjust the heating position, and expand the heating range. This method can avoid the freezing of the valve body surface due to the circulation of low-temperature medium, thereby ensuring the normal use of the gate valve.

[0016] 2. The hot air in the heating tube can be blown out from the heat dissipation port by a micro fan, and the transmission rod is driven to rise and fall continuously by an electric telescopic rod, so that the positions of the first spur gear and the fourth spur gear can be adjusted. When the first spur gear moves down or the fourth spur gear moves up and enters the first transmission belt, the clamping rod will be clamped into the clamping groove, thereby increasing the connection effect between the first spur gear and the fourth spur gear and the first transmission belt respectively, which is beneficial to improving the transmission performance. The spacing between the heating tubes can be adjusted by using a multi-section telescopic rod, which is convenient for fixing on valve bodies of different sizes. The bottom of the valve body can be supported by the bottom rod, bottom plate and base, and the connecting plate and telescopic guide rod can limit the activity trajectory of the shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is an overall isometric view of the concealed-stem wedge-type forged steel gate valve proposed by the present invention; Figure 2 This is a schematic diagram of the overall structure of the concealed-stem wedge-type forged steel gate valve proposed by the present invention; Figure 3 This is a schematic diagram of the bottom structure of the concealed-stem wedge-type forged steel gate valve proposed by the present invention; Figure 4 A cross-sectional view of a heating pipe of a concealed-stem wedge-type forged steel gate valve proposed by the present invention; Figure 5 It is an overall cross-sectional view of the concealed-stem wedge-type forged steel gate valve proposed by the present invention; Figure 6 The figure is an overall side view of the concealed-stem wedge-type forged steel gate valve proposed by the present invention.

[0018] Explanation of the figure numbers: 1. Valve body; 2. Drive tube; 3. Heating tube; 4. Heat dissipation port; 5. Electric heating tube; 6. Moving port; 7. Lifting slot; 8. Screw rod; 9. Lifting block; 10. Pulley; 11. First transmission belt; 12. Support plate; 13. Motor; 14. Cleaning roller; 15. First bevel gear; 16. Support plate; 17. Second bevel gear; 18. Vertical rod; 19. First transmission gear; 20. Second transmission gear; 21. Connecting rod; 22. Reciprocating assembly; 221. First straight gear ; 222, second spur gear; 223, third spur gear; 224, fourth spur gear; 225, housing; 226, limit plate; 23, second transmission belt; 24, micro fan; 25, electric telescopic rod; 26, transmission rod; 27, multi-section telescopic rod; 28, support block; 29, damping telescopic rod; 30, splint; 31, valve flange; 32, bottom rod; 33, bottom plate; 34, base; 35, power supply; 36, slot; 37, clamping rod; 38, connecting plate; 39, telescopic guide rod. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0020] Example 1

[0021] See also Figure 1-6, a concealed stem wedge-type forged steel gate valve, comprising a valve body 1, a pair of heating tubes 3 are arranged outside on both sides of the valve body 1, and a driving tube 2 is welded to the outer wall of the heating tube 3, a heat dissipation port 4 is opened on the outer wall of the heating tube 3, an electric heating tube 5 is slidably installed inside the heating tube 3, a moving port 6 is opened on the outer wall of the heating tube 3, and the moving port 6 is located on the opposite side of the heat dissipation port 4, a lifting groove 7 is opened inside the driving tube 2, and a screw 8 is installed inside the lifting groove 7 through a bearing, a lifting block 9 is installed on the screw 8 through a thread, and one end of the lifting block 9 passes through the moving port 6 and is screwed and fixed to the electric heating tube 5, one end of the bottom of the screw 8 passes through the driving tube 2 and is welded with a pulley 10, and two pulleys on the same side A first transmission belt 11 is sleeved between the pulleys 10, a support plate 12 is welded to the outer wall of one side of the heating tube 3, and a motor 13 is screwed on the support plate 12, a cleaning roller 14 is provided between the two support plates 12 on the same side, the output end of the motor 13 is fixedly connected to one end of the cleaning roller 14 through a coupling, and the other end of the cleaning roller 14 is connected to a support plate 12 through a bearing, a first bevel gear 15 is welded to the output end of the motor 13, a support plate 16 is provided below the bottom of the motor 13, and one end of the support plate 16 is welded and fixed to the support plate 12, a second bevel gear 17 is meshed at the bottom of the first bevel gear 15, and a vertical rod 1 is welded at the center of the bottom of the second bevel gear 17 8, one end of the bottom of the vertical rod 18 passes through the support plate 16 and is welded with a first transmission gear 19, and a second transmission gear 20 is provided outside the first transmission gear 19, a connecting rod 21 is welded at the bottom center of the second transmission gear 20, and a reciprocating assembly 22 is provided at one end of the bottom of the connecting rod 21, a second transmission belt 23 is sleeved between the first transmission gear 19 and the second transmission gear 20, the reciprocating assembly 22 is located below the bottom of the valve body 1, and the reciprocating assembly 22 includes a first spur gear 221, a second spur gear 222, a third spur gear 223, a fourth spur gear 224, a housing 225 and a limit plate 226, and a first spur gear 221 is welded at one end of the bottom of the connecting rod 21 A spur gear 221, and a second spur gear 222 is welded at the bottom of the first spur gear 221, a third spur gear 223 is meshed at one side of the second spur gear 222, and a fourth spur gear 224 is welded at the bottom of the third spur gear 223, a housing 225 is sleeved on the outside of the second spur gear 222 and the third spur gear 223, a limiting plate 226 is welded on the first spur gear 221 and the fourth spur gear 224, the gear teeth of the first spur gear 221 and the fourth spur gear 224 are meshed with the tooth grooves of the first transmission belt 11, the first spur gear 221 and the fourth spur gear 224 have the same size, and a micro fan 24 is screwed at the bottom of one side of the heating tube 3; By inserting four heating tubes 3 into the periphery of the valve body 1, and using the motor 13 to drive the cleaning roller 14 and the first bevel gear 15 to rotate, the water droplets condensed on the outer wall of the valve body 1 can be swept away to avoid ice formation. The first bevel gear 15 can drive the second bevel gear 17 to rotate. When the second bevel gear 17 rotates, under the action of the first transmission gear 19, the second transmission belt 23 will drive the second transmission gear 20 to rotate, and the first straight gear 221 will rotate through the connecting rod 21. The first straight gear 221 can drive the first transmission belt 11 to rotate, and the first transmission belt 11 can be fixed from both ends through the pulley 10. At the same time, when the first transmission belt 11 rotates, it will drive the pulley 1 0 rotates, thereby rotating the screw rod 8, and the lifting block 9 drives the electric heating tube 5 to rise in the heating tube 3 along the trajectory of the lifting slot 7 to adjust the heating position. When the first spur gear 221 rotates, it drives the second spur gear 222 to drive the third spur gear 223 to rotate, so that the rotation direction of the fourth spur gear 224 is opposite to that of the first spur gear 221. When the fourth spur gear 224 moves into the first transmission belt 11, it drives the pulley 10 to rotate in the opposite direction, thereby causing the electric heating tube 5 to descend in the heating tube 3. The heat generated by the electric heating tube 5 will be dissipated to the outside through the heat dissipation port 4. The heat can be used to heat the outer wall of the valve body 1, thereby preventing the valve body 1 from freezing. The hot air in the heating tube 3 can be blown out from the heat dissipation port 4 through the micro fan 24.

[0022] Example 2

[0023] See also Figure 1-6, which is different from Example 1 in that the tops of the two heating tubes 3 are screwed with electric telescopic rods 25, and the electric telescopic rods 25 are located above the top of the second transmission gear 20, the output end of the electric telescopic rod 25 is welded with a transmission rod 26, and the bottom end of the transmission rod 26 is connected to the second transmission gear 20 through a universal joint, a pair of multi-section telescopic rods 27 are screwed between the two pairs of heating tubes 3, a support block 28 is welded to the outer wall of the other side of the heating tube 3, and a damping telescopic rod 29 is screwed to the bottom of the support block 28, and a clamping plate 30 is screwed to the telescopic end of the damping telescopic rod 29, and valve flanges 31 are welded at both ends of the valve body 1, and a bottom support 27 is welded between each pair of heating tubes 3. Rod 32, a bottom plate 33 is welded on the bottom rod 32, and two bases 34 are welded on the bottom end surface of the bottom plate 33, a power source 35 is screwed between the two bases 34, the bottom rod 32 is located below the bottom of the valve body 1, the power source 35 is a detachable battery, a plurality of card slots 36 are equidistantly provided on the top and bottom of the first transmission belt 11, a plurality of card rods 37 are equidistantly welded on the outer walls of the first spur gear 221 and the fourth spur gear 224, a connecting plate 38 is equidistantly screwed on the bottom end surface of the housing 225, and a telescopic guide rod 39 is screwed on one end of the connecting plate 38 away from the housing 225, and the top end of the telescopic guide rod 39 is screwed and fixed to the bottom end surface of the valve body 1; The transmission rod 26 is driven by the electric telescopic rod 25 to continuously rise and fall, and the positions of the first spur gear 221 and the fourth spur gear 224 can be adjusted. When the first spur gear 221 moves down or the fourth spur gear 224 moves up and enters the first transmission belt 11, the clamping rod 37 will be clamped into the clamping groove 36, thereby increasing the connection effect between the first spur gear 221 and the fourth spur gear 224 and the first transmission belt 11, respectively, which is beneficial to improving the transmission performance. The multi-section telescopic rod 27 can be used to adjust the distance between the heating tubes 3, which is convenient for fixing on valve bodies 1 of different sizes. The bottom rod 32, the bottom plate 33 and the base 34 can support the bottom of the valve body 1. The connecting plate 38 and the telescopic guide rod 39 can limit the activity trajectory of the shell 225. The power supply 35 is used to power the electrical devices used in the equipment.

[0024] The electric heating tube 5, micro fan 24, electric telescopic rod 25 and multi-section telescopic rod 27 used in the present invention are all existing mature technologies, so they are not described in detail. When in use, by plugging the four heating tubes 3 into the periphery of the valve body 1, the motor 13 is used to drive the cleaning roller 14 and the first bevel gear 15 to rotate, the water droplets condensed on the outer wall of the valve body 1 can be swept away to avoid icing. The first bevel gear 15 can drive the second bevel gear 17 to rotate. When the second bevel gear 17 rotates, under the action of the first transmission gear 19, the second transmission belt 23 will drive the second transmission gear 20 to rotate. The first spur gear 221 rotates, and the first spur gear 221 is driven to rotate by the connecting rod 21. The first transmission belt 11 can be fixed at both ends of the first transmission belt 11 by the pulley 10. At the same time, when the first transmission belt 11 rotates, the pulley 10 is driven to rotate, thereby rotating the screw rod 8. The lifting block 9 drives the electric heating pipe 5 to rise in the heating pipe 3 along the trajectory of the lifting groove 7 to adjust the heating position. When the first spur gear 221 rotates, it drives the second spur gear 222 to drive the third spur gear 223 to rotate, so that the rotation direction of the fourth spur gear 224 is adjusted. In the opposite direction to the first spur gear 221, when the fourth spur gear 224 moves into the first transmission belt 11, it will drive the pulley 10 to rotate in the opposite direction, thereby causing the electric heating tube 5 to descend in the heating tube 3, and the heat generated by the electric heating tube 5 will be dissipated to the outside through the heat dissipation port 4. The heat can be used to heat the outer wall of the valve body 1, thereby preventing the valve body 1 from freezing. The hot air in the heating tube 3 can be blown out from the heat dissipation port 4 through the micro fan 24, and the transmission rod 26 can be driven to rise and fall continuously through the electric telescopic rod 25, so that the positions of the first spur gear 221 and the fourth spur gear 224 can be adjusted. The first spur gear 221 When the fourth spur gear 224 moves downward or moves upward into the first transmission belt 11, the clamping rod 37 will be clamped into the clamping groove 36, thereby increasing the connection effect between the first spur gear 221 and the fourth spur gear 224 and the first transmission belt 11 respectively, which is beneficial to improving the transmission performance. The multi-section telescopic rod 27 can be used to adjust the distance between the heating tubes 3, which is convenient for fixing on valve bodies 1 of different sizes. The bottom rod 32, the bottom plate 33 and the base 34 can support the bottom of the valve body 1. The connecting plate 38 and the telescopic guide rod 39 can limit the movement trajectory of the shell 225. The power supply 35 is used to power the electrical devices used in the equipment.

[0025] The above is only a preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of this template.

[0026] In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, and a specific direction structure and operation, and therefore, cannot be understood as a limitation on the present invention. In addition, "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0027] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", etc. should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A concealed stem wedge-type forged steel gate valve, comprising a valve body (1), characterized in that: A pair of heating tubes (3) are provided on the outside of both sides of the valve body (1), and a driving tube (2) is welded to the outer wall of the heating tube (3), a heat dissipation port (4) is provided on the outer wall of the heating tube (3), an electric heating tube (5) is slidably mounted inside the heating tube (3), a moving port (6) is provided on the outer wall of the heating tube (3), and the moving port (6) is located on the opposite side of the heat dissipation port (4), a lifting groove (7) is provided inside the driving tube (2), and a screw (8) is mounted inside the lifting groove (7) via a bearing, A lifting block (9) is threadedly mounted on the screw rod (8), and one end of the lifting block (9) passes through the moving port (6) and is screwed and fixed to the electric heating tube (5). One end of the bottom of the screw rod (8) passes through the driving tube (2) and is welded with a pulley (10). A first transmission belt (11) is sleeved between the two pulleys (10) on the same side. A support plate (12) is welded to the outer wall of one side of the heating tube (3), and a motor (13) is screwed on the support plate (12). A cleaning roller is provided between the two support plates (12) on the same side. (14), the output end of the motor (13) is fixedly connected to one end of the cleaning roller (14) via a coupling, the other end of the cleaning roller (14) is connected to a support plate (12) via a bearing, a first bevel gear (15) is welded to the output end of the motor (13), a support plate (16) is provided below the bottom of the motor (13), and one end of the support plate (16) is welded and fixed to the support plate (12), a second bevel gear (17) is meshed at the bottom of the first bevel gear (15), and the second bevel gear (17) is meshed with the bottom of the first bevel gear (15). A vertical rod (18) is welded at the center of the bottom of the support plate (17); one end of the bottom of the vertical rod (18) passes through the support plate (16) and is welded with a first transmission gear (19); a second transmission gear (20) is arranged outside the first transmission gear (19); a connecting rod (21) is welded at the center of the bottom of the second transmission gear (20); a reciprocating assembly (22) is arranged at one end of the bottom of the connecting rod (21); and a second transmission belt (23) is sleeved between the first transmission gear (19) and the second transmission gear (20).

2. The concealed stem wedge-type forged steel gate valve according to claim 1, characterized in that: The reciprocating assembly (22) is located below the bottom of the valve body (1), and comprises a first spur gear (221), a second spur gear (222), a third spur gear (223), a fourth spur gear (224), a housing (225), and a limit plate (226). The first spur gear (221) is welded to one end of the bottom of the connecting rod (21), and the second spur gear (222) is welded below the bottom of the first spur gear (221). The second spur gear (222) ) is meshed with a third spur gear (223) on one side, and a fourth spur gear (224) is welded below the bottom of the third spur gear (223); the outer parts of the second spur gear (222) and the third spur gear (223) are sleeved with a housing (225); the first spur gear (221) and the fourth spur gear (224) are both welded with a limiting plate (226); the teeth of the first spur gear (221) and the fourth spur gear (224) are both meshed with the tooth grooves of the first transmission belt (11).

3. The concealed stem wedge-type forged steel gate valve according to claim 2, characterized in that: The first spur gear (221) and the fourth spur gear (224) have the same size.

4. The concealed stem wedge-type forged steel gate valve according to claim 1, characterized in that: A micro fan (24) is screwed onto the bottom of one side of the heating tube (3).

5. The concealed stem wedge-type forged steel gate valve according to claim 1, characterized in that: An electric telescopic rod (25) is screwed onto the top of the two heating tubes (3), and the electric telescopic rod (25) is located above the top of the second transmission gear (20). A transmission rod (26) is welded to the output end of the electric telescopic rod (25), and a bottom end of the transmission rod (26) is connected to the second transmission gear (20) via a universal joint.

6. The concealed stem wedge-type forged steel gate valve according to claim 1, characterized in that: A pair of multi-section telescopic rods (27) are screwed between the two pairs of heating tubes (3), a support block (28) is welded to the outer wall of the other side of the heating tube (3), and a damping telescopic rod (29) is screwed to the bottom of the support block (28), a clamping plate (30) is screwed to the telescopic end of the damping telescopic rod (29), and valve flanges (31) are welded to both ends of the valve body (1).

7. The concealed stem wedge-type forged steel gate valve according to claim 1, characterized in that: A bottom rod (32) is welded between each pair of the heating tubes (3), a bottom plate (33) is welded to the bottom rod (32), and two bases (34) are welded to the bottom end surface of the bottom plate (33), and a power source (35) is screwed between the two bases (34).

8. The concealed stem wedge-type forged steel gate valve according to claim 7, characterized in that: The bottom rod (32) is located below the bottom of the valve body (1), and the power source (35) is a detachable storage battery.

9. The concealed stem wedge-type forged steel gate valve according to claim 2, characterized in that: The top and bottom of the first transmission belt (11) are provided with a plurality of slots (36) at equal intervals, the outer walls of the first spur gear (221) and the fourth spur gear (224) are welded with a plurality of clamping rods (37) at equal intervals, the bottom end surface of the housing (225) is screwed with a connecting plate (38) at equal intervals, and the end of the connecting plate (38) away from the housing (225) is screwed with a telescopic guide rod (39), and the top end of the telescopic guide rod (39) is screwed and fixed to the bottom end surface of the valve body (1).

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