A bottom-hinged flat gate

Abstract

The utility model relates to valve and fluid control technical field, especially lower open formula flat plate gate, including first gate frame welding spare, gate, sealing strip, upper shaft, lower shaft, upper sliding sleeve, lower sliding sleeve, oil cylinder and connecting part. Gate is driven to realize the opening and closing action by oil cylinder along the upper shaft and lower shaft and make vertical direction sliding through upper sliding sleeve and lower sliding sleeve. Through setting up oil cylinder axle long spacer ring and oil cylinder axle short spacer ring in oil cylinder piston rod end, cooperate the ladder structure between sliding sleeve and axle, make the door plate and sealing strip keep apart in the vast majority of stroke in the opening and closing process, only in the closing last section about 15mm stroke can be in close conjunction seal, open the first section about 15mm after is completely separated, effectively reduced the abrasion between door plate and sealing strip, prolongs the sealing life. The device structure is compact, adopts all 304 stainless steel material, has good corrosion resistance and sealing reliability, is applicable to water treatment, chemical industry and the like.

Description

Technical Field

[0001] This utility model relates to the field of valve and fluid control technology, and in particular to a bottom-opening flat gate. Background Technology

[0002] Existing bottom-opening flat gates are widely used in water supply and drainage, sewage treatment, and chemical pipeline systems. They typically consist of a frame, a gate panel, and a circumferential sealing pair. Opening and closing are achieved through the linear movement of the gate panel in the vertical direction, with shut-off achieved through surface or line contact between the frame's sealing seat and the gate panel's sealing surface. Common guiding mechanisms are often shaft-sleeve or guide rail-slider combinations to ensure the straightness of the gate panel's stroke and the fit at the end. However, traditional structures often design the gate panel to maintain continuous contact with the sealing strip throughout its entire stroke, resulting in friction. This is particularly disadvantageous in media containing solid particles or suspended matter: during opening and closing, the gate panel and sealing strip are constantly in frictional contact, especially in media containing solid particles or suspended matter. The sealing surface is easily scratched and eroded, and the sealing strip undergoes permanent compression deformation, leading to increased opening and closing resistance, shortened seal life, and increased leakage rate. Therefore, designing a bottom-opening flat gate is essential. Utility Model Content

[0003] The purpose of this utility model is to provide a bottom-opening flat gate to solve the problems mentioned in the background art.

[0004] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a bottom-opening flat gate, including a first gate frame welded component, which is a frame-type support structure and has a shaft mounting part; the gate includes a second gate plate welded component, an upper sliding sleeve, and a lower sliding sleeve, the upper sliding sleeve and the lower sliding sleeve being respectively fixedly disposed on the upper part and the lower part of the second gate plate welded component; an upper shaft and a lower shaft are respectively inserted into the upper sliding sleeve and the lower sliding sleeve, forming a guide pair, the two ends of the upper shaft being fixed to the first gate frame welded component by shaft end flanges, and the two ends of the lower shaft being fixed to the first gate frame welded component by lower shaft end plates. The first gate frame welded component; the hydraulic cylinder, the tail of which is hinged to the first gate frame welded component via a hydraulic cylinder tail seat connecting shaft, and the piston rod end is hinged to the second gate plate welded component; the piston rod end is sequentially fitted with a long hydraulic cylinder shaft spacer and a short hydraulic cylinder shaft spacer, which are used to cause the gate to produce a slight horizontal displacement in the direction of the sealing strip when the piston rod approaches the end of its stroke; the sealing strip is installed on the sealing seat surface of the inner cavity of the first gate frame welded component, and the sealing strip is completely disengaged from the gate after the initial opening stroke, and achieves pressing contact during the final closing stroke.

[0005] According to the above technical solution, the upper shaft and the lower shaft are provided with a pushing section and a tapered guiding section on their outer periphery, and the inner holes of the upper sliding sleeve and the lower sliding sleeve have a stepped shoulder structure that matches them, which is used to form a horizontal guiding pressure at the end of the closing section.

[0006] According to the above technical solution, there is a step difference between the long spacer ring and the short spacer ring of the cylinder shaft, which, together with the stepped structure at the piston rod end, forms an opening and closing delay stroke, so that the sealing action only occurs within the stroke range of about 15mm at the end of the closing stage and about 15mm at the beginning of the opening stage.

[0007] According to the above technical solution, the upper sliding sleeve and the lower sliding sleeve are installed on the second gate plate welding part by bolt connection or welding.

[0008] According to the above technical solution, the sealing strip is fixed to the first gate frame welded part by pressure plate screws or dovetail groove structure, and the contact surface between the sealing strip and the gate is a parallel sealing surface structure.

[0009] According to the above technical solution, the first gate frame welded component, gate, guide pair, oil cylinder and its connecting structure are all made of 304 stainless steel.

[0010] Compared with the prior art, the beneficial effects achieved by this utility model are as follows: This utility model, through the setting of a stepped guide shaft and sliding sleeve cooperation structure, a long and short spacer delay mechanism at the end of the piston rod, and a controllable pressure sealing structure, ensures that the gate only contacts the sealing strip during the last 15mm of the closing stroke and completely disengages after the first 15mm of the opening stroke. This significantly reduces wear between the gate plate and the sealing strip, lowers the opening and closing resistance, extends the service life of the sealing strip, and improves the smoothness of gate opening and closing and the reliability of sealing. In addition, the device has a compact structure, stable guidance, and is made of 304 stainless steel, which has excellent corrosion resistance and an ultra-long service life, making it suitable for long-term stable operation under various harsh working conditions. Attached Figure Description

[0011] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a front view of a bottom-opening flat gate proposed in this utility model after the gate plate has been removed; Figure 2 This is a cross-sectional view AA of a bottom-opening flat gate proposed in this utility model; Figure 3 This is a top view of a bottom-opening flat gate proposed in this utility model; Figure 4 This is a schematic diagram of the overall structure of a bottom-opening flat plate proposed in this utility model.

[0012] In the figure: 1 First gate frame welded part, 2 Shaft end flange, 3 Upper shaft, 4 Upper sliding sleeve, 5 Second gate plate welded part, 6 Oil cylinder, 7 Lower shaft end plate, 8 Lower shaft, 9 Lower sliding sleeve, 10 Shaft retaining ring, 11 Oil cylinder shaft long spacer, 12 Oil cylinder shaft short spacer, 13 Oil cylinder tail seat connecting shaft, 14 Sealing strip, 15 Gate. Detailed Implementation

[0013] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0014] Example: Reference Figures 1-4 This embodiment provides a bottom-opening flat gate, which is made of 304 stainless steel and includes a first gate frame welded part 1, a shaft end flange 2, an upper shaft 3, an upper sliding sleeve 4, a second gate plate welded part 5, a hydraulic cylinder 6, a lower shaft end plate 7, a lower shaft 8, a lower sliding sleeve 9, a shaft retaining ring 10, a hydraulic cylinder shaft long spacer 11, a hydraulic cylinder shaft short spacer 12, a hydraulic cylinder tail seat connecting shaft 13, a sealing strip 14, and a gate 15; wherein the gate 15 is formed by the second gate plate welded part 5 as the gate plate body and the upper sliding sleeve 4 and the lower sliding sleeve 9 being fixedly connected, and the gate plate performs linear reciprocating motion in the vertical direction to realize opening and closing. The first gate frame welded component 1 is a rectangular frame-type load-bearing and guide base. An upper shaft 3 and a lower shaft 8 are arranged horizontally on both sides of the frame. The two ends of the upper shaft 3 are locked to the first gate frame welded component 1 by means of shaft end flange 2, bolt through hole fit and positioning shoulder table fit. The two ends of the lower shaft 8 are threadedly fastened to the corresponding surfaces of the first gate frame welded component 1 by the lower shaft end plate 7. The upper shaft 3 and the lower shaft 8 are limited in the axial direction by the shaft retaining ring 10 to ensure that the axial position of the two shafts relative to the first gate frame welded component 1 is stable and without movement. The upper sliding sleeve 4 and the lower sliding sleeve 9 are fixed to the back mounting plate surface of the second gate plate welded component 5 by means of interference positioning welding or detachable stud-nut connection. The inner hole of the two is precisely fitted to the upper shaft 3 and the lower shaft 8 respectively. The hole-shaft fit clearance maintains a small clearance in the radial direction to ensure vertical straight guidance while restricting the freedom of the gate plate in the horizontal direction (sealing and pressing direction).

[0015] Preferably, the hydraulic cylinder 6 is vertically arranged and fixed on the upper mounting seat of the first gate frame welded part 1. Its tail end is hinged to the ear plate hole of the first gate frame welded part 1 through the hydraulic cylinder tail seat connecting shaft 13, so that the hydraulic cylinder 6 can self-align within a small angle. The piston rod end of the hydraulic cylinder 6 is hinged to the upper traction ear plate of the second gate plate welded part 5 by a pin shaft with a locking nut. The long spacer 11 and the short spacer 12 of the hydraulic cylinder shaft are sequentially installed on the piston rod end, forming a stepped shoulder between them. Together with the positioning step on the end face of the piston rod, the amount of hysteresis in the piston rod's force transmission to the door panel is limited; by setting the difference between the total thickness of the cylinder shaft long spacer 11 and the cylinder shaft short spacer 12 and the length of the piston rod end step to about 15mm, the piston rod retains about 15mm of "empty stroke" at the end of each of the retraction (closing) and extension (opening) strokes. During this empty stroke, the axial displacement of the piston rod does not generate a sealing-direction pressing force on the second gate plate welded part 5, but only drives the door panel to translate in the vertical direction. The sealing strip 14 is continuously arranged along the sealing seat surface of the inner periphery of the first gate frame welded part 1, and is reliably fixed to the first gate frame welded part 1 by a dovetail groove or pressure plate screw. The sealing seat surface is located on the horizontal side of the door plate running path. In order to achieve complete separation of the door plate and the sealing strip during the opening and closing process, a circumferentially thickened push section and a tapered guide section are respectively machined at the upper stop position of the upper shaft 3 and the lower shaft 8 along the door plate closing direction. The inner holes of the upper sliding sleeve 4 and the lower sliding sleeve 9 are respectively provided with stepped inner cavities. The two form a constant radial gap by the body cylindrical section-cylindrical hole cooperation during most of the stroke, so that the second gate plate welded part 5 keeps slightly separated from the sealing strip 14 in the horizontal direction when moving vertically.

[0016] More specifically, when the door panel is about 15mm away from the closing end of its stroke, the stepped inner cavity of the upper sliding sleeve 4 and the lower sliding sleeve 9 gradually contacts the pushing section of the upper shaft 3 and the lower shaft 8 and generates a forced slight horizontal displacement along the tapered guide section of the shaft. This causes the door panel to continue moving upward in the vertical direction while making a slight horizontal displacement towards the sealing strip 14, thus achieving linear pressing and adhesion of the sealing strip 14. Conversely, when opening, the piston rod first releases the constraint of the pushing section within about 15mm of its stroke. The door panel returns to the cylindrical guide state in the tapered guide section and completely separates from the sealing strip 14 in the horizontal direction. Subsequently, it only moves downward in the vertical direction without frictional contact with the sealing strip 14 during the remaining full stroke. To ensure a compact structure and long-term stability, the bearing seats on both sides of the first gate frame welded component 1 are fixedly connected to the mounting surfaces of the upper shaft 3 and the lower shaft 8 using positioning stops and through-hole bolt groups. The shaft end flange 2 and the outer side of the lower shaft end plate 7 have reserved maintenance holes to facilitate the assembly and disassembly of the shaft retaining ring 10. The connection surfaces of the upper sliding sleeve 4 and the lower sliding sleeve 9 with the second gate plate welded component 5 use circumferential multi-point welds or countersunk bolt arrays to ensure uniform stress. The front surface of the gate plate is machined with a flat sealing pressure surface and maintains parallelism tolerance with the sealing surface of the sealing strip 14.

[0017] The workflow of this embodiment is as follows: When closing the gate, the hydraulic cylinder 6 retracts and drives the second gate plate welded part 5 to move vertically upward via the piston rod. It first experiences a blank stroke section of about 15mm, during which the gate plate and the sealing strip 14 are completely separated without friction. After continuing to move upward, the upper sliding sleeve 4, the lower sliding sleeve 9, and the pushing sections of the upper shaft 3 and the lower shaft 8 interact, causing the gate plate to move slightly horizontally towards the sealing strip 14 in the last 15mm and complete the sealing and pressing, forming a reliable seal. When opening the gate, the hydraulic cylinder 6 extends and drives the gate plate to move vertically downward first, and releases the pushing section constraint in the first 15mm. The gate plate immediately completely separates from the sealing strip 14 in the horizontal direction, and then moves only vertically downward throughout the entire process to avoid frictional contact with the sealing strip 14. By using the stepped push structure of the guide shaft-sleeve and the stroke delay set by the piston rod end spacer, the motion relationship of "contacting only when close to the closed position and disengaging immediately upon opening" is achieved, which significantly reduces the wear of the door panel and the sealing strip 14, and improves the sealing life and long-term reliability while maintaining a compact structure.

[0018] It should be noted that, in this document, relational terms such as "first" and "second" are used only 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 process, method, article, or apparatus.

[0019] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A bottom-opening flat gate, characterized in that, include: The first gate frame welded component (1) is a frame-type support structure with a shaft mounting part; The gate (15) includes a second gate plate welded part (5), an upper sliding sleeve (4) and a lower sliding sleeve (9), wherein the upper sliding sleeve (4) and the lower sliding sleeve (9) are respectively fixedly installed on the upper part and the lower part of the second gate plate welded part (5); The upper shaft (3) and the lower shaft (8) are respectively inserted into the upper sliding sleeve (4) and the lower sliding sleeve (9) to form a guide pair. The two ends of the upper shaft (3) are fixed to the first gate frame welded part (1) through the shaft end flange (2), and the two ends of the lower shaft (8) are fixed to the first gate frame welded part (1) through the lower shaft end plate (7). The cylinder (6) is hinged to the first gate frame welded part (1) via the cylinder tail seat connecting shaft (13), and the piston rod end is hinged to the second gate plate welded part (5). The piston rod end is fitted with a long cylinder shaft spacer (11) and a short cylinder shaft spacer (12) in sequence, which are used to make the gate (15) move slightly in the horizontal direction towards the sealing strip (14) when the piston rod is close to the end of the stroke; The sealing strip (14) is installed on the sealing seat surface of the inner cavity of the first gate frame welded part (1). The sealing strip (14) and the gate (15) are completely separated after the initial stroke of opening, and are pressed into contact during the final stroke of closing.

2. A bottom-opening flat gate according to claim 1, characterized in that, The upper shaft (3) and the lower shaft (8) are provided with a push section and a tapered guide section on their outer periphery. The inner holes of the upper sliding sleeve (4) and the lower sliding sleeve (9) have a stepped shoulder structure that matches them, which is used to form a horizontal guide pressing at the end of the closing section.

3. A bottom-opening flat gate according to claim 1, characterized in that, There is a step difference between the long spacer (11) and the short spacer (12) of the cylinder shaft, which, together with the stepped structure at the piston rod end, forms an opening and closing delay stroke, so that the sealing action only occurs within the stroke range of about 15mm at the end of the closing and about 15mm at the beginning of the opening.

4. A bottom-opening flat gate according to claim 1, characterized in that, The upper sliding sleeve (4) and the lower sliding sleeve (9) are installed on the second gate welding part (5) by bolt connection or welding.

5. A bottom-opening flat gate according to claim 1, characterized in that, The sealing strip (14) is fixed to the first gate frame welded part (1) by pressure plate screws or dovetail groove structure, and the contact surface between the sealing strip (14) and the gate (15) is a parallel sealing surface structure.

6. A bottom-opening flat gate according to claim 1, characterized in that, The first gate frame welded component (1), gate (15), guide pair, oil cylinder (6) and its connecting structure are all made of 304 stainless steel.

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