Positioning die of a manhole cover forming hydraulic press

Abstract

The utility model relates to mechanical mould processing equipment technical field, the utility model provides a kind of well lid forming hydraulic press positioning mould and support, and the hydraulic guide mechanism installed in the outside of support, hydraulic guide mechanism includes the hydraulic cylinder fixedly connected in the top of support, the output end bottom of hydraulic cylinder is fixedly connected with support arm, support arm's both sides are fixedly connected with buffer pad, buffer pad is slidingly connected in the outer wall of support, the bottom of support arm is connected with fixed plate, the outer wall of support is connected with guide rod.The utility model provides a kind of well lid forming hydraulic press positioning mould, limit horizontal shaking by external guide rod, and micron level accurate positioning is realized in cooperation with internal pinhole, significantly improve well lid forming precision solve the technical problems that the guiding precision is insufficient in the moulding process of well lid forming hydraulic press in prior art, upper and lower mould aligns inaccurately and is prone to cause well lid forming quality to be poor, mould is easily damaged due to lateral shaking.

Description

Technical Field

[0001] This utility model relates to the field of mechanical mold processing equipment technology, specifically to a positioning mold for a hydraulic press for forming manhole covers. Background Technology

[0002] As a crucial sealing component in urban drainage and sewage systems, the quality of manhole covers directly affects road traffic safety and the normal operation of urban infrastructure. Currently, the main manufacturing process for manhole covers involves pressing and molding using a hydraulic press with upper and lower molds. In the specific production process, the hydraulic cylinder of the hydraulic press drives the upper mold to move downward, causing the upper mold to close with the lower mold fixed at the bottom. High pressure is then applied to solidify the resin composite material or metal material filled in the mold. However, existing manhole cover molding equipment suffers from insufficient guiding and positioning capabilities in its structural design.

[0003] Because existing hydraulic presses lack precise and stable external constraint mechanisms during the long-distance downward movement of the upper die, the piston rod of the hydraulic cylinder will sway horizontally or deviate laterally when it is pressed down at high speed or when it encounters resistance in contact with the raw material. This instability in the motion trajectory will cause the upper die to fail to ensure that the center lines of the two are strictly aligned when it approaches the lower die, resulting in misalignment or edge collision between the upper and lower dies at the moment of mold closing. The misalignment of the mold will not only cause uneven wall thickness, severe edge flash, or even overall deformation of the pressed manhole cover products, but also damage to the precision surface inside the mold or breakage of positioning components due to abnormal hard impacts, thus greatly shortening the service life of expensive molds and increasing production costs.

[0004] Furthermore, relying solely on the rigidity of the hydraulic cylinder itself to maintain the verticality of the movement is no longer sufficient to meet the requirements of high precision and high efficiency in modern manhole cover production. Existing equipment has failed to form a complete constraint system from external motion guidance to internal mold positioning, and cannot effectively resist the lateral tension and vibration generated during the molding process, resulting in a high scrap rate and safety hazards during production. Therefore, it is urgent to improve the existing manhole cover molding mold structure.

[0005] Therefore, this utility model proposes a positioning mold for a hydraulic press for forming manhole covers to overcome the shortcomings of the prior art. Utility Model Content

[0006] To overcome the above-mentioned defects, the present invention provides a positioning mold for a hydraulic press for forming manhole covers, which solves the technical problems of insufficient guiding accuracy, inaccurate alignment of upper and lower molds, poor manhole cover forming quality and easy mold damage caused by lateral shaking in the existing hydraulic press for forming manhole covers during the molding process.

[0007] According to one aspect, at least one embodiment of the present invention provides a positioning mold for a hydraulic press for forming manhole covers, comprising: a bracket, and a hydraulic guiding mechanism installed on the outside of the bracket, wherein the hydraulic guiding mechanism includes a hydraulic cylinder fixedly connected to the top of the bracket, a support arm fixedly connected to the bottom of the output end of the hydraulic cylinder, buffer pads fixedly connected to both sides of the support arm, the buffer pads slidably connected to the outer wall of the bracket, a fixing plate connected to the bottom of the support arm, a guide rod connected to the outer wall of the bracket, the fixing plate slidably connected to the guide rod, an upper mold connected to the output end of the hydraulic cylinder, a lower mold provided on the bottom inner side of the bracket, a positioning pin fixedly connected to the bottom of the upper mold, and a positioning hole cooperating with the positioning pin on the top of the lower mold.

[0008] The fixed plate and the guide rod are engaged by a sliding friction pair, which restricts the freedom of the support arm in the horizontal direction. The sliding contact between the buffer pad and the outer wall of the bracket provides preliminary position calibration and buffering function. The insertion and engagement of the positioning pin and the positioning hole at the end of the mold closing stage achieves precise alignment at the micro level. Together, the three constitute a complete positioning and guiding system.

[0009] Preferably, a fixing mechanism is installed on the inner side of the bracket. The fixing mechanism includes a base disposed on the left and right sides of the lower mold. A hydraulic rod is fixedly connected to the top of the base. A clamping plate is fixedly connected to the output end of the hydraulic rod. The clamping plate can move horizontally under the drive of the hydraulic rod and tightly abut against the side walls of the upper mold and the lower mold, thereby providing strong lateral locking after mold closing and preventing the mold from expanding or misaligning during high-pressure molding.

[0010] Preferably, the upper middle part of the bracket has support rods slidably connected to the front and rear ends on both sides. The support rods can be pushed and inserted into the interior of the bracket and are located below the movement path of the support arm. The support rods serve as a mechanical anti-fall device to physically support the support arm when not in operation, effectively preventing the components from accidentally slipping due to hydraulic system depressurization or mechanical fatigue.

[0011] Preferably, a sensor is fixedly connected to the bottom front side of the output end of the hydraulic cylinder, and the upper mold is fixedly connected to the sensor. The sensor is connected in series in the force transmission path between the hydraulic cylinder and the upper mold, which can monitor the downward pressure in real time and feed it back to the control system to realize closed-loop control of pressure, thereby avoiding mold damage or material scrap due to excessive pressure.

[0012] Preferably, supports are fixedly connected to the four corners of the bottom of the lower mold. The supports are supported between the lower mold and the inner bottom wall of the bracket. The supports not only level the lower mold, but also provide a stable bottom support for the lower mold, ensuring the effective transmission of pressing force.

[0013] Preferably, the support arm is located around the bottom of the hydraulic cylinder output end, and the buffer pad is located at the front and rear ends of both sides of the support arm. This support structure distributed around the perimeter, combined with multi-point buffer guidance, can maximize the dispersion of force and improve the stability and resistance to eccentric loads during movement.

[0014] Preferably, the fixing plate is threaded to the bottom of the support arm. The threaded connection allows for fine adjustment of the height of the fixing plate to adapt to the installation requirements of molds of different specifications or to compensate for long-term wear gaps.

[0015] Preferably, the guide rod is threaded to the front and rear ends of the upper middle part of the outer wall of the bracket, and the guide rod forms a stable rigid connection with the outer wall of the bracket, providing a precise and straight guide rail reference for the up and down sliding of the fixed plate.

[0016] Preferably, the positioning pins are located at the front and rear ends of both sides of the bottom of the upper mold, and the positioning holes are located at the corresponding positions at the front and rear ends of both sides of the top of the lower mold. This symmetrically distributed pin-hole mating structure can automatically correct the slight positional deviation of the upper mold relative to the lower mold at the moment of mold closing, ensuring the geometric accuracy of the molding cavity.

[0017] The beneficial effects of this utility model are as follows: 1. This utility model solves the problem of inaccurate alignment of upper and lower molds and poor manhole cover forming quality caused by insufficient guiding accuracy in the existing hydraulic press during the molding process by setting a hydraulic guiding mechanism on the outside of the support and setting a matching structure of positioning pin and positioning hole inside the mold. It achieves the effect of limiting horizontal sway by using the dual guidance of external buffer pad and guide rod, and achieving micron-level precise positioning by combining the internal pin hole, thereby significantly improving the forming accuracy and pass rate of manhole covers.

[0018] 2. This utility model solves the problem in the prior art where the upper and lower molds are prone to lateral displacement or expansion due to internal tension during high-pressure molding by setting a fixing mechanism including a hydraulic rod and a clamping plate at the bottom inner side of the bracket. This achieves the effect of strong clamping and fixing of the upper and lower molds from the side after mold closing, making the overall rigidity of the mold stronger, ensuring the stability and reliability of the molding process, and further improving the density of the manhole cover edge and the quality of the finished product.

[0019] 3. This utility model, by installing an insertable support rod in the upper part of the bracket and configuring a pressure sensor at the output end of the hydraulic cylinder, solves the safety hazards caused by the accidental fall of suspended parts due to mechanical fatigue when the equipment is not in operation, as well as the problem of material or equipment damage due to uncontrolled pressure during the molding process. It achieves reliable fall protection using a physical support rod and closed-loop control through real-time pressure monitoring by sensors, thereby significantly improving the safety and intelligence level of the equipment. Attached Figure Description To more clearly illustrate the technical solutions in the embodiments of this utility model, the accompanying drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are merely some exemplary embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the exemplary embodiments of this utility model and these drawings without any creative effort.

[0020] Figure 1 This is a perspective view of a positioning mold for a hydraulic press for forming manhole covers, according to one embodiment of the present invention. Figure 2 This is a front view of a positioning mold for a hydraulic press for forming manhole covers, according to one embodiment of the present invention. Figure 3 This is a partial structural diagram of a positioning mold for a hydraulic press for forming manhole covers, according to one embodiment of the present invention. Figure 4 This is a partial structural schematic diagram of a positioning mold for a hydraulic press for forming manhole covers, according to one embodiment of the present invention. In the diagram: 1. Bracket; 2. Hydraulic guiding mechanism; 201. Hydraulic cylinder; 202. Support arm; 203. Fixing plate; 204. Buffer pad; 205. Guide rod; 206. Support rod; 207. Sensor; 3. Fixing mechanism; 301. Base; 302. Hydraulic rod; 303. Clamping plate; 304. Positioning hole; 305. Positioning pin; 306. Support; 307. Lower mold; 308. Upper mold Detailed Implementation The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit its scope.

[0021] To keep the drawings concise, only the parts relevant to the utility model are shown schematically in each drawing; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of the components with the same structure or function is schematically shown, or only one is labeled. In this document, "a" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0022] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0023] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0024] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0025] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0026] like Figures 1 to 4As shown, this invention illustrates a positioning mold for a hydraulic press for forming manhole covers, comprising a support 1, a hydraulic guiding mechanism 2, and a fixing mechanism 3 installed inside the support 1 to support the mold and achieve high-tightness locking. The support 1 is made of high-strength alloy steel, welded or cast, and has a gantry-type or four-column frame structure, designed to provide a stable installation foundation for the entire hydraulic press and withstand the huge reaction force generated during the molding process. The hydraulic guiding mechanism 2 is not a single power output unit, but a composite mechanism integrating power drive, directional constraint, position calibration, and stroke buffer. The fixing mechanism 3 is mainly responsible for the installation and positioning of the mold body and the lateral reinforcement after mold closing. The positioning mold for a hydraulic press for forming manhole covers in this embodiment is mainly used in the pressing and molding process of various ductile iron manhole covers, resin manhole covers, or composite material manhole covers in municipal construction. Targeted structural improvements have been made to address the technical pain points in the prior art, such as the easy lateral shaking during the downward movement of the hydraulic press head, the reliance on manual experience for mold alignment accuracy, and the easy occurrence of slight misalignment of the mold after mold closing.

[0027] This embodiment provides a positioning mold for a hydraulic press for forming manhole covers. Through the dual limiting cooperation of the external guide rod 205 and the internal buffer pad 204 in the hydraulic guide mechanism 2, combined with the micron-level precise docking of the positioning pin 305 and the positioning hole 304 in the fixing mechanism 3, and the auxiliary locking of the lateral hydraulic rod 302, zero-deviation operation is achieved throughout the entire process of manhole cover molding, which greatly improves the dimensional accuracy and mechanical properties of the finished manhole cover.

[0028] See in some examples Figure 1 and Figure 2The hydraulic guiding mechanism 2 includes a main hydraulic cylinder 201 fixedly connected to the center of the top of the bracket 1. The hydraulic cylinder 201 is vertically fixed downwards by a high-strength bolt group or flange to ensure that the axis of the output shaft is strictly perpendicular to the horizontal plane. The bottom of the output end of the hydraulic cylinder 201 is not directly connected to the mold, but is first connected to a support arm 202 for transmitting power and expanding the guiding area. The support arm 202 is made of cast steel and has an overall cross-shaped or rectangular frame structure radiating from the center. The support arm 202 is arranged around the bottom of the output end of the hydraulic cylinder 201. This design can effectively distribute the single-point concentrated force output by the hydraulic cylinder 201 to the surrounding area, avoiding deformation of the mold center due to excessive force concentration. In order to eliminate the support The horizontal swaying generated during the up-and-down movement of the support arm 202 is addressed by fixing buffer pads 204 to both the front and rear ends of the support arm 202 with screws or slots. The buffer pads 204 are preferably made of high molecular weight polyethylene material with excellent wear resistance and a certain degree of elasticity or copper alloy material filled with lubricating graphite. The outer surface of the buffer pads 204 maintains close sliding contact with the outer wall surface of the bracket 1. The buffer pads 204 act as sliding bearings here. On the one hand, they reduce the resistance when the support arm 202 moves by utilizing their own low coefficient of friction. On the other hand, they absorb the small vibrations during the operation of the equipment by utilizing their own elastic deformation, thereby calibrating the position of the support arm 202 and ensuring that the support arm 202 always stays on the geometric center line of the bracket 1 without tilting.

[0029] Furthermore, to construct a more rigid guiding system, the fixing plate 203 can be configured as a frame structure surrounding the outer wall of the bracket 1 or a split plate structure, please refer to [reference needed]. Figure 2 The bottom of the support arm 202 is fitted with a fixing plate 203 via a threaded connection. This threaded connection allows for fine-tuning of the height of the fixing plate 203 to accommodate molds of varying thicknesses. Simultaneously, guide rods 205 are vertically mounted on both the front and rear ends of the upper part of the outer wall of the bracket 1 via threaded connections. The guide rods 205 are cylindrical steel bars with a hardened and chrome-plated surface, exhibiting extremely high surface hardness and smoothness. The fixing plate 203 has guide holes that match the diameter of the guide rods 205, or the fixing plate 203 can be directly fitted onto the guide rods. The guide rod 205 forms a sliding friction pair on the outer wall of the fixed plate 203. When the support arm 202 drives the fixed plate 203 to move up and down under the drive of the hydraulic cylinder 201, the guide rod 205 forcibly defines the movement trajectory of the fixed plate 203 like a rail. Since the guide rod 205 is distributed on both sides of the bracket 1 at the front and rear ends, it forms a large-span guide rectangle. This layout greatly enhances the torsional resistance of the mechanism. Even if the mold is subjected to uneven force, it can ensure the absolute verticality of the pressing process, thus effectively providing a guarantee for subsequent molding.

[0030] Please refer to Figure 3 and Figure 4 In some embodiments, the fixing mechanism 3 further includes an upper mold 308, a lower mold 307, and matching positioning components. Specifically, the output end of the hydraulic cylinder 201 is connected to the upper mold 308 after passing through the center of the support arm 202. The upper mold 308 is a key component for forming the pattern and shape of the upper surface of the manhole cover. A lower mold 307 is horizontally arranged at the bottom inner side of the bracket 1. The lower mold 307 is used to form the lower surface and edge features of the manhole cover. Supports 306 are fixed to the four corners of the bottom of the lower mold 307 by welding or bolting. The bottom of the supports 306 is firmly supported on the inner bottom wall of the bracket 1. The height of the supports 306 is precisely calculated to ensure that the lower mold 307 is at the optimal operating height. To solve the misalignment problem that occurs between the upper mold 308 and the lower mold 307 at the moment of closure, the upper mold... Positioning pins 305 are vertically fixed to the bottom sides of the upper mold 308 at both ends. The ends of the positioning pins 305 are usually machined with tapered guide angles to facilitate insertion. Positioning holes 304 are provided on the top sides of the lower mold 307 at positions that correspond exactly to the positioning pins 305. The inner diameter of the positioning hole 304 and the outer diameter of the positioning pin 305 are tightly fitted with a clearance. When the hydraulic cylinder 201 moves the upper mold 308 downwards and approaches the closed state, the positioning pins 305 will be inserted into the positioning holes 304 first. Through the rigid contact between the pin and the hole, the slight horizontal displacement of the upper mold 308 is forcibly corrected, so as to achieve accurate alignment and installation of the upper mold 308 and the lower mold 307. This mechanism of guiding first and then closing the mold ensures the integrity of each molding and avoids mold damage or product scrap caused by misalignment.

[0031] In this embodiment, the external macroscopic guidance of the buffer pad 204 and the guide rod 205, combined with the internal microscopic positioning of the positioning pin 305 and the positioning hole 304, forms a complete positioning system that combines coarse and fine positioning. This avoids the defect of insufficient accuracy of a single guiding method and helps to improve the overall operational stability of the equipment and the product qualification rate.

[0032] In this embodiment, since a huge pressure needs to be applied during the molding of the manhole cover, the material flow inside the mold will generate a large lateral tension. In order to prevent the upper mold 308 and the lower mold 307 from expanding or sliding laterally after the mold is closed, lateral clamping assemblies are provided on the left and right sides of the lower mold 307, including a base 301 fixedly installed on the inner bottom wall of the bracket 1. The base 301 is located outside the lower mold 307. A horizontally inwardly arranged hydraulic rod 302 is fixedly connected to the top of the base 301. The hydraulic rod 302 serves as a lateral power source, and its output end is fixedly connected to a block or plate-shaped component. The clamping plate 303 has a textured surface with a high coefficient of friction or a rubber pad on its inner side. When the upper mold 308 and the lower mold 307 are closed in place, the hydraulic rods 302 on both sides are activated to drive the clamping plate 303 to move towards the center until the clamping plate 303 tightly abuts against the side joint of the upper mold 308 and the lower mold 307. Through this physical clamping, the upper mold 308 and the lower mold 307 can be firmly fixed together to form an inseparable rigid unit, which greatly improves the forming effect of the manhole cover and ensures the density of the manhole cover edge.

[0033] To improve the design of pressure control and equipment safety protection, this embodiment also introduces a closed-loop pressure monitoring and physical fall protection mechanism. A high-precision pressure sensor 207 is fixedly connected to the bottom front side of the output end of the hydraulic cylinder 201. The upper mold 308 is not directly connected to the hydraulic cylinder 201, but is connected through the sensor 207. That is, the upper end of the sensor 207 is connected to the output shaft of the hydraulic cylinder 201, and the lower end is connected to the upper mold 308. The sensor 207 can monitor the downward pressure transmitted from the hydraulic cylinder 201 to the upper mold 308 in real time and dynamically, and feed the data back to the control system. The operator can set the pressure threshold and drive the hydraulic cylinder 201 to press down as needed. Once the pressure exceeds the safety value, the system immediately stops pressurizing, thereby preventing the material from being crushed by overpressure and the equipment from being damaged by overload.

[0034] Furthermore, considering the possibility of pressure leakage in the hydraulic system after prolonged operation, or the accidental slippage of suspended heavy components due to gravity during equipment maintenance shutdowns, through holes are provided at the front and rear ends of both sides of the upper middle part of the bracket 1, and support rods 206 are slidably connected thereto. The support rods 206 are high-strength solid steel bars. When mold pressing is not required, or when the equipment is in standby maintenance mode, the hydraulic cylinder 201 raises the support arm 202 to a predetermined safe height. At this time, the operator manually or through an electric push rod pushes the support rod 206 inward, so that the support rod 206 inserts into the bracket 1 and extends directly below the movement path of the support arm 202. At this time, the support rod 206 acts like a pin, physically supporting the support arm 202. Even if the hydraulic cylinder 201 completely fails, the support arm 202 will fall onto the support rod 206 and will not fall on the mold or personnel below. This purely mechanical support structure effectively prevents the risk of the support arm 202 falling due to mechanical fatigue.

[0035] Working principle: When pressing is required, the hydraulic cylinder 201 is first activated. The hydraulic cylinder 201 drives the support arm 202 and the upper mold 308 connected to the output end of the hydraulic cylinder 201 to move downward. During the downward movement, the buffer pads 204 installed on both sides of the support arm 202 slide along the outer wall of the bracket 1 to perform preliminary position calibration and buffering of the support arm 202, ensuring that the support arm 202 always stays in the middle position. At the same time, the fixing plate 203 at the bottom of the support arm 202 slides along the guide rod 205 on the outer wall of the bracket 1. Through the tight cooperation between the fixing plate 203 and the guide rod 205, the movement trajectory of the support arm 202 is strictly limited to the vertical direction, effectively preventing horizontal swaying and providing a stable movement basis for subsequent precise pressing. During this process, the sensor 207 continuously monitors the downward pressure of the hydraulic cylinder 201 and drives the hydraulic cylinder 201 to apply pressure as needed according to the set value to prevent material damage or equipment damage due to abnormal pressure. When the upper mold 308 descends to a position close to the lower mold 307, the positioning pin 305 at the bottom of the upper mold 308 is precisely inserted into the positioning hole 304 at the top of the lower mold 307. This pin-hole engagement achieves micron-level alignment and rapid positioning of the upper mold 308 and the lower mold 307, ensuring accurate mold positioning. Subsequently, the hydraulic rod 302 installed on the base 301 is activated, and the hydraulic rod 302 pushes the clamping plate 303 to move towards the center until the clamping plate 303 tightly clamps the side walls of the upper mold 308 and the lower mold 307, thereby firmly fixing the upper mold 308 and the lower mold 307 together. This lateral locking further improves the stability of the mold under high pressure and ensures the forming effect of the manhole cover. When the molding work is completed or when molding is no longer required, the hydraulic cylinder 201 drives the support arm 202 to be raised to a safe height. At this time, the operator can insert the support rod 206 into the bracket 1 and extend it to the bottom of the support arm 202. The support rod 206 is used to physically support the support arm 202, thereby effectively preventing the safety hazard of the support arm 202 falling accidentally due to mechanical fatigue caused by long-term suspension.

[0036] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A positioning mold for a hydraulic press for forming manhole covers, characterized in that, include: The bracket (1) and the hydraulic guide mechanism (2) installed on the outside of the bracket (1); The hydraulic guiding mechanism (2) is characterized in that it includes a hydraulic cylinder (201) fixedly connected to the top of the bracket (1), a support arm (202) fixedly connected to the bottom of the output end of the hydraulic cylinder (201), a buffer pad (204) fixedly connected to both sides of the support arm (202), the buffer pad (204) being slidably connected to the outer wall of the bracket (1), a fixing plate (203) being connected to the bottom of the support arm (202), a guide rod (205) being connected to the outer wall of the bracket (1), and the fixing plate (203) being slidably connected to the guide rod (205).

2. The positioning mold for a hydraulic press for forming manhole covers according to claim 1, characterized in that, The output end of the hydraulic cylinder (201) is connected to the upper mold (308), the bottom of the inner side of the bracket (1) is provided with the lower mold (307), the bottom of the upper mold (308) is fixedly connected with the positioning pin (305), and the top of the lower mold (307) is provided with a positioning hole (304) that cooperates with the positioning pin (305).

3. The positioning mold for a hydraulic press for forming manhole covers according to claim 2, characterized in that, A fixing mechanism (3) is installed on the inner side of the bracket (1). The fixing mechanism (3) includes a base (301) set on the left and right sides of the lower mold (307). A hydraulic rod (302) is fixedly connected to the top of the base (301). A clamping plate (303) is fixedly connected to the output end of the hydraulic rod (302).

4. The positioning mold for a hydraulic press for forming manhole covers according to claim 1, characterized in that, Support rods (206) are slidably connected to the front and rear ends of the upper middle part of the bracket (1). The support rods (206) are inserted into the inside of the bracket (1) and located below the support arm (202).

5. The positioning mold for a hydraulic press for forming manhole covers according to claim 2, characterized in that, A sensor (207) is fixedly connected to the bottom front side of the output end of the hydraulic cylinder (201), and the upper mold (308) is fixedly connected to the sensor (207).

6. The positioning mold for a hydraulic press for forming manhole covers according to claim 2, characterized in that, Supports (306) are fixedly connected to the four corners of the bottom of the lower mold (307), and the supports (306) are supported between the lower mold (307) and the bracket (1).

7. The positioning mold for a hydraulic press for forming manhole covers according to claim 1, characterized in that, The support arm (202) is located around the bottom of the output end of the hydraulic cylinder (201), and the buffer pad (204) is located at the front and rear ends of both sides of the support arm (202).

8. The positioning mold for a hydraulic press for forming manhole covers according to claim 1, characterized in that, The fixing plate (203) is threaded to the bottom of the support arm (202).

9. The positioning mold for a hydraulic press for forming manhole covers according to claim 1, characterized in that, The guide rod (205) is threaded to the front and rear ends of the upper middle part of the outer wall of the bracket (1).

10. A positioning mold for a hydraulic press for forming manhole covers according to claim 2, characterized in that, The positioning pins (305) are located at the front and rear ends of both sides of the bottom of the upper mold (308), and the positioning holes (304) are located at the corresponding positions of the front and rear ends of both sides of the top of the lower mold (307).

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