All-in-one preparation jig based on modular PRB reaction wall
By using a modular, multi-functional jig with a pressure plate and a self-ejecting feeding mechanism, the problems of uneven packing and safety risks in PRB reactive wall packing were solved, achieving efficient and safe packing forming and unloading, and improving production efficiency and packing uniformity.
Patent Information
- Application Number
- CN202410680774.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-29
- Publication Date
- 2025-12-16
- Estimated Expiration
- 2044-05-29
AI Technical Summary
The existing PRB reactive wall packing operation is cumbersome and uneven, with high safety risks, making it difficult to achieve efficient and safe packing molding and material removal.
A modular, all-in-one manufacturing fixture is adopted. Through the elastic connection of four sets of pressure plates and the self-ejecting mechanism, modular extrusion molding and material handling of PRB packing are realized. The return spring and guide rail ensure the precise pressing and expansion of the pressure plates, and the self-ejecting mechanism realizes the automated ejection of the packing.
It achieves efficient, safe, and modular molding and material handling of PRB packing, reducing operational difficulty and safety risks, and improving the uniformity of packing and production efficiency.
Smart Images

Figure CN118619392B_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The application relates to the technical field of underground sewage remediation, and particularly relates to a multi-in-one preparation jig for a PRB reaction wall based on modularization. BACKGROUND
[0002] With the development of science and technology, the demand for gold ore will be increasingly large, which will promote the continuous innovation and development of the mining technology of the gold ore. Before the gold ore is mined, a corresponding environmental optimization scheme is usually constructed to solve the environmental pollution problem. The PRB reaction wall can be used as a composite filling scheme for optimizing various fillers, and can be used as an underground sewage remediation zone to provide reliable protection measures for the risk control and pollution remediation of the underground water.
[0003] The PRB reaction wall technology is an in-situ remediation technology for underground water pollution, which is constructed underground to form a permeable reaction wall or a reaction zone. When the contaminated underground water flows through the reaction wall or the reaction zone, the pollutants can be removed. The PRB permeable reaction medium includes activated carbon, peat, montmorillonite, lime, sawdust or other reaction intercepting materials. The medium is placed downstream of the contaminated underground water flow and is perpendicular to the flow direction of the underground water. Through the precipitation, adsorption, oxidation-reduction, fixation and biodegradation of the pollutants and the medium, the pollutants in the underground water are removed.
[0004] The existing PRB reaction wall is usually constructed by constructing a corresponding filler frame underground, and then pouring the prepared PRB filler into the filler frame to form a PRB reaction zone. However, the filler filling operation of the PRB reaction wall prepared in the existing form is relatively complicated, and the PRB filler cannot be uniformly and smoothly filled during the filling. Therefore, the filling direction needs to be continuously adjusted or manually laid, which is time-consuming and laborious, and the operation safety risk is high. Therefore, the technical personnel in the field provide a multi-in-one preparation jig for a PRB reaction wall based on modularization to solve the problems in the background technology. SUMMARY
[0005] The application aims to provide a multi-in-one preparation jig for a PRB reaction wall based on modularization to solve the problems in the background technology.
[0006] To achieve the above-mentioned purpose, the application provides the following technical scheme: a multi-in-one preparation jig for a PRB reaction wall based on modularization, comprising a lower base and an upper pressure seat installed above the lower base, and the lower base and the upper pressure seat are fixedly connected through an arm force guide rod installed at the corner end thereof.
[0007] The arm rod outside of the arm force guide rod is sequentially sleeved with a first pressing plate, a second pressing plate, a third pressing plate and a fourth pressing plate from top to bottom, and the first pressing plate, the second pressing plate, the third pressing plate and the fourth pressing plate are sequentially connected by reset springs sleeved on the arm rod outside of the arm force guide rod.
[0008] The lower end of the plate seat of the first pressing plate is provided with a first die plate A, the upper end of the plate seat of the second pressing plate is provided with a first die plate B opposite to the first die plate A, the lower end of the plate seat of the second pressing plate is provided with a second die plate A, the upper end of the plate seat of the third pressing plate is provided with a second die plate B opposite to the second die plate A, the lower end of the plate seat of the third pressing plate is provided with a third die plate A, and the upper end of the plate seat of the fourth pressing plate is provided with a third die plate B opposite to the third die plate A.
[0009] The inner part of the plate seat of the second pressing plate, the third pressing plate and the fourth pressing plate is respectively provided with a self-top feeding mechanism penetrating the first die plate B, the second die plate B and the third die plate B.
[0010] As a further scheme of the present application, the reset spring and the arm force guide rod are mutually sleeved and slid, and the first pressing plate, the second pressing plate, the third pressing plate and the fourth pressing plate are sequentially connected by the reset spring and the arm force guide rod.
[0011] As a further scheme of the present application, the support inside of the support of the lower base is provided with a buffer spring supporting the fourth pressing plate in a two-by-two symmetric form.
[0012] As a further scheme of the present application, the support front and rear ends of the lower base and the upper pressing seat are provided with guide rails guiding the first pressing plate, the second pressing plate, the third pressing plate and the fourth pressing plate in a two-by-two symmetric form, and the guide rail frame of each group of guide rails is provided with a rail sliding groove.
[0013] As a further scheme of the present application, the front and rear ends of the plate seat of the first pressing plate are provided with first guide sliding buckles guiding the rail sliding groove in a two-by-two symmetric form.
[0014] The front and rear ends of the plate seat of the second pressing plate are provided with second guide sliding buckles guiding the rail sliding groove in a two-by-two symmetric form.
[0015] The front and rear ends of the plate seat of the third pressing plate are provided with third guide sliding buckles guiding the rail sliding groove in a two-by-two symmetric form.
[0016] The front and rear ends of the plate seat of the fourth pressing plate are provided with fourth guide sliding buckles guiding the rail sliding groove in a two-by-two symmetric form.
[0017] As a further scheme of the present application: the self-ejecting mechanism comprises an ejecting cavity sequentially formed in the second pressing plate, the third pressing plate and the fourth pressing plate support, two groups of rotating bases are symmetrically arranged in the cavity of the ejecting cavity, a rotating sleeve is rotatably connected to the upper end of the support of each group of rotating bases, a lifting lead screw is screwed into the core sleeve of the rotating sleeve, a lifting platform penetrating the first mold plate B, the second mold plate B and the third mold plate B is arranged at the top end of the shaft of the lifting lead screw, a guide sliding seat is arranged between the two groups of rotating bases in the cavity of the ejecting cavity, a transmission guide rod is connected through the support of the guide sliding seat, a tension spring is arranged at one end of the arm of the transmission guide rod, and an arm force pulling rope is arranged at the other end of the arm of the transmission guide rod, and the arm force pulling rope is sequentially connected with the first pressing plate, the second pressing plate and the third pressing plate.
[0018] As a further scheme of the present application: the shaft sleeve of the two groups of rotating sleeves is sleeved with a transmission gear, and the arm of the transmission guide rod is provided with a transmission rack meshing with the transmission gear.
[0019] As a further scheme of the present application: the bottom plate surface of the first mold plate B, the second mold plate B and the third mold plate B is sequentially provided with a through slot matched with the ejecting platform.
[0020] Compared with the prior art, the present application has the following advantages:
[0021] The present application is based on the integral assembly of four groups of pressing plates, and has good mold opening and closing performance under the elastic guidance of the corresponding arm force guide rod and the reset spring. Only PRB fillers are put into three groups of mold plates, and then the four groups of pressing plates are pressed together to push the three groups of mold plates to close and extrude the PRB fillers in a multi-in-one form. After the PRB fillers are formed, the four groups of pressing plates are opened at one time by the reset stretching performance of the corresponding reset spring, and the expansion tension is converted into driving force and transmitted to the self-ejecting mechanism to control the ejecting platform to push out the extruded PRB fillers, which is convenient for taking out the fillers and completes the modular integrated pressing forming and taking out process of the PRB fillers. The present application can replace the traditional PRB reaction wall formed by filling, and the modular PRB fillers can be filled one by one to complete the construction of the PRB reaction wall, which is safe, simple and convenient, and has high modular precision, and is more conducive to popularization and use. BRIEF DESCRIPTION OF DRAWINGS
[0022] Figure 1 It is a structure diagram of a multi-in-one preparation jig of a modular PRB reaction wall;
[0023] Figure 2It is an assembly diagram of arm force guide rod and reset spring in a multi-in-one preparation jig based on a modular PRB reaction wall.
[0024] Figure 3 It is an assembly diagram of the first pressing plate in a multi-in-one preparation jig based on a modular PRB reaction wall.
[0025] Figure 4 It is an assembly diagram of the second pressing plate in a multi-in-one preparation jig based on a modular PRB reaction wall.
[0026] Figure 5 It is an assembly diagram of the third pressing plate in a multi-in-one preparation jig based on a modular PRB reaction wall.
[0027] Figure 6 It is an assembly diagram of the fourth pressing plate in a multi-in-one preparation jig based on a modular PRB reaction wall.
[0028] Figure 7 It is a structural diagram of a self-ejecting mechanism in a multi-in-one preparation jig based on a modular PRB reaction wall.
[0029] Figure 8 It is a plan view of a self-ejecting mechanism in a multi-in-one preparation jig based on a modular PRB reaction wall.
[0030] Figure 9 It is an assembly diagram of arm force pulling rope in a multi-in-one preparation jig based on a modular PRB reaction wall.
[0031] In the figure: 1, lower base; 2, upper pressing seat; 3, arm force guide rod; 4, reset spring; 5, first pressing plate; 6, second pressing plate; 7, third pressing plate; 8, fourth pressing plate; 9, guide rail; 10, rail sliding groove; 11, buffer spring; 12, first guide sliding buckle; 13, first template A; 14, first template B; 15, second guide sliding buckle; 16, second template A; 17, second template B; 18, third guide sliding buckle; 19, third template A; 20, third template B; 21, fourth guide sliding buckle; 22, tension spring; 23, ejecting cavity; 24, rotating base; 25, rotating wire sleeve; 26, lifting screw; 27, ejecting platform; 28, arm force pulling rope; 29, guide sliding seat; 30, transmission guide rod; 31, transmission gear; 32, transmission rack. DETAILED DESCRIPTION
[0032] Please refer to Figures 1-9The embodiment of the application discloses a multi-in-one preparation jig based on a modular PRB reaction wall, which comprises a lower base 1 and an upper pressing seat 2 installed above the lower base 1, the lower base 1 and the upper pressing seat 2 are fixedly connected through arm force guide rods 3 installed at the corner ends of the lower base 1 and the upper pressing seat 2, the outer sides of the arm rods of the arm force guide rods 3 are sequentially sleeved with first pressing plates 5, second pressing plates 6, third pressing plates 7 and fourth pressing plates 8 from top to bottom, and the first pressing plates 5, the second pressing plates 6, the third pressing plates 7 and the fourth pressing plates 8 adjacent to each other are sequentially connected through reset springs 4 sleeved on the outer sides of the arm rods of the arm force guide rods 3, the reset springs 4 and the arm force guide rods 3 are slidably sleeved with each other, and the first pressing plates 5, the second pressing plates 6, the third pressing plates 7 and the fourth pressing plates 8 adjacent to each other are sequentially and elastically slidably connected through the reset springs 4 and the arm force guide rods 3, the reset springs 4 are used as elastic connecting components between the first pressing plates 5, the second pressing plates 6, the third pressing plates 7 and the fourth pressing plates 8 adjacent to each other, on one hand, the reset springs 4 can play a buffering performance, so that the first pressing plates 5, the second pressing plates 6, the third pressing plates 7 and the fourth pressing plates 8 adjacent to each other are elastically pressed, and then three groups of templates are elastically and bufferingly pressed, the hard impact strength is reduced, and the elastic buffering protection effect is achieved, on the other hand, the reset springs 4 can play a self-supporting and connecting effect, so that the first pressing plates 5, the second pressing plates 6, the third pressing plates 7 and the fourth pressing plates 8 adjacent to each other are integrally connected, after the PRB filler is integrally extruded, the elastic stretching of the reset springs 4 can drive the four groups of pressing plates to be synchronously expanded and opened, and the subsequent material taking and discharging work is facilitated.
[0033] The lower end of the plate seat of the first pressing plate 5 is provided with a first template A13, the upper end of the plate seat of the second pressing plate 6 is provided with a first template B14 opposite to the first template A13, the lower end of the plate seat of the second pressing plate 6 is provided with a second template A16, the upper end of the plate seat of the third pressing plate 7 is provided with a second template B17 opposite to the second template A16, the lower end of the plate seat of the third pressing plate 7 is provided with a third template A19, the upper end of the plate seat of the fourth pressing plate 8 is provided with a third template B20 opposite to the third template A19, and the support spring 11 supporting the fourth pressing plate 8 is arranged in the support of the lower base 1 in a two-by-two symmetrical form, when the first pressing plate 5, the second pressing plate 6, the third pressing plate 7 and the fourth pressing plate 8 are pressed against each other, the buffer spring 11 arranged in the support of the lower base 1 can integrally and elastically buffer and support the four groups of pressing plates, the impact strength of the overall structure of the four groups of pressing plates is reduced, and the elastic buffering protection function is achieved.
[0034] The lower base 1 and the upper pressing seat 2 are symmetrically provided with guide rails 9 at the front and rear ends of the supports, which are guided by the first pressing plate 5, the second pressing plate 6, the third pressing plate 7 and the fourth pressing plate 8. The guide rail frame of each set of guide rails 9 is provided with a track sliding groove 10. The front and rear ends of the base of the first pressing plate 5 are symmetrically provided with first guide sliding buckles 12 guided by the track sliding groove 10. The front and rear ends of the base of the second pressing plate 6 are symmetrically provided with second guide sliding buckles 15 guided by the track sliding groove 10. The front and rear ends of the base of the third pressing plate 7 are symmetrically provided with third guide sliding buckles 18 guided by the track sliding groove 10. The front and rear ends of the base of the fourth pressing plate 8 are symmetrically provided with fourth guide sliding buckles 21 guided by the track sliding groove 10. By sequentially arranging the first guide sliding buckles 12, the second guide sliding buckles 15, the third guide sliding buckles 18 and the fourth guide sliding buckles 21 on the first pressing plate 5, the second pressing plate 6, the third pressing plate 7 and the fourth pressing plate 8, which are matched with the track sliding groove 10 in the guide rail 9, the arm force guide rod 3 can play a lifting guide role together, ensuring the accuracy and guidance of the displacement of the four sets of pressing plates.
[0035] The inner part of the plate seat of the second pressing plate 6, the third pressing plate 7 and the fourth pressing plate 8 is respectively provided with a self-ejecting mechanism penetrating through the first mold plate B14, the second mold plate B17 and the third mold plate B20, the self-ejecting mechanism comprises an ejecting cavity 23 sequentially arranged in the inner part of the second pressing plate 6, the third pressing plate 7 and the fourth pressing plate 8, two groups of rotating bases 24 are symmetrically arranged in the cavity of the ejecting cavity 23, a rotating sleeve 25 is rotationally connected to the upper end of the rotating base 24 of each group, a lifting lead screw 26 is screwed in the inner part of the rotating sleeve 25, a lifting platform 27 penetrating through the first mold plate B14, the second mold plate B17 and the third mold plate B20 is arranged at the top end of the shaft of the lifting lead screw 26, a guide sliding seat 29 is arranged between the two groups of rotating bases 24, a transmission guide rod 30 is penetratingly connected in the inner part of the guide sliding seat 29, a tension spring 22 is arranged at one end of the arm of the transmission guide rod 30, an arm force pulling rope 28 is arranged at the other end of the arm of the transmission guide rod 30, the arm force pulling rope 28 is sequentially connected with the first pressing plate 5, the second pressing plate 6 and the third pressing plate 7 through the ejecting cavity 23, the transmission gear 31 is fixedly sleeved on the outer side of the shaft sleeve of the two groups of rotating sleeves 25, the transmission rack 32 meshing with the transmission gear 31 is arranged at both ends of the arm of the transmission guide rod 30, after the PRB filler is integrally extruded, when the four groups of pressing plates are expanded and opened, the distance between the two adjacent groups of pressing plates above and below is increased, the arm force pulling rope 28 is pulled out from the ejecting cavity 23, then the arm force pulling rope 28 is pulled out at the same time, the transmission guide rod 30 is stretched and slid, the transmission rack 32 on the arm of the transmission guide rod 30 is displaced and slid in the sliding process of the transmission guide rod 30, the tension is converted into rotary force by the meshing transmission of the transmission rack 32 and the transmission gear 31, the rotating sleeve 25 is driven to rotate, the lifting lead screw 26 is pushed out from the rotating sleeve 25 when the rotating sleeve 25 rotates, as a supporting driving force, the lifting platform 27 in the corresponding mold plate is pushed out, the multi-layer PRB filler after extrusion is pushed out from the lifting platform 27.
[0036] The bottom plate surface of the first mold plate B14, the second mold plate B17 and the third mold plate B20 is sequentially provided with a penetrating groove matched with the lifting platform 27, by arranging the self-ejecting mechanism corresponding to the lifting platform 27 at the bottom of the first mold plate B14, the second mold plate B17 and the third mold plate B20, the self-ejecting performance of the lifting platform 27 can be used to push out the PRB filler after extrusion, reduce the strength of the workers to take the material and improve the production efficiency.
[0037] The working principle of the present application is: when the PRB filler is molded by the molding die, the base material of the PRB filler is sequentially placed in the corresponding first template B14, second template B17 and third template B20, and then the first pressure plate 5, second pressure plate 6, third pressure plate 7 and fourth pressure plate 8 are pressed by the pressure equipment, so that the first template A13, second template A16 and third template A19 are sequentially pressed into the first template B14, second template B17 and third template B20, and the PRB base material in the three groups of templates is one-time extrusion molding, and after the PRB filler is co-extrusion molded, the elastic stretching of the four groups of pressure plates based on the return spring 4 keeps the first pressure plate 5, second pressure plate 6, third pressure plate 7 and fourth pressure plate 8 connected integrally, and then the four groups of pressure plates are expanded and opened by the lifting of the pressure equipment, so that the corresponding three groups of templates are opened, which is convenient for subsequent material taking and discharging work, and at the same time of expanding and opening the four groups of pressure plates, the interval between the two groups of pressure plates above and below becomes larger, so that the loose arm force pull rope 28 is tightened and a pulling force is generated on the arm force pull rope 28, the arm force pull rope 28 is pulled out of the material lifting cavity 23, and then the arm force pull rope 28 is pulled out, which drives the transmission guide rod 30 to stretch and slide, the transmission guide rod 30 drives the transmission rack 32 on the arm rod to slide during the sliding process, the transmission rack 32 and the transmission gear 31 are engaged and driven, the pulling force is converted into rotary force, the rotary silk sleeve 25 is pushed to start rotating, the lifting screw 26 is pushed out of the rotary silk sleeve 25 during the rotation of the rotary silk sleeve 25, which serves as a supporting driving force to push out the material lifting platform 27 in the corresponding template, the PRB filler after extrusion molding is lifted out, which is convenient for the workers to take the material directly, and after the material is taken, the four groups of pressure plates are controlled to be pressed and reset, so that the expansion interval is kept appropriate, then the arm force pull rope 28 is reset from the tight state to the loose state, the pulling force disappears, at the same time, the transmission guide rod 30 is kept in the reset state under the stretching reset of the stretching spring 22, generates a reverse driving force, and the combination of the lifting screw 26 and the material lifting platform 27 is reset, which is convenient for the next extrusion molding and material lifting work. The molding die of this type can perform extrusion molding work on multiple groups of PRB fillers at one time, which is convenient for mass production of PRB fillers, and the modularized PRB fillers replace the traditional PRB reaction wall formed by filling, which is convenient for building PRB reaction wall by filling the modularized PRB fillers one by one, and the operation is safe, simple and convenient, and the modularization precision is high.
[0038] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can make equivalent replacement or change within the technical range disclosed by the present application according to the technical solution and inventive concept of the present application, which should be covered within the protection scope of the present application.
Claims
1. A multi-in-one preparation jig based on a modular PRB reaction wall, characterized in that, Including lower base (1) and install on the upper side of lower base (1) upper pressure seat (2), lower base (1) and upper pressure seat (2) between through install on its corner end arm force guide rod (3) fixed connection; The arm rod outside of arm force guide rod (3) is sequentially sleeved with first pressing plate (5), second pressing plate (6), third pressing plate (7) and fourth pressing plate (8) from top to bottom, and first pressing plate (5), second pressing plate (6), third pressing plate (7) and fourth pressing plate (8) between adjacent are sequentially connected through reset spring (4) that is sleeved on the arm rod outside of arm force guide rod (3). The lower end of the base of first pressing plate (5) is provided with first die plate A (13), the upper end of the base of second pressing plate (6) is provided with first die plate B (14) opposite to first die plate A (13), the lower end of the base of second pressing plate (6) is provided with second die plate A (16), the upper end of the base of third pressing plate (7) is provided with second die plate B (17) opposite to second die plate A (16), and the lower end of the base of third pressing plate (7) is provided with third die plate A (19), and the upper end of the base of fourth pressing plate (8) is provided with third die plate B (20) opposite to third die plate A (19). The inner part of the base of second pressing plate (6), third pressing plate (7) and fourth pressing plate (8) is respectively provided with a self-ejecting mechanism penetrating first die plate B (14), second die plate B (17) and third die plate B (20). The self-ejecting mechanism comprises an ejecting cavity (23) sequentially formed in the inner part of the base of second pressing plate (6), third pressing plate (7) and fourth pressing plate (8), two groups of rotating bases (24) are symmetrically arranged in the cavity of the ejecting cavity (23), a rotating wire sleeve (25) is rotatably connected to the upper end of each rotating base (24), a lifting screw rod (26) is screwed in the core sleeve of the rotating wire sleeve (25), an ejecting platform (27) penetrating first die plate B (14), second die plate B (17) and third die plate B (20) is arranged at the top end of the shaft of the lifting screw rod (26), a guide sliding seat (29) is arranged between the two groups of rotating bases (24) in the cavity of the ejecting cavity (23), a transmission guide rod (30) is connected in the base of the guide sliding seat (29), a stretching spring (22) is arranged at one end of the arm of the transmission guide rod (30), an arm force pulling rope (28) is arranged at the other end of the arm of the transmission guide rod (30), and the arm force pulling rope (28) is sequentially connected with the first pressing plate (5), second pressing plate (6) and third pressing plate (7) penetrating the ejecting cavity (23). The outer side of the shaft sleeve of the two groups of rotating wire sleeves (25) is fixedly sleeved with a transmission gear (31), and the two ends of the arm of the transmission guide rod (30) are provided with a transmission rack (32) engaged with the transmission gear (31).
2. The all-in-one preparation tool based on the modular PRB reaction wall according to claim 1, wherein, The reset spring (4) and the arm force guide rod (3) are slidably sleeved, and the first pressing plate (5), second pressing plate (6), third pressing plate (7) and fourth pressing plate (8) are sequentially connected by the elastic sliding of the reset spring (4) and the arm force guide rod (3).
3. The all-in-one preparation tool based on the modular PRB reaction wall according to claim 1, wherein, The support inside of the lower base (1) is provided with buffer springs (11) supporting the fourth pressing plate (8) in a two-by-two symmetrical manner.
4. The all-in-one preparation tool based on the modular PRB reaction wall according to claim 1, wherein, The lower base (1) and the upper pressing seat (2) are provided with guide rails (9) guiding the first pressing plate (5), the second pressing plate (6), the third pressing plate (7) and the fourth pressing plate (8) in a two-by-two symmetrical manner at the front and rear ends of the supports, and the guide rail frames of each group of guide rails (9) are provided with track sliding grooves (10).
5. The all-in-one preparation tool based on the modular PRB reaction wall according to claim 4, wherein, The front and rear ends of the plate seat of the first pressing plate (5) are provided with first guide sliding buckles (12) guiding the track sliding grooves (10) in a two-by-two symmetrical manner. The front and rear ends of the plate seat of the second pressing plate (6) are provided with second guide sliding buckles (15) guiding the track sliding grooves (10) in a two-by-two symmetrical manner. The front and rear ends of the plate seat of the third pressing plate (7) are provided with third guide sliding buckles (18) guiding the track sliding grooves (10) in a two-by-two symmetrical manner. The front and rear ends of the plate seat of the fourth pressing plate (8) are provided with fourth guide sliding buckles (21) guiding the track sliding grooves (10) in a two-by-two symmetrical manner.
6. The all-in-one preparation tool based on the modular PRB reaction wall according to claim 1, wherein, The bottom plate surfaces of the first template B (14), the second template B (17) and the third template B (20) are provided with through grooves opposite to the material lifting platform (27) in sequence.
Citation Information
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