A steel pipe quenching device

Abstract

The present application relates to the technical fields of steel pipe quenching, in particular to a steel pipe quenching device. The device comprises a processing table, a feeding device, a quenching coil and a cooling cover located at one side of the quenching coil. The two ends of the cooling cover are respectively an inlet end and a water blocking end. A water spraying mechanism for cooling the steel pipe is arranged at the inlet end of the cooling cover. A water stopping mechanism is further arranged inside the cooling cover. The water stopping mechanism comprises a water stopping plate and a bearing part connected with the water stopping plate. The water stopping plate moves synchronously with the steel pipe. The water stopping plate pushes the cooling liquid in the water storage area to move to the water blocking end, so that the liquid level in the water storage area rises to immerse the inner wall of the steel pipe, realizing efficient cooling of the inner wall of the steel pipe with different inner diameters and improving the cooling effect. At the same time, the cooling liquid is guided to the water discharge area to accumulate impurities, which can cool the inner wall of the steel pipe with different inner diameters and prevent impurities from accumulating in the water discharge area.

Description

Technical Field

[0001] This invention relates to the field of steel pipe quenching technology, and more specifically, to a steel pipe quenching apparatus. Background Technology

[0002] Quenching is a heat treatment process that involves heating steel to above its critical temperature and then cooling it at a rate greater than the critical cooling rate to obtain a non-equilibrium microstructure dominated by martensite. Quenching is the most widely used heat treatment process for steel. Due to special construction requirements, the inner wall of steel pipes needs to be quenched to improve its strength and wear resistance.

[0003] There are many existing technologies for steel pipe quenching equipment, such as:

[0004] Chinese Patent Publication No. CN103305678A discloses a steel pipe inner wall hardening and quenching device. The device features a double-layer copper rod for cooling water, with an induction head at one end and a medium-to-high frequency induction quenching transformer at the other. The double-layer copper rod is supported by a pneumatic support mounted on a quenching train foundation, which is equipped with quenching train tracks. This device enables the inner wall quenching of medium and large diameter steel pipes, ensuring uniform hardened layer thickness, uniform hardness, and a fine and consistent metallographic structure after quenching.

[0005] The above method involves placing the steel pipe horizontally and feeding it into a quenching coil for quenching. However, during quenching, the heated steel pipe needs to be cooled with water. Since the steel pipe is placed horizontally, the water will concentrate at the bottom of the steel pipe due to gravity when cooling the inner wall, which prevents the inside of the steel pipe from being cooled and affects the overall hardness and strength of the steel pipe. Summary of the Invention

[0006] The present invention provides a steel pipe quenching device, which uses a water stop plate to push the coolant in the water storage area toward the water blocking end, so that the liquid level in the water storage area rises to submerge the inner wall of the steel pipe, thereby solving the problem mentioned in the background art, namely: the steel pipe cannot be cooled inside, which affects the overall hardness and strength of the steel pipe.

[0007] To achieve the above objectives, a steel pipe quenching device includes a processing table, a feeding device, a quenching coil, and a cooling hood located on one side of the quenching coil. The two ends of the cooling hood are a feeding end and a water blocking end, respectively. A water spraying mechanism for cooling the steel pipe is provided at the feeding end of the cooling hood. A water-stopping mechanism is also provided inside the cooling hood. The water-stopping mechanism includes a water-stopping plate and a bearing part connected to the water-stopping plate. The water-stopping plate divides its two sides into a water storage area for accumulating water and a water discharge area for receiving impurities falling off the steel pipe, respectively. The water-stopping plate intercepts the cooling water inside the cooling hood and is fitted over the outside of the steel pipe.

[0008] During the process of transporting the steel pipe from the feeding end of the cooling hood to the water blocking end, the bearing part, together with the water stop plate, supports the steel pipe. Then, the movement of the steel pipe drives the bearing part to move the water stop plate. The water stop plate is responsible for pushing the cooling water in the water storage area towards the water blocking end, so that the water level at the water blocking end is higher than the inner diameter of the steel pipe. This allows the overflowing cooling water to immerse the inner wall of the steel pipe, and the cooling water flowing back into the steel pipe washes away the accumulated impurities in the discharge area.

[0009] Based on the above, a water baffle is provided at the water-blocking end of the cooling cover. The water baffle and the water stop plate work together to intercept the cooling water and limit the overflow of the cooling water. The upper edge of the water baffle is higher than the center of the end face of the steel pipe.

[0010] In this way, when the steel pipe passes over the waterstop, the waterstop not only supports the steel pipe, but also peels off impurities from the heated steel pipe surface, causing these impurities to accumulate in the discharge area. In other words, the waterstop also reduces the adhesion of impurities to the steel pipe surface, which is beneficial for direct contact between the cooling water and the steel pipe surface, thus improving the quality of the steel pipe. The waterstop and the baffle plate work together to intercept the cooling water, limiting its overflow and keeping the water storage area in a water-storage state for later cooling of the inside of the steel pipe.

[0011] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0012] 1. In this steel pipe quenching device, the water-stop plate moves synchronously with the steel pipe. The water-stop plate pushes the coolant in the water storage area towards the water-blocking end, causing the liquid level in the water storage area to rise to submerge the inner wall of the steel pipe, thereby achieving efficient cooling of the inner wall of steel pipes with different inner diameters and improving the cooling effect. At the same time, the coolant is guided by the steel pipe to the discharge area to collect impurities, which can both cool the inner wall of steel pipes with different inner diameters and prevent impurities from accumulating in the discharge area.

[0013] 2. In this steel pipe quenching device, the cooling water discharged from the cooling hood impacts the water-blocking plate, causing the water-stopping valve plate to open the drain pipe, thus releasing the residual coolant in the cavity and reducing its impact on the hardness and strength of the steel pipe. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0015] Figure 2 This is a schematic diagram of the steel pipe quenching steps of the present invention;

[0016] Figure 3 This is a cross-sectional schematic diagram of the internal structure of the cooling shroud of the present invention;

[0017] Figure 4 This is a schematic diagram of the steel pipe state of the present invention;

[0018] Figure 5 This is a schematic diagram of the connection structure between the waterstop plate and the bearing plate of the present invention;

[0019] Figure 6 This is a schematic diagram of the steel pipe in state two of the present invention;

[0020] Figure 7 This is a schematic diagram of the steel pipe in state three of the present invention;

[0021] Figure 8 This is an exploded view of the feeding plate and discharge pipe of the present invention;

[0022] Figure 9 For the present invention Figure 7 Enlarged structural diagram at point A in the diagram;

[0023] Figure 10 This is a schematic diagram of the cross-sectional structure of the water spray ring of the present invention;

[0024] Figure 11 This is a schematic diagram illustrating the principle of releasing residual coolant in the cavity according to the present invention.

[0025] The meanings of the labels in the diagram are as follows:

[0026] 100. Machining table; 101. Feeding device; 102. Quenching coil; 103. Reset hydraulic rod;

[0027] 110. Cooling shroud; 111. Water storage area; 112. Water discharge area; 113. Auxiliary plate; 114. Water baffle plate; 115. Material discharge chute; 116. Discharge pipe;

[0028] 120. Spray ring; 121. Inlet pipe; 122. Drain pipe;

[0029] 130. Water shut-off valve plate; 131. Water blocking plate; 132. Slide rod; 133. Support spring;

[0030] 140. Water-stopping mechanism; 141. Water-stopping plate; 142. Bearing plate; 143. Bearing rod; 144. Top plate; 145. Extension plate; 146. Protrusion;

[0031] 150. Feeding plate; 151. Compression spring; 152. Feeding trough; 153. Stop block. Detailed Implementation

[0032] The technical solutions of this invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0033] Therefore, to address the problem that the inability to cool the inside of a steel pipe affects its overall hardness and strength, this invention provides a steel pipe quenching device, as shown in the reference. Figures 1-2 As shown, the device includes a processing table 100, a feeding device 101, a quenching coil 102, and a cooling cover 110 located on one side of the quenching coil 102. The two ends of the cooling cover 110 are the feeding end and the water blocking end, respectively. A water spraying mechanism for cooling the steel pipe is provided at the feeding end of the cooling cover 110. After the steel pipe passes through the quenching coil 102, it gradually enters the processing table 100. The water spraying mechanism achieves the purpose of cooling by spraying water onto the steel pipe to improve its strength and quality.

[0034] Secondly, combining Figure 3 , Figure 4 As shown, a water-stopping mechanism 140 is also provided inside the cooling shroud 110. The water-stopping mechanism 140 includes a water-stopping plate 141 and a supporting part connected to the water-stopping plate 141. The water-stopping plate 141 divides its two sides into a water storage area 111 for accumulating water and a water discharge area 112 for receiving impurities falling off the steel pipe. The water-stopping plate 141 intercepts the cooling water in the cooling shroud 110 and is sleeved on the outside of the steel pipe. During the process of the steel pipe being transported from the feed end of the cooling shroud 110 to the water-blocking end, the supporting part cooperates with the water-stopping plate 141 to support the steel pipe. The movement of the steel pipe drives the supporting part to move the water-stopping plate 141. The water-stopping plate 141 is responsible for pushing the cooling water in the water storage area 111 towards the water-blocking end, so that the water level at the water-blocking end is higher than the inner diameter of the steel pipe, so that the overflowing cooling water can immerse the inner wall of the steel pipe, and the cooling water flowing back in the steel pipe washes away the accumulated impurities in the water discharge area 112.

[0035] Following the cooling of the steel pipe, a material chute for removing the steel pipe is provided at the top of the cooling shroud 110. The size of the material chute is larger than that of the steel pipe. Thus, the use of an external gripping device is existing technology. The figure does not show the removal of the steel pipe from the cooling shroud 110 before proceeding with the cooling of the next steel pipe.

[0036] The cooling process of the steel pipe is described in detail below. First, the water spraying mechanism includes a water spraying ring 120 located near the feed end of the cooling shroud 110 and mounted on the cooling shroud 110. The water spraying ring 120 has a cavity inside, and several water spraying holes are arranged in a circular array along the cavity. The cavity is connected to a water inlet pipe 121 that supplies water to its interior. The water inlet pipe 121 is connected to a pump body. Therefore, during the process of conveying the steel pipe into the cooling shroud 110, the movement of the steel pipe is powered by the hydraulic rod in the feeding device 101. The hydraulic rod drives the steel pipe through the quenching coil 102 and then into the cooling shroud 110. Then, the pump body supplies cooling water to the water spraying ring 120 through the water inlet pipe 121 to cool the heated steel pipe.

[0037] The bearing part includes a bearing plate 142 away from the waterstop plate 141, and a bearing rod 143 fixedly installed between the waterstop plate 141 and the bearing plate 142. Under normal conditions, a reset hydraulic rod 103 fixed on the processing table 100 is provided on one side of the bearing plate 142. The reset hydraulic rod 103 holds the bearing plate 142 against it, thus preventing the steel pipe from rubbing against the waterstop plate 141 and the bearing plate 142 and causing them to move, thereby keeping them in their original positions.

[0038] Furthermore, to further maintain the stability of the waterstop plate 141 and the supporting plate 142, an auxiliary plate 113 is fixedly installed on the inner wall of the cooling shroud 110 near the supporting plate 142. The auxiliary plate 113 is slidably installed with the supporting rod 143, and the auxiliary plate 113 can limit the offset of the supporting rod 143. Secondly, considering that there is a distance between the waterstop plate 141 and the supporting plate 142 during the process of the steel pipe being gradually supplied from the end of the waterstop plate 141 to the supporting plate 142, in order to avoid the phenomenon of the steel pipe being "top-heavy", several top plates 144 are spaced apart on the supporting rod 143. The top plates 144 are fixed on the supporting rod 143 to support the steel pipe. The distance between the top plate 144 closest to the waterstop plate 141 and the waterstop plate 141 is less than half the length of the steel pipe. Figure 4 The diagram shows that the distance between the top plate 144 closest to the waterstop 141 and the waterstop 141 is L1, and half the length of the steel pipe is L2. The length of L1 is less than L2. In this way, before the center of the steel pipe passes over the waterstop 141, its end is already placed on the bearing rod 143. The bearing rod 143 then supports the steel pipe, thereby preventing the head of the steel pipe from drooping and the tail from sticking up.

[0039] When the steel pipe passes over the waterstop plate 141, the waterstop plate 141 not only supports the steel pipe, but also peels off impurities from the heated steel pipe surface, causing the peeled impurities to accumulate in the water discharge area 112. That is, the waterstop plate 141 also reduces the adhesion of impurities to the steel pipe surface, which is conducive to the direct contact between the cooling water and the steel pipe surface and improves the quality of the steel pipe. In addition, during the process of the steel pipe end moving from the waterstop plate 141 to the bearing plate 142, the water spray ring 120 will continuously spray water onto the steel pipe. A water baffle plate 114 is provided at the water blocking end of the cooling cover 110. The waterstop plate 141 and the water baffle plate 114 work together to intercept the cooling water, so as to limit the overflow of the cooling water and keep the water storage area 111 in a water storage state for later cooling of the inside of the steel pipe.

[0040] The following illustrates the working principle of the synchronous movement of the bearing plate 142 and the steel pipe:

[0041] Combination Figure 4 , Figure 5As shown, when the end of the steel pipe moves to the bearing plate 142, an extension plate 145 and a protrusion 146 are fixedly installed on the bearing plate 142. The extension plate 145 matches the lower edge of the steel pipe and supports the steel pipe, while the protrusion 146 abuts against the end of the steel pipe. Thus, the reset hydraulic rod 103 releases the restriction on the bearing plate 142. At this time, the steel pipe continues to move, and the protrusion 146 abuts against the end of the steel pipe, causing the bearing plate 142 and the steel pipe to... Figure 6 The process involves synchronous movement. During this process, after the end of the steel pipe detaches from the spray ring 120, the spray ring 120 ceases spraying water. Because the water-stop plate 141 intercepts one side of the cooling water in the water storage area 111, and a water-blocking plate 114 is provided at the water-blocking end of the cooling cover 110, the water-stop plate 141 moves closer to the water-blocking plate 114. As a result, under the pushing action of the water-stop plate 141, the cooling water space in the water storage area 111 decreases, and the liquid level gradually rises. Furthermore, since the upper edge of the water-blocking plate 114 is higher than the center of the steel pipe end face, the water level in the water storage area 111 rises until it submerges the inner wall of the steel pipe. (Reference) Figure 7 The middle arrow shows the flow process of cooling water overflowing from the water storage area 111 into the steel pipe.

[0042] Furthermore, the baffle plate 114 enables the device to adapt to steel pipes with different inner diameters. That is, when the outer diameter of the steel pipe remains unchanged, its inner diameter changes. The upper edge of the baffle plate 114 is higher than the center of the end face of the steel pipe, which can raise the liquid level in the water storage area 111 to a higher level so that the cooling water can submerge the inner wall of steel pipes with various inner diameters.

[0043] It should be noted that, Figure 5 In the process, when the bearing rod 143 moves laterally, the auxiliary plate 113 is in a fixed state. In order to allow the top plate 144 to pass smoothly, a notch is provided on the auxiliary plate 113 for the top plate 144 to pass through.

[0044] Furthermore, the cooling water inside the steel pipe is affected by gravity, and with the guidance of the steel pipe, the cooling water inside the steel pipe is led to the end for discharge. Since the returning cooling water has a certain kinetic energy, the water stop plate 141 blocks the cooling water flowing into the cooling cover 110, so that the cooling water impacts the accumulated impurities located in the discharge area 112, thereby achieving the purpose of cleaning the impurities and preventing excessive accumulation from affecting the entry of new steel pipes.

[0045] In other words, by means of the synchronous movement of the waterstop plate 141 and the steel pipe, the waterstop plate 141 pushes the coolant in the water storage area 111 towards the water blocking end, so that the liquid level in the water storage area 111 rises to submerge the inner wall of the steel pipe, thereby achieving efficient cooling of the inner wall of steel pipes with different inner diameters and improving the cooling effect; at the same time, in conjunction with the steel pipe, the coolant is guided to the discharge area 112 to accumulate impurities, so as to both cool the inner wall of steel pipes with different inner diameters and prevent impurities from accumulating in the discharge area 112.

[0046] At the same time, combined Figure 7 , Figure 8 , Figure 9 As shown, when the steel pipe moves to its maximum displacement, in order to discharge the cooling water in the water storage area 111, a discharge plate 150 is provided on the inner wall of the cooling shroud 110 near the auxiliary plate 113. The discharge plate 150 is elastically connected to the inner wall of the cooling shroud 110 by a compression spring 151. Several discharge slots 152 are provided on the discharge plate 150, and a discharge chute 115 is provided on the cooling shroud 110 corresponding to the discharge slots 152. A discharge pipe 116 connected to the cooling shroud 110 is provided outside the discharge chute 115. On the other hand, under normal conditions, the discharge slots 152 and the discharge chute 115 are in a misaligned state. A stop block 153 is fixedly provided on the discharge plate 150. Located on the path of the waterstop plate 141, when the waterstop plate 141 pushes the stop block 153 to move, the discharge trough 152 and the discharge trough 115 become overlapping. Therefore, when the waterstop plate 141 moves to contact the stop block 153, the waterstop plate 141 applies a pushing force to the stop block 153 to cause the discharge plate 150 to move against the elastic potential energy of the compression spring 151. During this process, the discharge trough 152 and the discharge trough 115 change from a misaligned state to an overlapping state, and the cooling water in the water storage area 111 is discharged. After the cooling water is discharged, the steel pipe corresponds to the material picking trough above the cooling cover 110, and then the steel pipe in the cooling cover 110 can be taken out with the help of the external gripping device.

[0047] Conversely, when the waterstop plate 141 moves in the reverse direction to reset, the bearing plate 142 can be moved in the reverse direction by the reset hydraulic rod 103. Under the elastic action of the compression spring 151, the discharge plate 150 is pushed to move in the reverse direction, so that the discharge trough 152 and the discharge trough 115 are restored to the misaligned state.

[0048] Combination Figure 10 As shown, when water injection stops inside the spray ring 120, coolant will remain in the cavity of the spray ring 120. The temperature of this residual coolant is usually higher than that of the new coolant. When a new steel pipe enters the cooling process, the relatively high temperature of the surrounding residual coolant will affect the quenching effect of the steel pipe. That is, the coolant sprayed onto the new steel pipe first will be at a higher temperature.

[0049] Therefore, in combination Figure 11 As shown, a drain pipe 122 connected to the inlet pipe 121 is provided. A water-blocking valve plate 130 is provided in the drain pipe 122 to intercept the coolant. When the steel pipe is cooled, the water-blocking valve plate 130 is in a state of blocking the drain pipe 122 to restrict the coolant in the inlet pipe 121 from being discharged from the drain pipe 122; conversely, the water-blocking valve plate 130 releases the restriction on the coolant, and the coolant in the cavity is released.

[0050] Therefore, when the coolant in the cavity needs to be released, a water-blocking plate 131 is fixedly installed at the bottom of the water-blocking valve plate 130, and a sliding rod 132 is slidably installed on the water-blocking plate 131. The top of the sliding rod 132 is fixed to the drain pipe 122, and a support spring 133 is elastically connected between the bottom of the water-blocking plate 131 and the sliding rod 132. Therefore, in the initial state, the support spring 133 supports the water-blocking plate 131. At this time, the water-blocking valve plate 130 blocks the drain pipe 122, restricting the discharge of coolant.

[0051] Conversely, when the cooling water in the cooling shroud 110 is discharged from the feed end, the water baffle 131 extends outward beyond the feed end face of the cooling shroud 110. In this way, the coolant discharged from the feed end can impact the water baffle 131, causing it to overcome the elastic potential energy of the support spring 133 and move downward. The water baffle 131 then drives the water shut-off valve plate 130 to move downward and open the drain pipe 122. In summary, by using the cooling water discharged from the cooling shroud 110 to impact the water baffle 131, the water shut-off valve plate 130 is made to open the drain pipe 122, thus releasing the residual coolant in the cavity and reducing the impact on the hardness and strength of the steel pipe.

[0052] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A steel pipe quenching device, comprising a processing table (100), a feeding device (101), a quenching coil (102), and a cooling shroud (110) located on one side of the quenching coil (102), wherein the two ends of the cooling shroud (110) are a feeding end and a water blocking end, respectively, and a water spraying mechanism for cooling the steel pipe is provided at the feeding end of the cooling shroud (110), characterized in that: A water-stopping mechanism (140) is also provided inside the cooling cover (110). The water-stopping mechanism (140) includes a water-stopping plate (141) and a bearing part connected to the water-stopping plate (141). The water-stopping plate (141) divides its two sides into a water storage area (111) for accumulating water and a water discharge area (112) for receiving impurities falling off the steel pipe. The water-stopping plate (141) intercepts the cooling water in the cooling cover (110) and is fitted over the outside of the steel pipe. During the process of conveying the steel pipe from the feeding end of the cooling cover (110) to the water blocking end, the bearing part cooperates with the water stop plate (141) to support the steel pipe. Then, the movement of the steel pipe drives the bearing part to move the water stop plate (141). The water stop plate (141) is responsible for pushing the cooling water in the water storage area (111) towards the water blocking end, so that the water level at the water blocking end is higher than the inner diameter of the steel pipe, so that the overflowing cooling water can immerse the inner wall of the steel pipe, and the cooling water flowing back in the steel pipe can wash away the accumulated impurities in the water discharge area (112).

2. The steel pipe quenching device according to claim 1, characterized in that: The water spraying mechanism includes a water spraying ring (120) located near the feed end of the cooling shroud (110) and disposed on the cooling shroud (110). The water spraying ring (120) has a cavity inside, and the cavity is connected to a water inlet pipe (121) that supplies water to its interior.

3. The steel pipe quenching device according to claim 2, characterized in that: The bearing portion includes a bearing plate (142) away from the waterstop plate (141) and a bearing rod (143) fixedly disposed between the waterstop plate (141) and the bearing plate (142). Under normal conditions, a reset hydraulic rod (103) fixed on the processing table (100) is provided on one side of the bearing plate (142).

4. The steel pipe quenching device according to claim 3, characterized in that: An auxiliary plate (113) is fixedly provided on the inner wall of the cooling cover (110) near the support plate (142). The auxiliary plate (113) is slidably disposed with the support rod (143), and the auxiliary plate (113) can limit the offset of the support rod (143).

5. The steel pipe quenching device according to claim 4, characterized in that: A number of top plates (144) are provided at intervals on the support rod (143), the top plates (144) are fixed on the support rod (143), and a notch is provided on the auxiliary plate (113) for the top plates (144) to pass through; The distance between the top plate (144) closest to the waterstop plate (141) and the waterstop plate (141) is less than half the length of the steel pipe.

6. The steel pipe quenching device according to claim 1, characterized in that: When the steel pipe passes over the waterstop (141), the waterstop (141) is used to peel off the impurities on the surface of the heated steel pipe so that the peeled impurities accumulate in the drainage area (112).

7. The steel pipe quenching device according to claim 1, characterized in that: A water baffle plate (114) is provided at the water blocking end of the cooling cover (110). The water stop plate (141) and the water baffle plate (114) work together to intercept the cooling water and limit the overflow of the cooling water. The upper edge of the water baffle plate (114) is higher than the center of the end face of the steel pipe.

8. The steel pipe quenching device according to claim 3, characterized in that: An extension plate (145) and a protrusion (146) are fixedly provided on the bearing plate (142). The extension plate (145) matches the lower edge of the steel pipe, and the protrusion (146) abuts against the end of the steel pipe.

9. The steel pipe quenching device according to claim 4, characterized in that: A feeding plate (150) is provided on the inner wall of the cooling cover (110) near the auxiliary plate (113). The feeding plate (150) is elastically connected to the inner wall of the cooling cover (110) by a compression spring (151). A plurality of feeding grooves (152) are provided on the feeding plate (150). A discharge groove (115) is provided on the cooling cover (110) corresponding to the feeding groove (152). A discharge pipe (116) connected to the cooling cover (110) is provided outside the discharge groove (115). Under normal conditions, the feeding trough (152) and the discharge trough (115) are misaligned. A stop block (153) is fixedly installed on the feeding plate (150). The stop block (153) is located on the path of the waterstop plate (141). When the waterstop plate (141) pushes the stop block (153) to move, the feeding trough (152) and the discharge trough (115) become overlapping.

10. The steel pipe quenching device according to claim 2, characterized in that: A drain pipe (122) is provided on the inlet pipe (121) and communicates with it. A water-blocking valve plate (130) for intercepting coolant is provided inside the drain pipe (122). A water-blocking plate (131) is fixedly provided at the bottom of the water-blocking valve plate (130). A sliding rod (132) is slidably provided on the water-blocking plate (131). The top of the sliding rod (132) is fixed to the drain pipe (122). A support spring (133) is elastically connected between the bottom of the water-blocking plate (131) and the sliding rod (132). The water-blocking plate (131) extends outward beyond the feed end face of the cooling shroud (110).

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