A double butterfly valve for a wet concrete spraying machine

Abstract

This invention discloses a double butterfly valve for a wet concrete spraying machine, relating to the field of butterfly valve technology. It includes a valve body, with a rotating shaft rotatably mounted inside the top of the valve body, an upper bushing rotatably mounted on the outer surface of the bottom of the rotating shaft, and a lower pressure cap inserted into the center of the bottom of the valve body. It also includes an anti-breakage component and a sealing component. The anti-breakage component is used to prevent excessive reverse torque from impacting the butterfly valve during use, which could cause the drive component to rotate in reverse and damage it. The anti-breakage component includes an upper shaft, a middle shaft, a locking rod, a threaded connecting rod, a locking block, and a limiting spring. Through the locking rod, threaded connecting rod, and locking block, during the opening of the butterfly plate and material conveying, it avoids excessive reverse torque on the butterfly plate, preventing reverse rotation and the subsequent reverse rotation of the drive component due to reverse torque transmitted through the rotating shaft. This reduces the impact and wear on the motor or other transmission devices.

Description

Technical Field

[0001] This invention relates to the field of butterfly valve technology, specifically a double butterfly valve for a wet concrete spraying machine. Background Technology

[0002] A butterfly valve, also known as a flap valve, is a simple regulating valve that can be used for on / off control of low-pressure pipeline media. A butterfly valve is a type of valve in which the closing element (valve disc or butterfly plate) is a disc that rotates around the valve shaft to achieve opening and closing. To ensure the pressure resistance and stability of the butterfly valve, most existing butterfly valves adopt a double eccentric structure, that is, the valve stem axis is offset from both the valve stem center and the valve body center, thereby reducing the excessive compression between the butterfly plate and the valve seat and reducing the torque when the butterfly valve is opened.

[0003] When the pump conveying the medium malfunctions or stops working due to power outage, the fluid will flow in reverse under the action of gravity or other external pressure. When the medium flows in the forward direction, the fluid pressure helps to enhance the sealing effect. However, in the reverse flow situation, as the back pressure (i.e., the outlet side pressure) rises, the reverse thrust acting on the butterfly plate increases, which may lead to insufficient contact pressure between the butterfly plate and the valve seat, making it unable to effectively resist the medium pressure, thus creating gaps and causing leakage. In addition, the reverse thrust acting on the butterfly plate will act on the drive device through the butterfly plate, causing the drive device composed of worm gear and worm to be subjected to excessive reverse torque and wear.

[0004] To address this issue, we propose a double butterfly valve for wet concrete spraying machines. Summary of the Invention

[0005] Technical problems to be solved

[0006] In view of this, and in view of the shortcomings of the prior art, the present invention provides a double butterfly valve for a wet concrete spraying machine to solve the problems mentioned in the background art.

[0007] Technical solution

[0008] To achieve the above objectives, the present invention provides the following technical solution: a double butterfly valve for a wet concrete spraying machine, comprising a valve body, a rotating shaft rotatably mounted inside the top of the valve body, an upper shaft sleeve rotatably mounted on the outer surface of the bottom of the rotating shaft, a lower pressure cover inserted and mounted at the center of the bottom of the valve body, and further comprising an anti-breakage component and a sealing component.

[0009] The anti-breakage component is used to prevent the butterfly valve from being damaged by excessive reverse torque due to impact during use, which could cause the drive component to reverse.

[0010] The anti-breakage assembly includes an upper shaft, a middle shaft, a snap-fit ​​rod, a threaded connecting rod, a snap-fit ​​block, and a limit spring;

[0011] The upper shaft is fixedly installed on the surface at the center of the bottom end of the rotating shaft;

[0012] The central shaft is rotatably connected to the center of the bottom end of the upper shaft, and the upper shaft and the central shaft are coaxially arranged.

[0013] The snap-fit ​​rod is fixedly installed at the center of the top surface of the central shaft;

[0014] The threaded connecting rod is fixedly installed at the center of the top surface of the snap-fit ​​rod;

[0015] The snap-fit ​​block is fixedly installed on the inner surface of the upper shaft;

[0016] The limiting spring is located on the top surface of the central shaft and is sleeved on the outside of the snap-fit ​​rod;

[0017] The sealing assembly is used in conjunction with the anti-breakage assembly to further ensure a secure connection between the upper shaft and the middle shaft.

[0018] Preferably, the sealing assembly includes a lower shaft, a limiting block, a limiting ring, a wedge, a snap-fit ​​positioning block, and a support spring;

[0019] The lower shaft is fixedly installed on the upper surface of the top of the lower pressure cover;

[0020] The limiting blocks are symmetrically arranged and fixedly installed on the upper surface of the lower shaft;

[0021] The limiting rings are symmetrically arranged and rotatably mounted on the surface of the limiting block;

[0022] The wedge is fixedly connected to the center of the bottom surface of the central shaft;

[0023] The snap-fit ​​positioning blocks are symmetrically arranged and fixedly connected to the outer surfaces of both sides of the wedge block;

[0024] The support spring is sleeved on the outside of the bottom end of the wedge.

[0025] Preferably, it also includes a butterfly plate that is fixedly installed on the outer surface of the central shaft by bolts, and a pressure plate that is fixedly installed on the outer surface of the butterfly plate on the side away from the central shaft by bolts. A sealing ring is detachably fixedly installed on the inner wall of one side surface of the valve body, and the pressure plate and the sealing ring are in contact.

[0026] Preferably, a threaded groove is provided in the middle of the bottom end of the upper shaft rod, and the upper shaft rod is threadedly connected to the threaded connecting rod through the threaded groove. An installation groove is provided in the center of the bottom end of the upper shaft rod, which consists of a frustum groove and a cylindrical groove. A disc is fixedly connected to the outer surface of the middle shaft rod, and the surface of the disc is in contact with the upper end groove wall of the frustum groove.

[0027] Preferably, the snap-fit ​​blocks are disposed inside the cylindrical groove, and a volume cavity is formed between the two opposing surfaces on both sides of the snap-fit ​​blocks. The snap-fit ​​rod is snap-fitted between the two snap-fit ​​blocks, and the outer surfaces on both sides of the snap-fit ​​blocks extend into the interior of the volume cavity. The two ends of the limiting spring abut against the top surface of the central shaft and the bottom surface of the disc, respectively.

[0028] Preferably, a snap-fit ​​cavity is formed between the valve body and the upper surface of the lower pressure cover. The lower shaft, the limiting block, the limiting ring, the wedge, the snap-fit ​​positioning block, and the support spring are all disposed inside the snap-fit ​​cavity. The middle shaft is installed at the center of the upper surface of the lower shaft by inserting the wedge.

[0029] Preferably, the two symmetrically arranged limiting blocks each have a receiving cavity inside, and the limiting ring, wedge block and snap-fit ​​positioning block are rotatably connected inside the receiving cavity. The two sides of the surface of the two limiting blocks that are close to each other form a lifting groove, and the size of the lifting groove is adapted to the snap-fit ​​positioning block.

[0030] Preferably, the surface of the snap-fit ​​positioning block is fixedly connected with a protrusion, and the inner ring surface of the two limiting rings is fixedly connected with an abutment block. The abutment blocks located on the two limiting rings are arranged symmetrically at the center, and the protrusions on the two snap-fit ​​positioning blocks abut against the two abutment blocks respectively.

[0031] Preferably, the bottom end of the support spring abuts against the upper surface of the lower shaft.

[0032] Preferably, the upper shaft, middle shaft, and lower shaft are all rotatably connected to the internal seal of the valve body.

[0033] Compared with the prior art, the present invention provides a double butterfly valve for a wet concrete spraying machine, which has the following beneficial effects:

[0034] By using the locking rod, threaded connecting rod, and locking block, the reverse rotation of the butterfly plate is prevented due to excessive reverse torque during the opening and material conveying process. This effectively prevents the butterfly plate from reversing due to reverse torque, and thus prevents the drive components from rotating in the opposite direction by transmitting torque through the rotating shaft. This reduces the impact and wear on the motor or other transmission devices.

[0035] The locking rod, threaded connecting rod, locking block, and limit spring ensure a stable connection between the upper and middle shafts when the butterfly valve rotates forward to open, thus guaranteeing its normal operation. Furthermore, when the butterfly valve rotates in the reverse direction, the locking rod maintains its positional stability without affecting the drive components. By limiting unnecessary movement, the risk of sudden pressure changes due to accidental closure is reduced. Additionally, if the locking block breaks due to excessive reverse torque, it can be easily replaced, allowing the butterfly valve to continue operating normally and extending its service life.

[0036] By using a limiting ring, wedge, snap-fit ​​positioning block, and support spring, the butterfly plate moves the pressure plate upward to a certain extent when it opens, thus ensuring that the top of the butterfly plate and pressure plate is in close contact with the inner wall of the valve body. This increases the sealing performance at the top of the connection between the butterfly plate and the valve body, effectively preventing media leakage from the top of the valve under high pressure or high flow conditions. The good sealing condition also helps protect internal parts from corrosion.

[0037] During the upward movement of the central shaft under the action of the wedge, it simultaneously acts on the threaded connecting rod and the upper shaft, further enhancing the stable connection between the upper shaft and the central shaft, thereby preventing the threaded connection between the upper shaft and the threaded connecting rod from failing and becoming loose.

[0038] When the butterfly plate rotates to close the butterfly valve, it will contact the bottom surface of the valve body and generate friction, scraping off the deposited concrete material at the bottom of the valve body. This effectively removes materials that may accumulate at the bottom of the valve body, avoiding pipe or valve blockage caused by excessive deposits and ensuring smooth fluid flow. Residual concrete material adhering to the valve body surface for a long time will accelerate component aging. Regular self-cleaning can reduce wear and corrosion of the valve body. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the overall appearance and structure of the present invention;

[0040] Figure 2 This is a schematic diagram of the internal cross-sectional structure of the valve body of the present invention;

[0041] Figure 3 This is a schematic planar cross-sectional view of the valve body of the present invention.

[0042] Figure 4 This is a schematic cross-sectional view of the butterfly plate of the present invention;

[0043] Figure 5 For the present invention Figure 4 Enlarged schematic diagram of the structure at point A in the middle;

[0044] Figure 6 This is a schematic cross-sectional view of the butterfly plate of the present invention;

[0045] Figure 7 This is a schematic diagram of the cross-sectional structure at the upper shaft of the present invention;

[0046] Figure 8 For the present invention Figure 7 Enlarged schematic diagram of the structure at point B;

[0047] Figure 9 This is a schematic diagram of the internal cross-sectional structure of the shaft in this invention;

[0048] Figure 10This is a schematic diagram of the connection relationship at the limiting block of the present invention;

[0049] Figure 11 This is a schematic diagram of the connection relationship at the wedge block of the present invention;

[0050] Figure 12 This is a schematic cross-sectional view of the limiting block of the present invention.

[0051] In the diagram: 11. Valve body; 12. Rotary shaft; 13. Upper bushing; 14. Lower pressure cap;

[0052] 21. Upper shaft; 22. Middle shaft; 23. Snap-fit ​​rod; 24. Threaded connecting rod; 25. Snap-fit ​​block; 26. Limiting spring;

[0053] 31. Lower shaft; 32. Limiting block; 33. Limiting ring; 34. Wedge block; 35. Snap-fit ​​positioning block; 36. Support spring;

[0054] 41. Butterfly plate; 42. Pressure plate; 43. Sealing ring. Detailed Implementation

[0055] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0056] Embodiments of the present invention

[0057] Please see Figures 1 to 11 A double butterfly valve for a wet concrete spraying machine includes a valve body 11, a rotating shaft 12 rotatably mounted inside the top of the valve body 11, an upper bushing 13 rotatably mounted on the outer surface of the bottom of the rotating shaft 12, a lower pressure cover 14 inserted and mounted at the center of the bottom of the valve body 11, and also includes an anti-breakage component and a sealing component.

[0058] The anti-breakage component is used to prevent excessive reverse torque caused by impact during the use of the butterfly valve, which could reverse the drive component and cause damage.

[0059] The anti-breakage assembly includes an upper shaft 21, a middle shaft 22, a snap-fit ​​rod 23, a threaded connecting rod 24, a snap-fit ​​block 25, and a limit spring 26.

[0060] The upper shaft 21 is fixedly installed on the surface at the center of the bottom end of the rotating shaft 12.

[0061] The central shaft 22 is rotatably connected to the center of the bottom end of the upper shaft 21, and the upper shaft 21 and the central shaft 22 are coaxially arranged.

[0062] The snap-fit ​​rod 23 is fixedly installed at the center of the top surface of the central shaft rod 22.

[0063] The threaded connecting rod 24 is fixedly installed at the center of the top surface of the snap-fit ​​rod 23.

[0064] The snap-fit ​​block 25 is fixedly installed on the inner surface of the upper shaft 21.

[0065] The limiting spring 26 is disposed on the top surface of the central shaft 22 and is sleeved on the outside of the locking rod 23.

[0066] The upper shaft 21 has a threaded groove in the middle of its bottom end. The upper shaft 21 is threaded to the threaded connecting rod 24 through the threaded groove. The upper shaft 21 has an installation groove in the center of its bottom end. The installation groove consists of a frustum groove and a cylindrical groove. A disc is fixedly connected to the outer surface of the middle shaft 22. The surface of the disc fits against the upper wall of the frustum groove.

[0067] The snap-fit ​​block 25 is located inside the cylindrical groove, and the two snap-fit ​​blocks 25 form a volume cavity between their opposite sides. The snap-fit ​​rod 23 is snap-fitted between the two snap-fit ​​blocks 25. The outer surfaces of the two sides of the snap-fit ​​block 25 extend into the volume cavity. The two ends of the limiting spring 26 abut against the top surface of the central shaft rod 22 and the bottom surface of the disc, respectively.

[0068] In an alternative embodiment, see [reference] Figure 1 , Figure 2 , Figure 3 and Figure 4 When in use, the valve body 11 is installed between the two pipe sections at the concrete output end of the wet concrete spraying machine, and the valve body 11 is fixed to the pipe by bolts or other means. At the same time, the rotating shaft 12 needs to be fixedly installed with the driving component formed by the worm gear, so as to ensure that the rotating shaft 12 drives the upper shaft 21 and the lower shaft 31 to rotate inside the valve body 11 under the action of the driving component, thereby driving the butterfly plate 41 to unfold and open the butterfly valve.

[0069] In an alternative embodiment, see [reference] Figure 7 and Figure 8 When the upper shaft 21 and the middle shaft 22 are installed, the upper shaft 21 is threadedly connected to the threaded groove at the bottom of the upper shaft 21 through the threaded connecting rod 24. At this time, the snap-fit ​​block 25 limits the position of the snap-fit ​​rod 23 inserted inside it. After the upper shaft 21 and the middle shaft 22 are installed, the disc on the outer surface of the snap-fit ​​rod 23 will abut against the top surface of the groove wall of the frustum groove, and the limiting spring 26 will be compressed under the combined action of the disc and the top surface of the middle shaft 22.

[0070] In an alternative embodiment, see [reference] Figure 7 and Figure 8When the rotating shaft 12 rotates in the forward direction under the action of the driving component, that is, the upper shaft 21 drives the middle shaft 22 to rotate in the forward direction, thereby driving the butterfly plate 41 to rotate and opening the butterfly valve, the above process is realized through the threaded connection between the upper shaft 21 and the threaded connecting rod 24.

[0071] It should be noted that when the butterfly valve is first activated, the concrete material in the pipeline passes through the butterfly valve, and the material conveying will have a certain impact on the butterfly plate 41 itself. Part of the impact force will be in the direction of rotation of the butterfly plate 41 and will not affect the butterfly plate 41. When the concrete material is backflowing inside the pipeline due to changes in conveying force, the reverse impact force of the concrete material will cause the butterfly plate 41 to rotate in the opposite direction, and then act on the driving component through the central shaft 22 and the upper shaft 21.

[0072] As the reverse rotation torque gradually increases, the reverse rotation of the butterfly plate 41 will damage the driving components in the long term, causing damage to the driving components. Therefore, as the reverse rotation torque of the butterfly plate 41 gradually increases, the locking rod 23, which was originally locked by the locking block 25, will rotate in the reverse direction inside the locking rod 23.

[0073] Since the driving components connected to the upper shaft 21 and the rotating shaft 12 are mostly worm gears, the driving components themselves have self-locking properties, which to a certain extent inhibit the reverse rotation of the upper shaft 21. Therefore, in the above process, the upper shaft 21 will tend to be stationary under the restriction of the driving components.

[0074] It should be noted that the material of the snap-fit ​​block 25 is PET, which has a different hardness compared to the metal structure of the upper shaft 21, lower shaft 31, snap-fit ​​rod 23 and threaded connecting rod 24. Therefore, under the action of the snap-fit ​​rod 23 rotating in the opposite direction, there will be hard compression between the snap-fit ​​rod 23 and the snap-fit ​​block 25. After the torque reaches a certain level, the snap-fit ​​block 25 will break until it can no longer restrict the position of the snap-fit ​​rod 23. At this time, the snap-fit ​​rod 23 can rotate in the opposite direction inside the upper shaft 21.

[0075] It should also be noted that the reverse rotation of the locking rod 23 will not drive the upper shaft 21 to rotate in the opposite direction through the threaded connection, thus not affecting the reverse rotation of the drive component and causing damage to the drive component. In addition, the PET material of the locking block 25 and the amount of torque it can withstand before breaking need to be determined based on the different materials of the locking rod 23 and the butterfly valve itself. It needs to be calculated specifically for different materials, so it will not be elaborated here.

[0076] Further embodiments

[0077] Please see Figures 4 to 6 and Figures 10 to 12The double butterfly valve for wet concrete spraying machine also includes a sealing component, which is used in conjunction with the anti-breakage component to further ensure a stable connection between the upper shaft 21 and the middle shaft 22.

[0078] The sealing assembly includes a lower shaft 31, a limiting block 32, a limiting ring 33, a wedge 34, a snap-fit ​​positioning block 35, and a support spring 36;

[0079] The lower shaft 31 is fixedly installed on the upper surface of the top of the lower pressure cover 14;

[0080] Limiting blocks 32 are symmetrically arranged and fixedly installed on the upper surface of the lower shaft 31;

[0081] The limiting ring 33 is symmetrically arranged and rotatably mounted on the surface of the limiting block 32;

[0082] Wedge 34 is fixedly connected to the center of the bottom surface of the central shaft 22;

[0083] The snap-fit ​​positioning blocks 35 are symmetrically arranged and fixedly connected to the outer surfaces of both sides of the wedge block 34;

[0084] The support spring 36 is sleeved on the outside of the bottom end of the wedge block 34.

[0085] The valve body 11 and the upper surface of the lower pressure cover 14 form a snap-fit ​​cavity. The lower shaft 31, the limiting block 32, the limiting ring 33, the wedge block 34, the snap-fit ​​positioning block 35, and the support spring 36 are all located inside the snap-fit ​​cavity. The central shaft 22 is installed at the center of the upper surface of the lower shaft 31 by inserting the wedge block 34.

[0086] The two symmetrically arranged limiting blocks 32 each have a receiving cavity inside. The limiting ring 33, wedge block 34 and snap-fit ​​positioning block 35 are rotatably connected inside the receiving cavity. The two sides of the surface of the two limiting blocks 32 that are close to each other form a lifting groove. The size of the lifting groove is adapted to the snap-fit ​​positioning block 35.

[0087] The surface of the snap-fit ​​positioning block 35 is fixedly connected with a protrusion, and the inner ring surface of the two limiting rings 33 is fixedly connected with an abutment block. The abutment blocks on the two limiting rings 33 are arranged symmetrically at the center, and the protrusions on the two snap-fit ​​positioning blocks 35 abut against the two abutment blocks respectively.

[0088] The bottom end of the support spring 36 abuts against the upper surface of the lower shaft 31.

[0089] The upper shaft 21, the middle shaft 22, and the lower shaft 31 are all rotatably and sealed to the inside of the valve body 11.

[0090] In an alternative embodiment, see [reference] Figure 4 , Figure 5 and Figures 10 to 12When the central shaft 22 and the butterfly plate 41 rotate in the forward direction to open the butterfly valve, the wedge block 34 fixedly connected to the bottom end of the central shaft 22 will rotate along with it and drive the locking positioning block 35 to rotate.

[0091] Furthermore, since the surface of the snap-fit ​​positioning block 35 is fixedly connected with protrusions, and the inner ring surfaces of the two limiting rings 33 are fixedly connected with abutment blocks, the abutment blocks located on the two limiting rings 33 are centrally symmetrically arranged, and the protrusions located on the two snap-fit ​​positioning blocks 35 abut against the two abutment blocks respectively. Therefore, the rotation of the snap-fit ​​positioning block 35 will drive the symmetrically arranged limiting rings 33 to rotate inside the limiting block 32.

[0092] As the central shaft 22 drives the butterfly plate 41 to rotate to ninety degrees and fully open, the locking and positioning block 35 will rotate into the lifting groove formed by the two sides of the surface of the two limit blocks 32 that are close to each other. Then, the locking and positioning block 35 will rise to a certain extent inside the lifting groove.

[0093] It should be noted that during the above process, the support spring 36 located at the bottom of the wedge 34 is initially in a compressed state. Therefore, when the locking and positioning block 35 rotates into the lifting groove, the wedge 34 and the locking and positioning block 35 will move upward under the force of the support spring 36.

[0094] Therefore, the central shaft 22, which is fixedly connected to the wedge block 34, will move upward to a certain extent. By abutting upward with the central shaft 22, the butterfly plate 41 and pressure plate 42 on the outer surface of the central shaft 22 will further contact the sealing ring 43, thus ensuring the sealing performance between the sealing ring 43 and the butterfly plate 41.

[0095] In an alternative embodiment, see [reference] Figure 8 and Figure 10 During the upward movement of the central shaft 22, the connection between the upper shaft 21 and the central shaft 22 is further ensured by the snap-fit ​​rod 23 and the threaded connecting rod 24, thereby further stabilizing the position of the butterfly plate 41 and ensuring that the butterfly plate 41 can be opened normally inside the butterfly valve during normal use.

[0096] In an alternative embodiment, see [reference] Figure 10 and Figure 11 In the initial state, the limiting block 32 and the limiting ring 33 limit the position of the wedge block 34 and the snap-fit ​​positioning block 35.

[0097] Further embodiments

[0098] Please see Figures 1 to 3 , Figure 6 and Figure 9The double butterfly valve for wet concrete spraying machine also includes a butterfly plate 41 that is fixedly installed on the outer surface of the central shaft 22 by bolts. A pressure plate 42 is fixedly installed on the outer surface of the butterfly plate 41 away from the central shaft 22 by bolts. A sealing ring 43 is detachably fixedly installed on the inner wall of one side surface of the valve body 11. The pressure plate 42 and the sealing ring 43 are in contact.

[0099] In an alternative embodiment, see [reference] Figure 6 , Figure 9 and Figure 10 When the butterfly plate 41 is opened, the butterfly plate 41 will move upward to a certain extent under the action of the central shaft 22 and make a certain contact with the top of the sealing ring 43, which strengthens the sealing of the top of the butterfly valve without affecting the conveying of concrete in the pipeline.

[0100] During the subsequent closing of the butterfly valve, i.e., the butterfly plate 41 rotates 90 degrees in the opposite direction, the locking positioning block 35 will re-contact with the inside of the limiting block 32 and be restricted by the limiting block 32, returning to its initial state. Therefore, the bottom of the butterfly plate 41 will re-contact with the bottom surface of the valve body 11 and generate friction during rotation. Without affecting the performance of the butterfly valve itself, the residual concrete material inside the valve body 11 will be scraped away, avoiding affecting the next rotation and opening of the butterfly plate 41.

[0101] It should be noted that during the conveying of concrete materials, the concrete material accumulates inside the valve body 11 due to gravity, mostly at the bottom of the valve body 11. Therefore, the friction between the bottom of the butterfly plate 41 and the bottom surface of the valve body 11 will scrape off this part of the concrete material, preventing the concrete material from solidifying inside the valve body 11.

[0102] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0103] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A double butterfly valve for a wet concrete spraying machine, comprising a valve body (11), a rotating shaft (12) rotatably mounted inside the top of the valve body (11), an upper bushing (13) rotatably mounted on the outer surface of the bottom of the rotating shaft (12), and a lower pressure cap (14) inserted into the center of the bottom of the valve body (11), characterized in that: Also include anti-collapse components and sealing components; The anti-collapse component is used to prevent the butterfly valve from being affected by the excessive reverse torque impact during use, thereby preventing the driving member from being damaged due to reverse rotation. The anti-collapse component includes an upper shaft rod (21), a middle shaft rod (22), a clamping rod (23), a threaded connecting rod (24), a clamping block (25), and a limiting spring (26). The upper shaft rod (21) is fixedly installed on the surface of the center of the bottom end of the rotating shaft (12). The middle shaft rod (22) is rotatably connected to the center of the bottom end of the upper shaft rod (21), and the upper shaft rod (21) and the middle shaft rod (22) are coaxially arranged. The clamping rod (23) is fixedly installed on the center of the top surface of the middle shaft rod (22). The threaded connecting rod (24) is fixedly installed on the center of the top surface of the clamping rod (23). The clamping block (25) is fixedly installed on the inner surface of the upper shaft rod (21). The limiting spring (26) is arranged on the top surface of the middle shaft rod (22) and is sleeved on the outside of the clamping rod (23). The sealing component is used in cooperation with the anti-collapse component to further ensure the stable connection between the upper shaft rod (21) and the middle shaft rod (22).

2. A double butterfly valve for a wet-type concrete sprayer according to claim 1, wherein: The sealing component includes a lower shaft rod (31), a limiting block (32), a limiting ring (33), a wedge block (34), a clamping positioning block (35), and a supporting spring (36). The lower shaft rod (31) is fixedly installed on the upper surface of the top of the lower cover (14). The limiting block (32) is symmetrically arranged and fixedly installed on the upper surface of the lower shaft rod (31). The limiting ring (33) is symmetrically arranged and rotatably installed on the surface of the limiting block (32). The wedge block (34) is fixedly connected to the center of the bottom surface of the middle shaft rod (22). The clamping positioning block (35) is symmetrically arranged and fixedly connected to the outer surfaces on both sides of the wedge block (34). The supporting spring (36) is sleeved on the outside of the bottom end of the wedge block (34).

3. The double butterfly valve for a wet-type concrete sprayer according to claim 1, wherein: The butterfly plate (41) is fixedly installed on the outer surface of the middle shaft rod (22) by a bolt, the outer surface of the side away from the middle shaft rod (22) of the butterfly plate (41) is fixedly installed with a pressing plate (42) by a bolt, the inner wall of the side surface of the valve body (11) is detachably fixedly installed with a sealing ring (43), and the pressing plate (42) is attached to the sealing ring (43).

4. The double butterfly valve for a wet-type concrete sprayer according to claim 1, wherein: A threaded groove is formed in the middle of the bottom end of the upper shaft rod (21), the upper shaft rod (21) is threadedly connected with the threaded connecting rod (24) through the threaded groove, a center hole is formed in the center of the bottom end of the upper shaft rod (21), the center hole is composed of a circular table groove and a circular cylinder groove, a disc is fixedly connected to the outer surface of the middle shaft rod (22), and the surface of the disc is attached to the upper end groove wall of the circular table groove.

5. A double butterfly valve for a wet-type concrete sprayer according to claim 4, wherein: The clamping block (25) is arranged in the circular cylinder groove, the opposite sides of the two clamping blocks (25) form a volume cavity, the clamping rod (23) is clamped and installed between the two clamping blocks (25), the outer surfaces of the two clamping blocks (25) extend to the inside of the volume cavity, and the two ends of the limiting spring (26) abut against the top surface of the middle shaft rod (22) and the bottom surface of the disc, respectively.

6. A double butterfly valve for a wet-type concrete sprayer according to claim 2, wherein: The valve body (11) and the upper surface of the lower pressing cover (14) form a clamping cavity, the lower shaft rod (31), the limiting block (32), the limiting ring (33), the wedge block (34), the clamping positioning block (35) and the supporting spring (36) are arranged in the clamping cavity, and the middle shaft rod (22) is inserted and installed at the center of the upper surface of the lower shaft rod (31) through the wedge block (34).

7. The double butterfly valve for a wet-type concrete sprayer according to claim 2, wherein: The two limiting blocks (32) are symmetrically arranged, and the accommodating cavities are formed in the two limiting blocks (32), the limiting ring (33), the wedge block (34) and the clamping positioning block (35) are rotationally connected in the accommodating cavities, the two sides of the side surface of the two limiting blocks (32) that are close to each other form a lifting groove, and the size of the lifting groove is matched with the clamping positioning block (35).

8. The double butterfly valve for a wet-type concrete sprayer according to claim 2, wherein: The clamping positioning block (35) is fixedly connected with the protruding block, the inner ring surface of the two limiting rings (33) is fixedly connected with the abutting blocks, the abutting blocks on the two limiting rings (33) are centrally symmetrically arranged, and the protruding blocks on the two clamping positioning blocks (35) respectively abut against the two abutting blocks.

9. The double butterfly valve for a wet-type concrete sprayer according to claim 2, wherein: The bottom end of the supporting spring (36) abuts against the upper surface of the lower shaft rod (31).

10. The double butterfly valve for a wet-type concrete sprayer according to claim 2, wherein: The upper shaft rod (21), the middle shaft rod (22) and the lower shaft rod (31) are in sealed rotary connection with the inside of the valve body (11).

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