A rolling gate valve

Abstract

The present invention discloses a rolling gate valve, including a housing, a gate plate, and a lifting mechanism. A left-right moving mechanism is also installed on the right side of the gate plate. The left-right moving mechanism is mainly composed of a moving cylinder sleeve front plate and a moving cylinder sleeve assembly. The moving cylinder sleeve front plate is installed with two pairs of upper and lower rollers, and the rollers are equipped with guide rails. The moving cylinder sleeve assembly is mainly composed of a moving oil cylinder, a moving piston rod, a moving piston, and a moving oil cylinder control oil circuit. The moving oil cylinder is installed on the right side of the moving cylinder sleeve front plate. The left end of the moving piston rod is fixed to the gate plate, and the right end is placed in the moving oil cylinder and a moving piston is installed on its outer cylindrical surface. The moving piston divides the inner cavity of the moving oil cylinder into two left and right oil chambers. The two oil chambers are connected to the main oil circuit of the gate valve through the moving oil cylinder control oil circuit. The seal of the present invention has less wear, greatly reduces the power of the starting device, reduces mechanical wear, and prolongs the service life of the gate valve.

Description

Technical Field

[0001] The invention relates to equipment in the hydropower, water conservancy and petrochemical industries, in particular to a rolling gate valve used in the hydropower, water conservancy and petrochemical industries. Background Art

[0002] The existing gates and stop valves are commonly used equipment in the hydropower, water conservancy and petrochemical industries. They are installed on the water or oil circulation pipelines. They are mainly composed of a hollow inverted T-shaped shell that can be connected to the pipeline through flanges at both ends, a gate installed in the shell and with a water-stop material installed on one side panel (water-stop surface), and a lifting mechanism installed above the gate for lifting or lowering the gate. Water-stop walls matching the water-stop material are provided on the surrounding walls of the inner cavity pipe mouth of the shell. When the pipeline is in a closed state, the gate is at the bottom, and the water-stop material installed on the gate water-stop surface is tightly sealed and fitted with the water-stop wall installed on the surrounding walls of the pipe mouth, so that water or oil cannot flow through the inner cavity of the shell; when the pipeline needs to be opened, the gate is lifted up by the lifting mechanism, so that the gate moves upward away from the inner cavity pipe mouth, and the inner cavity pipe mouth is opened, so that the water or oil circulation pipeline connected thereto is opened. When the pipeline needs to be closed again, the gate can be lowered.

[0003] However, with the pursuit of automation and high economic benefits, all walks of life have put forward higher requirements for the durability, safety, reliability and easy maintenance of equipment. For the above-mentioned gate valves used in existing hydropower, water conservancy and petrochemical industries, since the water-stop material on the gate plate and the water-stop wall on the inner wall of the shell adopt sliding opening and closing (when the gate moves upward to open or downward to close, the water-stop material will slide up or down against the water-stop wall under the pressure of the upstream water or oil), the sliding water-stop method is adopted, so the friction resistance between the water-stop material and the water-stop wall is very large in the initial opening of the gate and the later closing of the water-stop, causing serious wear and tear of the mechanical part and the water-stop material when closing the water-stop, which is very easy to be damaged, increasing the maintenance workload and seriously affecting production. At the same time, due to the large initial force when starting and the force when closing the water-stop, a large-power opening and closing device is required, thereby increasing the backup power supply capacity in the event of a fault, greatly increasing the investment, and, due to the use of sliding friction, manual operation of opening and closing is laborious and time-consuming, seriously affecting production safety, and the flow of the stop valve is easily blocked. Summary of the invention

[0004] The present invention provides a rolling gate valve for hydropower, water conservancy and petrochemical industry to solve the shortcomings and deficiencies existing in the above-mentioned background technology.

[0005] The technical problem solved by the present invention is achieved by adopting the following technical solutions:

[0006] A rolling gate valve comprises a hollow shell with flanges at both ends, a gate plate installed in the shell, and a lifting mechanism installed above the gate plate for lifting the gate plate, the gate plate water stop surface (i.e., the left side of the gate plate) is installed with water stop material around, the side walls around the inner cavity pipe opening of the shell are provided with water stop walls matching the water stop material, the lifting mechanism is installed in an upper shell connected to the shell through a flange, and is characterized in that: a left-right moving mechanism is also installed on the right side of the gate plate, the left-right moving mechanism is mainly composed of a vertically installed moving cylinder sleeve front plate and a moving cylinder sleeve assembly installed horizontally on the right side of the moving cylinder sleeve front plate; upper and lower pairs of rollers (each pair of rollers is divided into left and right rollers) are symmetrically installed at the upper and lower ends of the moving cylinder sleeve front plate, and the upper and lower pairs of rollers are matched with left and right guide rails installed on the inner cavity wall of the shell; the moving cylinder sleeve assembly The components are mainly composed of a mobile oil cylinder, a mobile piston rod, a mobile piston, and a mobile oil cylinder control oil circuit assembly. The mobile oil cylinder seal is horizontally installed in the middle of the right side of the front plate of the mobile cylinder sleeve. The left end of the mobile piston rod is piston-like through the sealing mounting hole on the front plate of the mobile cylinder sleeve and is fixedly connected to the right side of the gate plate. The right end of the mobile piston rod is placed in the mobile oil cylinder, and the mobile piston installed on its outer cylindrical surface can perform left and right piston-like movements in the mobile oil cylinder. The mobile piston divides the internal cavity of the mobile oil cylinder into two left and right independent and sealed left and right oil chambers. The left and right oil chambers are respectively connected to the main oil circuit of the gate valve through the mobile oil cylinder control oil circuit; the lifting mechanism is a hydraulic cylinder lifting mechanism, which is mainly composed of a lifting cylinder and a lifting piston rod installed from top to bottom, and a matching lifting cylinder control oil circuit. The bottom end of the lifting piston rod is connected to the mobile oil cylinder.

[0007] For the present invention, the upper and lower pairs of rollers, the left and right rollers of each pair of rollers are connected by a roller shaft that is laterally installed and fixed on the front plate of the moving cylinder sleeve, or two mounting holes are opened on the left and right sides of the front plate of the moving cylinder sleeve, and the left and right rollers are separately installed in the mounting holes, or they are symmetrically installed on the left and right sides of the moving cylinder through a mounting base.

[0008] For the present invention, the movable piston is a movable piston: the movable piston rod is a structure with a large diameter at the left end and a small diameter at the right end, the connection between the large diameter part at the left end (a part of which extends into the movable oil cylinder) and the small diameter part at the right end is a step, and the outer cylindrical surface of the small diameter part at the right end is threaded and equipped with a piston locking nut, and the piston is clamped and locked between the locking nut and the step. In order to ensure the sealing of the left and right oil chambers separated by the piston, the inner and outer cylindrical surfaces of the piston are both provided with circumferential grooves and inlaid with sealing rubber rings, the outer cylindrical surface of the piston is in sealing contact with the inner cylindrical surface of the movable oil cylinder, and the inner cylindrical surface of the piston is sealingly sleeved on the outer cylindrical surface of the movable piston rod.

[0009] For the present invention, the mobile oil cylinder is composed of a cylindrical body and a mobile cylinder sleeve rear plate installed on the right end of the body by bolt sealing. The left end of the mobile oil cylinder body is sealed and fixed to the right side of the mobile cylinder sleeve front plate by welding or the like. The mobile cylinder sleeve rear plate covers the right end opening of the mobile oil cylinder. A sealing rubber ring is installed at the joint between the mobile cylinder sleeve rear plate and the right end of the mobile oil cylinder. A plurality of bolt holes are evenly opened on the edge of the mobile cylinder sleeve rear plate. A plurality of bolt fixing seats with bolt holes are also provided on the outer circumferential surface of the right end of the mobile oil cylinder. After the bolts are inserted into the two bolt holes and tightened, the mobile cylinder sleeve rear plate is sealed and installed on the right end of the mobile oil cylinder. A mobile piston rod mounting hole is also opened in the middle part of the mobile cylinder sleeve rear plate. The outer side surface of the mounting hole is installed with a cylinder sleeve rear cover. The right end of the mobile piston rod is piston-type installed in the mounting hole.

[0010] According to the present invention, the movable oil cylinder, the movable piston rod, the movable piston, and the two movable piston rod mounting holes on the movable cylinder sleeve front plate and the movable cylinder sleeve rear plate are mounted coaxially (central axis).

[0011] In the present invention, the two left and right guide rails on which the two pairs of upper and lower rollers are matched and mounted on the inner wall of the shell are grooved rails made of stainless steel.

[0012] For the present invention, the lifting cylinder of the lifting mechanism is fixedly installed above the upper outer shell through a support frame. After the lifting piston rod passes through the top wall of the upper outer shell, its bottom end is connected to the moving cylinder. The lifting cylinder control oil circuit of the lifting mechanism is connected to the main oil circuit of the gate valve.

[0013] For the present invention, a lifting ring is installed on the top of the outer wall of the movable oil cylinder, a lifting hole is opened at the bottom end of the lifting piston rod, the lifting ring and the lifting hole are equipped with a pin shaft, and the pin shaft is inserted into the lifting hole and the lifting ring to realize the movable connection between the movable oil cylinder and the lifting piston rod.

[0014] The working principle of this rolling gate valve:

[0015] When the gate needs to be opened (moved upward) or closed (moved downward), the left and right moving mechanism installed on the gate is used to move the piston rod left and right (extend and retract) to separate the gate water-stop material from the water-stop wall, and then the lifting mechanism is used to move the gate upward or downward to open or close. In the process of the gate moving upward or downward, the water-stop material is separated from the water-stop wall, and only the roller bears the pressure of the liquid medium, so that the sliding friction between the water-stop material and the water-stop wall is changed into the rolling friction between the roller and the guide rail during the opening or closing process of the gate, so that the friction resistance is very small, the starting force during opening and closing is reduced, the mechanical wear is greatly reduced, and the service life of the gate valve is increased.

[0016] Beneficial effects: 1. The present invention adopts a rolling telescopic gate structure, so that before the gate is opened and closed, the gate adopts a telescopic structure, inheriting the advantage of no sliding friction loss on the sealing surface of the stop valve. Under the action of oil pressure, the gate moves in the opposite direction of the water flow (to the right) away from the gate valve seat, so that there is no sliding friction between the water-stop material and the water-stop part of the valve seat. Therefore, there is no friction loss in the sealing device, making the seal durable; 2. When the gate mechanism is opened to the closed position, the gate moves in the direction of the water flow (to the left) under the action of oil pressure to close the water stop. Since the water stop adopts O-type rubber material, the water stop method has a water stopping effect Good, easy to replace and maintain, and the gate can be reused, reducing production costs, improving economic benefits, and can quickly cut off the flow of media, which is particularly practical for hydropower stations. Ideal second set of safety protection equipment; 3. When the gate mechanism opens upward or closes downward, the gate leaves the valve seat under the action of oil pressure, and the sealing device on the gate leaves the valve seat. Since the four wheels of the entire gate structure are close to the valve seat guide rail, the wheels roll up or down on the guide rail. Since the rolling friction resistance is very small, it greatly reduces the power of the starting device, reduces mechanical wear, and greatly extends the service life of the gate valve. The up and down movement of the gate retains the advantages of the original gate valve, so the gate valve has the advantages of smooth flow of media without resistance, which is the advantage desired by the hydropower station. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a front cross-sectional view of the present invention;

[0018] Figure 2 It is the AA cross-sectional view of the present invention;

[0019] Figure 3 It is the right side view of the present invention.

[0020] In the figure: 1-flange, 2-housing, 3-gate, 4-waterstop material, 5-pipe mouth, 6-waterstop wall, 7-upper housing, 8-movable cylinder liner front plate, 9-roller, 10-guide rail, 11-movable cylinder, 12-movable piston rod, 13-movable piston, 14-left oil chamber, 15-right oil chamber, 16-movable cylinder control oil circuit, 17-lifting cylinder, 18-lifting piston rod, 19-lifting cylinder control oil circuit, 20-roller shaft, 21-ladder, 22-sealing rubber ring, 23-locking nut, 24-bolt, 25-movable cylinder liner rear plate, 26-cylinder liner rear cover, 27-support frame, 28-lifting ring, 29-pin shaft, 30-extension rod. DETAILED DESCRIPTION

[0021] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings:

[0022] See attached Figure 1-2As shown, a rolling gate valve comprises a hollow shell 2 with flanges 1 at both ends of the pipe openings, a gate plate 3 installed in the shell, and a lifting mechanism installed above the gate plate for lifting the gate plate, the gate plate water stop surface (i.e., the left side of the gate plate) is installed with water stop material 4 around, the side walls around the inner cavity pipe opening 5 of the shell are provided with water stop walls 6 matching the water stop material, the lifting mechanism is installed in an upper shell 7 connected to the shell through a flange, and a left-right moving mechanism is also installed on the right side of the gate plate, the left-right moving mechanism is mainly composed of a vertically installed moving cylinder sleeve front plate 8 and a moving cylinder sleeve assembly installed horizontally on the right side of the moving cylinder sleeve front plate; upper and lower pairs of rollers 9 (each pair of rollers is divided into left and right rollers) are symmetrically installed at the upper and lower ends of the moving cylinder sleeve front plate, and the upper and lower pairs of rollers are matched with left and right guide rails 10 installed on the inner cavity wall of the shell; the moving cylinder sleeve assembly is mainly composed of a moving oil cylinder 11, a moving piston rod 12, a moving piston 13, and a moving oil cylinder control The oil circuit assembly structure is that the movable oil cylinder seal is transversely installed in the middle of the right side surface of the movable cylinder sleeve front plate, the left end of the movable piston rod piston-like passes through (that is, the left end of the movable piston rod can perform left and right piston-like reciprocating motion in the mounting hole) the sealing mounting hole on the movable cylinder sleeve front plate and is fixedly connected to the right side surface of the gate plate, the right end of the movable piston rod is placed in the movable oil cylinder, and the movable piston installed on its outer cylindrical surface can perform left and right piston-like motion in the movable oil cylinder, the movable piston divides the internal cavity of the movable oil cylinder into two left and right independent and sealed left and right oil chambers (as shown in the left oil chamber 14 and the right oil chamber 15 in the attached figure), and the left and right oil chambers are respectively connected to the gate valve main oil circuit (not shown in the attached figure) through the movable oil cylinder control oil circuit 16; the lifting mechanism is a hydraulic oil cylinder lifting mechanism, which is mainly composed of a lifting cylinder 17 and a lifting piston rod 18 installed from top to bottom, and a matching lifting cylinder control oil circuit 19, and the bottom end of the lifting piston rod is connected to the movable oil cylinder.

[0023] In specific implementation:

[0024] 1. Two pairs of rollers are symmetrically installed at the upper and lower ends of the front plate of the moving cylinder sleeve. The left and right rollers of each pair of rollers are connected by a roller shaft 20 which is transversely installed and fixed on one side of the front plate of the moving cylinder sleeve (this installation method is shown in the attached Figure 3 As shown, it can be fixed on the side of the front plate of the movable cylinder sleeve by two left and right shaft sleeves), and rotate synchronously, or two mounting holes are opened on the left and right sides of the front plate of the movable cylinder sleeve, and the left and right rollers are separately installed in the mounting holes (this installation method is shown in the attached Figure 1 , 2 As shown in the figure): It is also installed by roller shaft, the roller is installed on the roller shaft, and the two ends of the roller shaft are fixed on the front and rear plates of the moving cylinder sleeve on the left and right sides of the installation hole. When the gate moves up or down, the upper and lower rollers on the same side of the front and rear plates of the moving cylinder sleeve roll on the guide rail on the same side. Figure 1 , 2 The roller installation shown is similar to the Figure 3 Compared with the roller installation method shown in , the two use the same guide rails. At the same time, when the former roller installation method is used, the two side edges of the front plate of the moving cylinder sleeve will be properly inserted into the guide rail grooves, while when the latter roller installation method is used, the two side edges of the front plate of the moving cylinder sleeve do not need to be inserted into the guide rail grooves. In addition to the above two roller installation methods, at the same time, the upper and lower pairs of rollers can also be fixed and symmetrically installed on the left and right sides of the moving cylinder through the installation base: first, two installation bases are symmetrically installed on the left and right sides of the moving cylinder, and a vertical installation plate is installed on the outward end of each base, and the upper and lower rollers are respectively installed on the upper and lower ends of the vertical installation plate. The upper and lower rollers are also symmetrically installed on the vertical installation plate of the other side base, forming the upper and lower symmetry and left and right symmetry of the rollers. At this time, the left and right guide rails matching the rollers are correspondingly installed on the inner wall of the outer shell on the side of the moving cylinder.

[0025] 2. The movable piston is a movable piston: the movable piston rod has a structure with a large diameter at the left end and a small diameter at the right end. The connection between the large diameter part at the left end (a part of which extends into the movable oil cylinder) and the small diameter part at the right end is a step 21, and the outer cylindrical surface of the small diameter part at the right end is threaded and equipped with a piston locking nut 23. The piston is clamped and locked between the locking nut and the step. In order to ensure the sealing of the left and right oil chambers separated by the piston, the inner and outer cylindrical surfaces of the piston are provided with circumferential grooves and a sealing rubber ring 22 is embedded and installed (a circumferential groove can be opened on the inner and outer cylindrical surfaces of the piston, and the sealing rubber ring is embedded and installed in the groove, and the sealing rubber ring plays a sealing role; Note: All the sealing rubber rings in the attached drawings are marked with 22), the outer cylindrical surface of the piston is in sealing contact with the inner cylindrical surface of the movable oil cylinder, and the inner cylindrical surface of the piston is sealingly sleeved on the outer cylindrical surface of the movable piston rod. The thread of the small diameter part at the right end of the moving piston rod extends to the left from the right end of the moving piston rod and extends to the right appropriate position of the sealing rubber ring on the inner surface of the piston after the piston is locked. That is to say, after the piston is locked, there should be no thread at the sealing rubber ring position on the inner surface. When installing the piston, first sleeve the piston onto the moving piston rod and push it to the left to the step position where the large diameter part and the small diameter part are connected, then screw in the locking nut from the right end of the moving piston rod until the piston is clamped and fixed between the step and the locking nut, and the piston is completely fixed.

[0026] 3. The mobile oil cylinder is assembled by a cylindrical body and a mobile cylinder sleeve rear plate 25 which is sealed and installed at the right end of the body by bolts 24: the left end of the mobile oil cylinder body is sealed and fixedly connected to the right side of the mobile cylinder sleeve front plate by welding or other means (the sealing of the welding point must be ensured, and it is important not to have defects such as welding pores), the mobile cylinder sleeve rear plate covers the right end opening of the mobile oil cylinder, and the outward (right) end of the mobile cylinder sleeve rear plate is designed and installed with a reinforcing rib (or a reinforcing plate, not shown in the figure) to prevent the mobile cylinder sleeve rear plate from being deformed by the oil high pressure when the right oil chamber is filled with oil; the edge of the mobile cylinder sleeve rear plate is evenly opened with a plurality of bolt holes, and the outer circumferential surface of the right end of the mobile oil cylinder is There are multiple bolt fixing seats with bolt holes. After the bolts 24 are inserted into the two bolt holes and tightened with nuts, the rear plate of the mobile cylinder sleeve is sealed and installed on the right end of the mobile oil cylinder, or a threaded hole is directly opened on the right end face of the mobile oil cylinder wall, and the bolts are passed through the bolt holes of the rear plate of the mobile cylinder sleeve and screwed into the threaded hole to fix the rear plate of the mobile cylinder sleeve; a mobile piston rod mounting hole is also opened in the middle part of the rear plate of the mobile cylinder sleeve, and the outer side of the mounting hole is sealed and installed with a cylinder sleeve rear cover 26, and the right end of the mobile piston rod is piston-mounted (that is, the right end of the mobile piston rod can perform piston-like reciprocating motion back and forth in the mounting hole) in the mounting hole. The design of the mobile cylinder sleeve rear plate is convenient for disassembly and maintenance of various components in the mobile oil cylinder.

[0027] 4. During production, the mobile oil cylinder, mobile piston rod, mobile piston, and the two mobile piston rod mounting holes on the front plate of the mobile cylinder sleeve and the rear plate of the mobile cylinder sleeve are installed coaxially (central axis), and their coaxiality must be ensured to avoid "stuck" phenomenon of various components due to different axes during operation.

[0028] 5. The two pairs of upper and lower rollers are matched. The left and right guide rails installed on the inner wall of the shell are made of stainless steel grooved rails (i.e. stainless steel channel steel), which match the positions of the left and right rollers. The length of the guide rail should be greater than the length of the roller rolling up and down, so as to ensure that the roller can roll on the guide rail without running out of the outer skin of the guide rail when the gate moves up and down. In order to prevent the roller from running off when rolling up and down, the upper and lower rollers on the same side are placed in the groove of the same channel steel. The two side plates of the channel steel can correct the deviation of the roller, effectively ensuring the verticality of the roller when rolling up and down, thereby ensuring the verticality of the gate's up and down movement, and achieving the effect of precise positioning and movement.

[0029] 6. The lifting cylinder of the lifting mechanism is fixedly installed on the upper shell through the support frame 27. After the lifting piston rod passes through the top wall of the upper shell, its bottom end is connected to the mobile cylinder (a sealing device such as a sealing rubber ring is installed at the connection between the lifting piston rod and the top wall of the upper shell). The lifting cylinder control oil circuit of the lifting mechanism is connected to the main oil circuit of the gate valve. The lifting mechanism can be installed vertically with an ordinary hydraulic cylinder. When the piston rod of the ordinary hydraulic cylinder is not long enough to be connected to the mobile cylinder, an extension rod can be installed at the bottom of the piston rod.

[0030] 7. A lifting ring 28 is installed on the top of the outer wall of the mobile oil cylinder. The lifting ring is formed by two hanging plates with holes installed vertically and in parallel. A gap is left between the two hanging plates to insert the lifting piston rod, and a lifting hole is opened at the bottom end of the lifting piston rod. During installation, insert the bottom end of the lifting piston rod into the gap of the lifting ring, so that the lifting hole on the lifting piston rod corresponds to the hole on the two hanging plates of the lifting ring, and then insert the matching pin 29 to achieve a movable connection between the mobile oil cylinder and the lifting piston rod. In specific implementation, the left side can directly use the front plate of the movable cylinder sleeve as a hanging plate. At the same time, only one hanging plate with holes can be used to connect with the lifting piston rod. However, it must be noted during production that the lifting ring should be installed on the vertical line of the center of gravity of the lifting mechanism.

[0031] 8. To achieve the effect of intelligent operation, a fully closed position sensor is installed on the periphery of the water stop wall. The fully closed position sensor is connected to the control switch of the mobile oil cylinder control oil circuit. When the sensor senses that the water stop material of the gate plate is tightly attached to the water stop wall, the control switch of the mobile oil cylinder control oil circuit is controlled to be closed, and the left and right moving mechanism no longer moves to the left, that is, the gate plate no longer moves to the left, effectively preventing the left and right moving mechanism from excessively moving to the left and causing the gate plate to crush the water stop material. The fully closed position sensor can use an ordinary electronic sensor. In order to save costs, a mechanical sensor can also be used: a mechanical switch that can be elastically extended and retracted to the left and right is used. When the gate plate is properly close to the water stop material, the elastic part of the mechanical switch is compressed, the circuit of the sensor is connected and the control switch of the mobile oil cylinder control oil circuit is closed. When the gate plate leaves the water stop material, the elastic part of the mechanical switch pops out, the circuit of the mechanical switch is disconnected, and the control switch of the mobile oil cylinder control oil circuit is no longer controlled. At the same time, the gate valve is also equipped with limit switches (upper limit position sensor and lower limit position sensor) for the gate's upward and downward movement. The limit switch can be an ordinary electronic induction switch or a mechanical limit device installed in the guide groove, such as a baffle. When the gate moves upward or downward to the limit position, the electronic induction switch senses the position and disconnects the lifting mechanism circuit, or the baffle blocks the roller from continuing to roll upward or downward.

[0032] 9. Regarding the mobile oil cylinder control oil circuit and the lifting oil cylinder control oil circuit: The left oil chamber and the right oil chamber of the mobile oil cylinder are respectively equipped with two oil circuit interfaces, and the mobile oil cylinder control oil circuit connects the oil circuit interfaces to communicate with the left and right oil chambers. In order to facilitate the piping of the mobile oil cylinder control oil circuit, as shown in the attached figure, a hollow extension rod 30 can be installed at the lower end of the lifting piston rod, the top of the extension rod is connected to the lifting piston rod through a flange or the like, the bottom of the extension rod is connected to the lifting ring, the extension rod passes through the top wall of the upper shell and is piston-connected to the connection with the upper shell. At the same time, two pipeline holes are opened at the bottom and top of the extension rod respectively, and the two left and right oil chamber control oil circuits of the mobile oil cylinder pass through the pipeline hole at the bottom of the extension rod into the hollow cavity of the extension rod, and then pass through the two pipeline holes at the top of the extension rod to connect with the main oil circuit of the gate valve.

[0033] For the lifting cylinder, a piston is installed inside it, and the internal cavity of the lifting cylinder is divided into two upper and lower oil chambers by the piston. The upper and lower oil chambers are connected to the main oil circuit of the gate valve through two lifting cylinder control oil circuits respectively. The rise and fall of the lifting piston rod are actually achieved by controlling the oil inlet and outlet of the upper and lower oil chambers.

[0034] 10. About the main oil circuit of the gate valve: The main oil circuit of the gate valve adopts an ordinary multi-way CNC oil valve and its control switch. One end of the valve is separately connected to the lifting cylinder control oil circuit and the mobile cylinder control oil circuit, and the other end is connected to the control switch through a circuit, which can control the oil inlet and oil outlet of the lifting cylinder, the oil inlet and oil outlet of the left oil chamber of the mobile cylinder, and the oil inlet and oil outlet of the right oil chamber of the mobile cylinder respectively. At the same time, the oil inlet and oil outlet of the lifting cylinder, and the oil inlet and oil outlet of the left and right oil chambers of the mobile cylinder are linked to each other, that is, when one cylinder is filled with oil, the other matching cylinder will discharge oil synchronously. The control is as follows: when the gate valve is operated from fully open to fully closed, the fully closed total oil supply CNC oil valve is opened, the left oil chamber of the moving oil cylinder enters oil, and the right oil chamber discharges oil. After a certain period of time (the gate leaves the water stop wall and remains in the position of leaving the water stop wall), the upper oil chamber of the lifting oil cylinder enters oil, and the lower oil chamber discharges oil, so that the gate valve moves downward to the fully closed height. Then, under the control of the fully closed CNC oil valve, the right oil chamber of the moving oil cylinder enters oil, and the left oil chamber discharges oil, so that the gate moves to the left under the action of the pressure oil in the oil cylinder to fully close the gate valve. When the gate valve is operated from fully closed to fully open, the fully opened total oil supply CNC oil valve is opened, the left oil chamber of the moving oil cylinder enters oil, and the right oil chamber discharges oil. After a certain period of time, the gate leaves the water stop wall or remains in the leaving position, the lower oil chamber of the lifting oil cylinder enters oil, and the upper oil chamber discharges oil, so that the gate valve moves upward to the fully open height.

[0035] The working principle and process of this rolling gate valve:

[0036] 1. The gate valve changes from closed to open: When the gate valve is in the closed state of blocking the pipeline, the gate is at the lowest and leftmost extreme position. At this time, the water-stopping material on the left side of the gate is close to the water-stopping wall, and the pipe opening on the left side of the gate is blocked by the gate. The water on the right side of the gate cannot flow into the left pipe opening. When the gate needs to be opened, it is necessary to lift the gate upward to open the closed pipe opening on the left. At this time, first start the mobile cylinder control oil circuit through the gate valve main oil circuit (open the left oil chamber oil inlet switch of the mobile cylinder), so that the left oil chamber of the left and right moving mechanism is filled with oil, and the right oil chamber is linked to discharge oil. Under the action of the high-pressure oil in the left oil chamber, the mobile piston moves horizontally to the right and drives the mobile piston rod to move horizontally to the right, and at the same time drives the gate fixedly installed on the left end of the mobile piston rod to move horizontally to the right. After the gate moves a certain distance to the right, the fully closed position sensor sends a stop message and controls the closing of the left oil chamber oil inlet switch of the mobile cylinder control oil circuit (in this process, the lifting piston rod and the lifting cylinder are in the up and down and left and right positions). The position will not change), at this time, the gate stops moving to the right, and the water-stop material close to the water-stop wall leaves the water-stop wall and forms a certain distance between the water-stop material and the water-stop wall; then, the lifting mechanism control oil circuit is started through the gate valve main oil circuit (the lifting cylinder oil outlet switch is turned on), the lifting cylinder discharges oil, and at the same time drives the lifting piston rod to move upward, thereby driving the gate upward through the lifting ring. When the gate moves upward to a certain height, the gate completely leaves the left pipe mouth position upward, the left pipe mouth is fully opened, the gate valve is in an open state, the upper limit position sensor sends a stop signal, and then the lifting mechanism control oil circuit is closed through the gate valve main oil circuit. During the upward movement of the gate plate, since the water-stop material has left the water-stop wall, the gate plate is lifted upward only by the rolling of the roller on the guide rail, and the sliding friction between the water-stop material and the water-stop wall is changed to the rolling friction between the roller and the guide rail, thereby greatly reducing the lifting power of the lifting mechanism (in the lifting process of the existing gate plate, the water-stop material slides on the water-stop wall, and due to the pressure of the water body on the right side, the friction coefficient between the water-stop material and the water-stop wall is very large, and the gate plate itself has its own weight, resulting in the lifting mechanism to lift the gate plate requires a great lifting power, while the adoption of this technology, the friction coefficient between the roller and the guide rail At the same time, because the sliding friction between the original water-stop material and the water-stop wall is changed to the rolling friction between the roller and the guide rail, the wear of the water-stop material when sliding between the water-stop material and the water-stop wall during the rising or falling of the gate plate is completely prevented (in the process of rising or falling of the existing gate plate, the friction coefficient between the water-stop material and the water-stop wall is very large, which causes the water-stop material to wear very quickly, which can easily cause poor water-stopping effect and even cause major safety accidents), which greatly improves the service life of the gate plate and its water-stop material.

[0037] 2. The gate valve changes from open to closed state: When the gate valve needs to be closed, the lifting mechanism control oil circuit is first opened in reverse through the gate valve main oil circuit, and the lifting cylinder is filled with oil to push the lifting piston rod to move slowly downward. At the same time, the gate moves downward. When the gate moves downward to the lowest position, the lower limit position sensor sends a stop signal, and the lifting mechanism control oil circuit is closed through the gate valve main oil circuit. The gate no longer moves downward and is located to the right of the left pipe opening and a certain distance from the left pipe opening. During the process of the gate descending, the water-stop material leaves the water-stop wall, and the sliding friction between the original water-stop material and the water-stop wall has changed to the rolling friction between the roller and the guide rail. This completely prevents the wear of the water-stop material during the descent process; subsequently, the mobile cylinder control oil circuit is opened in reverse through the main oil circuit of the gate valve (i.e., the oil inlet switch of the right oil chamber of the mobile cylinder is opened), so that oil enters the right oil chamber of the left and flows out of the left oil chamber of the left and right moving mechanisms. Under the action of the high-pressure oil in the right oil chamber, the mobile piston translates to the left and drives the mobile piston rod to translate to the left, and at the same time drives the gate plate fixed at the left end of the mobile piston rod to translate to the left. After the gate plate moves a certain distance to the left, the fully closed position sensor closes the mobile cylinder control oil circuit. At this time, the gate plate moves to the leftmost extreme position, the water-stop material is tightly attached to the water-stop wall to form a sealing state, and the gate valve is closed.

[0038] 3. The gate valve is in a semi-open and semi-closed state: When the gate valve needs to be in a semi-open and semi-closed state, if the gate valve is originally in a fully open state, you only need to lower the gate plate appropriately so that the gate plate at the pipe mouth blocks half of the pipe mouth and then close the lifting mechanism to control the oil circuit; if the gate valve is originally in a fully closed state, you only need to move the gate plate to the right first, and then lift the gate plate upward to half the height of the pipe mouth and then close all oil circuits.

[0039] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the protection required. The scope of protection required by the present invention is defined by the attached claims and their equivalents.

Claims

1. A rolling gate valve, comprising a hollow shell with flanges at both ends, a gate installed in the shell, and a lifting mechanism installed above the gate for lifting the gate, a water-stop material is installed around the water-stop surface of the gate, and a water-stop wall matching the water-stop material is arranged on the side walls around the inner cavity of the shell. The lifting mechanism is installed in an upper shell connected to the shell through a flange, characterized in that: A left-right moving mechanism is also installed on the right side of the gate plate, and the left-right moving mechanism is mainly composed of a vertically installed moving cylinder sleeve front plate and a moving cylinder sleeve assembly installed horizontally on the right side of the moving cylinder sleeve front plate; two pairs of upper and lower rollers are symmetrically installed at the upper and lower ends of the moving cylinder sleeve front plate, and the upper and lower pairs of rollers are equipped with left and right guide rails installed on the inner wall of the shell; the moving cylinder sleeve assembly is mainly composed of a moving oil cylinder, a moving piston rod, a moving piston, and a moving oil cylinder control oil circuit assembly, the moving oil cylinder seal is installed horizontally in the middle of the right side of the moving cylinder sleeve front plate, and the left end of the moving piston rod is piston-type and fixedly connected to the right side of the gate plate after passing through the sealing mounting hole on the moving cylinder sleeve front plate, the The right end of the moving piston rod is placed in the moving cylinder, and the moving piston installed on its outer cylindrical surface can make left and right piston-like movements in the moving cylinder. The moving piston divides the internal cavity of the moving cylinder into two independent and sealed left and right oil chambers. The left and right oil chambers are respectively connected to the main oil circuit of the gate valve through the moving cylinder control oil circuit; the lifting mechanism is a hydraulic cylinder lifting mechanism, which is mainly composed of a lifting cylinder and a lifting piston rod installed in sequence from top to bottom, and a matching lifting cylinder control oil circuit. The bottom end of the lifting piston rod is connected to the moving cylinder; the upper and lower pairs of rollers, the left and right rollers of each pair of rollers are connected by a roller shaft installed horizontally and fixed on the front plate of the moving cylinder sleeve, or on the front plate of the moving cylinder sleeve Two mounting holes are opened on the left and right sides of the movable cylinder, and the left and right rollers are respectively installed in the mounting holes separately, or are fixed and symmetrically installed on the left and right sides of the movable cylinder through a mounting base; the movable piston is a movable piston: the movable piston rod is a structure with a large diameter at the left end and a small diameter at the right end, the connection between the large diameter part at the left end and the small diameter part at the right end is a step, and the outer cylindrical surface of the small diameter part at the right end is threaded and equipped with a piston locking nut, and the piston is clamped and locked between the locking nut and the step; the movable cylinder is assembled by a cylindrical barrel and a movable cylinder sleeve rear plate installed on the right end of the barrel by bolts, the left end of the movable cylinder barrel is sealed and fixedly connected to the right side of the movable cylinder sleeve front plate, and the movable cylinder sleeve rear plate is fixedly connected to the right side of the movable cylinder sleeve front plate. The plate covers the right open end of the mobile cylinder, a sealing rubber ring is installed at the joint between the rear plate of the mobile cylinder sleeve and the right end of the mobile cylinder, and a plurality of bolt holes are evenly opened on the edge of the rear plate of the mobile cylinder sleeve, and a plurality of bolt fixing seats with bolt holes are also provided on the outer circumferential surface of the right end of the mobile cylinder. After the bolts are inserted into the two bolt holes and tightened, the rear plate of the mobile cylinder sleeve is sealed and installed on the right end of the mobile cylinder. A mobile piston rod mounting hole is also opened in the middle part of the rear plate of the mobile cylinder sleeve, and a cylinder sleeve rear cover is installed on the outer side surface of the mounting hole, and the right end of the mobile piston rod is piston-type installed in the mounting hole; the mobile cylinder, mobile piston rod, mobile piston, and the two mobile piston rod mounting holes on the front plate of the mobile cylinder sleeve and the rear plate of the mobile cylinder sleeve are coaxially installed.

2. A rolling gate valve according to claim 1, characterized in that: The two pairs of upper and lower rollers are matched with the left and right guide rails mounted on the inner wall of the shell, and the left and right guide rails are grooved rails made of stainless steel.

3. A rolling gate valve according to claim 1, characterized in that: The lifting cylinder of the lifting mechanism is fixedly installed above the upper shell through a support frame. After the lifting piston rod passes through the top wall of the upper shell, its bottom end is connected to the moving cylinder. The lifting cylinder control oil circuit of the lifting mechanism is connected to the main oil circuit of the gate valve.

4. A rolling gate valve according to claim 1, characterized in that: A lifting ring is installed on the top of the outer wall of the movable oil cylinder, and a lifting hole is opened at the bottom end of the lifting piston rod. The lifting ring and the lifting hole are equipped with a pin shaft. The pin shaft is inserted into the lifting hole and the lifting ring to realize the movable connection between the movable oil cylinder and the lifting piston rod.

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