Concrete aggregate conveying equipment

Abstract

The invention relates to concrete aggregate conveying equipment, and relates to the technical field of concrete processing, the concrete aggregate conveying equipment comprises a conveying belt and a supporting assembly used for supporting the conveying belt, and the supporting assembly comprises an obliquely-arranged support, supporting rollers fixedly arranged at the two ends of the support and a plurality of supporting rods symmetrically and fixedly arranged on the lower side of the support; the support is fixedly provided with a driving piece for driving the supporting roller at the upper end to rotate, and guide sliding grooves are formed in the two opposite sides of the support in the length direction of the support. A protection assembly is arranged above the conveying belt and comprises a plurality of bearing frames arranged in the guide sliding grooves in a sliding mode, flexible protection covers fixedly connected with the outer surfaces of the bearing frames and locking pieces used for fixing the bearing frames. According to the aggregate conveying equipment, when the aggregate conveying equipment is applied in windy weather, a worker firstly slidably mounts the bearing frame on the support, then the mounting position of the bearing frame is locked through the locking piece, the upper portion of the conveying belt can be protected in the unfolding state, and the influence of the windy weather on aggregate conveying is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of concrete processing, and in particular to a concrete aggregate conveying device. Background Art

[0002] Concrete aggregate conveying equipment plays a vital role in concrete mixing plants and construction sites. Its core task is to efficiently and accurately transfer aggregates (such as cement, sand and other key ingredients) from storage silos to mixers or other processing equipment to ensure the smooth progress of concrete production and construction processes. With the booming construction industry and the acceleration of technological iterations, concrete aggregate conveying equipment is undergoing continuous innovation and optimization to achieve more efficient and environmentally friendly production and construction goals.

[0003] In the existing technical system, especially in small construction sites, belt conveyors have become the mainstream choice for concrete aggregate transportation due to their simple structure, convenient operation and strong conveying capacity. This type of equipment uses the friction and tension on the conveyor belt to effectively transport aggregates from the source to the destination, greatly improving construction efficiency.

[0004] However, in practical applications, we also have to face some challenges. Especially in windy weather conditions, lightweight aggregates such as cement and sand are very likely to generate dust during transportation, which not only poses a threat to the air quality at the construction site and affects the respiratory health of construction workers, but may also lead to serious waste of raw materials and increase construction costs. More seriously, long-term exposure to dust environments may also have an adverse effect on the performance and service life of construction equipment, and there is room for improvement. Summary of the invention

[0005] The purpose of this application is to provide a concrete aggregate conveying equipment to solve the problem that when the above-mentioned conveying equipment is used in windy weather, dust is easily generated during the conveying process, resulting in waste of raw materials and affecting the health of construction workers.

[0006] The concrete aggregate conveying equipment provided in this application adopts the following technical solution: A concrete aggregate conveying device comprises an inclined conveyor belt and a support assembly for supporting the conveyor belt, wherein the support assembly comprises an inclined bracket, support rollers fixed at both ends of the bracket, and a plurality of support rods symmetrically fixed at the lower side of the bracket; a driving member for driving the upper support roller to rotate is fixed on the bracket, and guide grooves are provided on opposite sides of the bracket along its own length direction; a protective assembly is provided above the conveyor belt, and the protective assembly comprises a plurality of receiving frames slidably arranged in the guide grooves, a flexible protective cover fixedly connected to the outer surface of the receiving frame, and a locking member for fixing the receiving frame; the flexible protective cover can be adjusted to an expanded state as the receiving frame slides, and can protect the upper part of the conveyor belt in the expanded state.

[0007] By adopting the above technical solution, when the aggregate conveying equipment is used in windy weather, due to the installation setting of the protective component, the staff first slides the receiving frame onto the bracket, and then the flexible protective cover can be adjusted to the unfolded state as the receiving frame slides, and finally the installation position of the receiving frame is locked using a locking piece, so that the conveyor belt can be protected in the unfolded state, reducing the impact of windy weather on aggregate transportation.

[0008] Optionally, a plurality of guide rollers inserted into the guide slot are arranged side by side on the side of the lower portion of the receiving frame facing the guide slot.

[0009] By adopting the above technical solution, due to the installation arrangement of the guide roller, it is convenient for the receiving frame to slide back and forth along the length direction of the guide slide groove, thereby improving the stability and smoothness of the receiving frame during sliding adjustment.

[0010] Optionally, the locking member includes a locking rod with one end hinged to the lower portion of the receiving frame, and the other end of the locking rod is detachably connected to the outer peripheral surface of the support rod.

[0011] By adopting the above technical solution, due to the application setting of the locking rod, the user can drive the receiving frame to slide by pulling the locking rod, and the user can also fix the installation position of the receiving frame by locking the lower end of the locking rod, thereby improving the corresponding usage performance.

[0012] Optionally, a locking through hole is provided on the end of the locking rod away from the receiving frame, a locking screw hole that can overlap with the locking through hole is provided on the support rod, and a locking bolt that penetrates the locking through hole and is screwed into the lower part of the bracket.

[0013] By adopting the above technical solution, when locking the lower end of the locking rod, the locking through hole is overlapped with the locking screw hole, and then the locking bolt is passed through the locking through hole and screwed into the corresponding locking screw hole, so that the lower end of the locking rod can be locked, and then the installation position of the receiving frame can be locked.

[0014] Optionally, positioning rods are slidably arranged in the vertical direction on two side surfaces that are relatively far away from the support rods, and elastic reset parts are provided on the outer periphery of the support rods to drive the positioning rods to slide upward; the lower end of the locking rod can abut against the upper end of the positioning rod in a fixed state, so that the positioning rod slides downward as a whole until the positioning rod is flush with the lower end of the support rod.

[0015] By adopting the above technical solution, due to the combined arrangement of the positioning rod and the elastic reset member, when the locking rod is in a fixed state, the lower end of the locking rod is adjusted along the guide slope to a state of abutment against the upper end of the positioning rod, and the positioning rod can slide downward as a whole to squeeze the elastic reset member until the positioning rod and the lower end of the support rod are in a flush position; when the protective assembly is not installed, the locking rod and the positioning rod are misaligned, and this is because the elastic reset member drives the positioning rod to move upward, and at this time there is a gap between the lower end of the positioning rod and the ground.

[0016] Optionally, a limit block is fixedly provided on the outer periphery of the support rod, and a limit through hole is opened on the limit block for the positioning rod to pass through. The elastic reset component includes a reset compression spring in a compressed state and a baffle fixedly provided above the limit block, and both ends of the reset compression spring are fixedly connected to the sides of the baffle and the limit block that are close to each other.

[0017] By adopting the above technical solution, due to the combined arrangement of the reset spring and the baffle, when the locking rod abuts against the upper end of the positioning rod, the reset spring is compressed; when the locking rod and the positioning rod are misaligned, the reset spring is reset and squeezes the baffle to move the positioning rod upward as a whole, thereby facilitating the automatic reset of the positioning rod.

[0018] Optionally, a guiding slope is provided on the edge of the upper end of the positioning rod, an elastic clamping piece is provided on the lower end surface of the locking rod, and a positioning groove is provided on the upper end surface of the positioning rod for the elastic clamping piece to be clamped into.

[0019] By adopting the above technical solution, during the fixing process of the locking rod, the lower end of the locking rod is adjusted along the guide slope to abut against the upper end of the positioning rod, so that the elastic clip is inserted into the positioning groove. Through the combination of the elastic clip and the positioning groove, the installation of the locking rod in this state is further improved.

[0020] Optionally, a scraper located below the conveyor belt is fixedly provided on the adjacent sides of the two opposing support rods, and one side of the scraper abuts against the lower side of the conveyor belt; a flexible collecting curtain for collecting scraped impurities is provided below the scraper.

[0021] By adopting the above technical solution, during the operation of the conveyor belt, the upper edge of the scraper abuts against the lower side of the conveyor belt, thereby scraping off impurities adhering to the surface of the conveyor belt, and collecting the impurities through a flexible collecting curtain, which is convenient for subsequent centralized processing or recycling and reuse.

[0022] Optionally, fixed blocks are slidably provided in the vertical direction on the sides close to each other relative to the support rods, a hook is fixedly provided on the edge of the flexible collecting curtain, and a hanging ring for the hook to be inserted into is fixedly provided on the fixed block; a traction piece is provided on the positioning rod, and when the positioning rod slides downward, the fixed block is driven upward by the traction piece.

[0023] By adopting the above technical solution, in windy weather, the receiving frame is slidably installed on the bracket, and the locking rod is fixed on the support rod at the corresponding position, so that the positioning rod slides downward as a whole, and when the positioning rod moves downward, the flexible collecting curtain will move upward as a whole, thereby reducing the distance between the flexible collecting curtain and the conveyor belt, reducing the possibility of impurities scraped by the scraper being scattered into the air in windy weather, and improving the efficiency of collecting impurities.

[0024] Optionally, the traction member includes a traction wheel rotatably arranged on the vertical side of the support rod and a traction rope wound around the traction wheel, the traction wheel is located above the fixed block, an extension rod is fixedly provided on the outer surface of the positioning rod, and the two ends of the traction rope are respectively fixedly connected to the upper side of the fixed block and the end of the extension rod.

[0025] By adopting the above technical solution, due to the combined setting of the traction wheel and the traction rope, when the positioning rod moves downward, the traction rope pulls the fixed block to slide upward, thereby increasing the installation height of the hanging ring and further increasing the overall height of the flexible collecting curtain; and when the positioning rod slides upward, the fixed block moves downward by its own gravity.

[0026] In summary, this application includes the following beneficial technical effects: When the aggregate conveying equipment is used in windy weather, the staff first slides the receiving frame onto the bracket, and then the flexible protective cover can be adjusted to the unfolded state as the receiving frame slides. Finally, the installation position of the receiving frame is locked using a locking piece, so that the conveyor belt can be protected in the unfolded state, reducing the impact of windy weather on aggregate transportation. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application; Figure 2 It is a partial cross-sectional structural schematic diagram of the installation and coordination of the protection component in the embodiment of the present application; Figure 3It is a structural diagram showing the installation distribution of the receiving frame and the flexible protective cover in an embodiment of the present application; Figure 4 It is a partial structural diagram of the installation and matching of the elastic reset member in the embodiment of the present application; Figure 5 It is a partial cross-sectional structural schematic diagram of the embodiment of the present application embodying the installation and cooperation of the locking member; Figure 6 yes Figure 5 A magnified schematic diagram of part A; Figure 7 This is a schematic diagram of the structure of the scraper installation distribution in the embodiment of the present application; Figure 8 It is a partial structural diagram of the installation and coordination of the traction member and the flexible collecting curtain according to an embodiment of the present application.

[0029] In the figure, 1, conveyor belt; 2, supporting assembly; 21, bracket; 211, guide slide; 22, supporting roller; 23, support rod; 231, limit block; 2311, limit through hole; 24, driving member; 25, scraper; 3, protection assembly; 31, receiving frame; 311, guide roller; 32, flexible protective cover; 33, locking member; 331, locking rod; 3311, placement groove; 332, locking bolt; 34, elastic clamping member; 341, spring; 342, arc-shaped protrusion; 4, positioning rod; 41, guide slope; 42, extension rod; 43, positioning groove; 5, elastic reset member; 51, reset compression spring; 52, baffle; 6, fixing block; 61, hanging ring; 7, flexible collecting curtain; 71, hook; 8, traction member; 81, traction wheel; 82, traction rope. DETAILED DESCRIPTION

[0030] The present application is further described in detail below in conjunction with all the accompanying drawings.

[0031] Example: Reference Figure 1 A concrete aggregate conveying device comprises an inclined conveyor belt 1, a support assembly 2 for supporting the conveyor belt 1, wherein the support assembly 2 comprises an inclined bracket 21, two support rollers 22 fixed at both ends of the bracket 21, and three groups of support rods 23 symmetrically fixed on the lower side of the bracket 21, each group of support rods 23 has two support rods, and the two support rods 23 are symmetrically fixed on the bracket 21, and the heights of the three groups of support rods 23 decrease gradually; The bracket 21 is provided with a driving member 24 for driving the upper support roller 22 to rotate. The driving member 24 is a conventional motor. When the driving member 24 is in operation, it drives the support roller 22 to rotate, thereby driving the conveyor belt 1 to operate.

[0032] Reference Figure 2 and Figure 3, guide grooves 211 are provided on the two opposite sides of the bracket 21 along its length direction; a protection component 3 is provided above the conveyor belt 1, wherein the protection component 3 includes three groups of receiving frames 31 slidably arranged in the guide grooves 211, a flexible protection cover 32 fixedly connected to the outer surface of the receiving frame 31, and a locking member 33 for fixing the receiving frame 31; When the aggregate conveying equipment is used in windy weather, the receiving frame 31 is slidably installed on the bracket 21, and then the flexible protective cover 32 can be adjusted to the unfolded state as the receiving frame 31 slides, and can protect the conveyor belt 1 in the unfolded state, thereby reducing the impact of windy weather on aggregate transportation.

[0033] Reference Figure 3 Two guide rollers 311 inserted into the guide groove 211 are arranged side by side on the side of the lower part of the receiving frame 31 facing the guide groove 211, which facilitates the sliding adjustment of the receiving frame 31, improves the subsequent disassembly and assembly efficiency of the protective component 3, and improves the corresponding use performance.

[0034] Reference Figure 2 and Figure 4 The locking member 33 includes a locking rod 331 with one end hinged to the lower part of the receiving frame 31, a locking through hole is provided on the end of the locking rod 331 away from the receiving frame 31, and a locking screw hole that can overlap with the locking through hole is provided on the support rod 23, and a locking bolt 332 is provided below the bracket 21 and penetrates the locking through hole and is screwed into, so as to realize the detachable connection between the lower end of the locking rod 331 and the outer peripheral surface of the support rod 23; A positioning rod 4 is slidably arranged on the sides of the two opposing support rods 23 that are away from each other in the vertical direction. The length of the positioning rod 4 is adaptively adjusted according to the height of the support rod 23, and an elastic reset member 5 is arranged on the outer periphery of the support rod 23 to drive the positioning rod 4 to slide upward; a guiding inclined surface 41 is arranged on the edge of the upper end of the positioning rod 4; When the locking rod 331 is in a fixed state, the lower end of the locking rod 331 is adjusted along the guide slope 41 to abut against the upper end of the positioning rod 4, and the positioning rod 4 can slide downward as a whole until the positioning rod 4 is in a flush position with the lower end of the support rod 23.

[0035] Reference Figure 4 A limit block 231 is fixedly provided on the outer periphery of the support rod 23, wherein the limit block 231 is provided with a limit through hole 2311 for the positioning rod 4 to pass through, and the elastic reset member 5 includes a reset spring 51 in a compressed state and a baffle 52 fixedly provided above the limit block 231, and both ends of the reset spring 51 are fixedly connected to the side surfaces of the baffle 52 and the limit block 231 that are close to each other.

[0036] Reference Figure 5 and Figure 6The lower end surface of the locking rod 331 is provided with an elastic clamping member 34, wherein the elastic clamping member 34 includes a spring 341 and an arc-shaped protrusion 342. The lower end surface of the locking rod 331 is provided with a placement groove 3311 for the compression spring and the arc-shaped protrusion 342 to be placed. The spring 341 presses one side of the arc-shaped protrusion 342 so that a part of the arc-shaped protrusion 342 protrudes out of the placement groove 3311, and the outer side surface of the protruding part of the arc-shaped protrusion 342 is an arc surface, and the arc length corresponding to the arc surface is a minor arc; The upper end surface of the positioning rod 4 is provided with a positioning groove 43 for the protruding part of the arc-shaped protrusion 342 to be inserted into; when the lower end surface of the locking rod 331 abuts against the upper end surface of the positioning rod 4, the protruding part of the arc-shaped protrusion 342 is inserted into the positioning groove 43, thereby further locking the locking rod 331 and improving the installation stability of the locking rod 331.

[0037] Reference Figure 7 The scrapers 25 located below the conveyor belt 1 are installed on the sides of the two opposing support rods 23 by screws. The number of the scrapers 25 is three, which is the same as the number of groups of support rods 23, and the upper edge of the scrapers 25 abuts against the lower side of the conveyor belt 1 to scrape off the impurities adhering to the surface of the conveyor belt 1. A flexible collecting curtain 7 for collecting the scraped impurities is provided below the scrapers 25, which can collect the scraped impurities and make them slide down along the slope to the ground below the lowest point, thereby reducing the possibility that the scraped impurities are directly scattered on the ground and difficult to clean.

[0038] Reference Figure 7 and Figure 8 A fixing block 6 is slidably disposed on the sides of the two opposing supporting rods 23 that are close to each other in the vertical direction, a hook 71 is fixedly disposed on the edge of the flexible collecting curtain 7, and a hanging ring 61 is fixedly disposed on the fixing block 6 for the hook 71 to be inserted into; a traction member 8 is disposed on the positioning rod 4, and when the positioning rod 4 slides downward, the traction member 8 drives the fixing block 6 to move upward, and when the positioning rod 4 slides upward, the fixing block 6 moves downward by its own gravity. In other embodiments, an additional counterweight block may also be provided.

[0039] The traction member 8 includes a traction wheel 81 rotatably arranged on the vertical side surface of the support rod 23 and a traction rope 82 wound around the traction wheel 81, wherein the traction wheel 81 is located above the fixed block 6, and an extension rod 42 is fixedly arranged on the outer surface of the positioning rod 4, and the two ends of the traction rope 82 are respectively fixedly connected to the upper side surface of the fixed block 6 and the end of the extension rod 42; when the positioning rod 4 moves downward, the flexible collection curtain 7 moves upward as a whole, reducing the distance between the flexible collection curtain 7 and the conveyor belt 1; when the positioning rod 4 moves upward, the flexible collection curtain 7 moves downward as a whole, increasing the distance between the flexible collection curtain 7 and the conveyor belt 1.

[0040] In other embodiments, a bendable frame (copper wire, etc.) can be added to the inside of the flexible collecting curtain 7 to form a downward groove (not shown in the figure) along the length direction of the flexible collecting curtain 7, so as to better reduce the impurities collected on the flexible collecting curtain 7 from spilling out from the edge; in addition, a collection box (not shown in the figure) can be installed below the lowest point of the flexible collecting curtain 7 to better collect impurities on the flexible collecting curtain 7.

[0041] The implementation principle of the embodiment of the present application is: In windy weather, the receiving frame 31 is slidably mounted on the bracket 21, and the receiving frame 31 can be quickly driven to slide and adjust by the locking rod 331, and then the flexible protective cover 32 can be adjusted to the unfolded state along with the sliding of the receiving frame 31, and then the locking rod 331 is fixed to the support rod 23 at the corresponding position; During the fixing process of the locking rod 331, the lower end of the locking rod 331 is adjusted along the guide slope 41 to abut against the upper end of the positioning rod 4, so that the protruding part of the arc-shaped protrusion 342 is inserted into the positioning groove 43, and at the same time, the positioning rod 4 slides downward as a whole until the positioning rod 4 and the lower end of the support rod 23 are in a flush position; and when the positioning rod 4 moves downward, the flexible collecting curtain 7 will move upward as a whole, thereby reducing the distance between the flexible collecting curtain 7 and the conveyor belt 1.

[0042] Unless otherwise defined, the terms or scientific terms used in this application should be understood by people with ordinary skills in the field to which this application belongs. The "first", "second", "third" and similar words used in this application do not indicate any order, quantity or importance, but are only used to distinguish different components. "One" or "one" and other similar words do not indicate a quantitative limit, but indicate that there is at least one. "Including" or "comprising" and other similar words mean that the elements or objects appearing in front of "including" or "comprising" cover the elements or objects listed after "including" or "comprising" and their equivalents, and do not exclude other elements or objects. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0043] The embodiments of this specific implementation are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. The same components are represented by the same figure marks. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A concrete aggregate conveying device, comprising an inclined conveyor belt (1), a support assembly (2) for supporting the conveyor belt (1), the support assembly (2) comprising an inclined bracket (21), support rollers (22) fixedly mounted at both ends of the bracket (21), and a plurality of support rods (23) symmetrically fixedly mounted on the lower side of the bracket (21); a driving member (24) for driving the upper support roller (22) to rotate is fixedly mounted on the bracket (21), and guide grooves (211) are provided on opposite sides of the bracket (21) along its length direction; It is characterized in that A protective assembly (3) is provided above the conveyor belt (1), and the protective assembly (3) comprises a plurality of receiving frames (31) slidably arranged in the guide groove (211), a flexible protective cover (32) fixedly connected to the outer surface of the receiving frame (31), and a locking member (33) for fixing the receiving frame (31); the flexible protective cover (32) can be adjusted to an unfolded state as the receiving frame (31) slides, and can protect the upper part of the conveyor belt (1) in the unfolded state.

2. A concrete aggregate conveying equipment according to claim 1, characterized in that: A plurality of guide rollers (311) inserted into the guide slide groove (211) are arranged side by side on the side surface of the lower part of the receiving frame (31) facing the guide slide groove (211).

3. The concrete aggregate conveying equipment according to claim 1, characterized in that: The locking member (33) comprises a locking rod (331) having one end hinged to the lower part of the receiving frame (31), and the other end of the locking rod (331) is detachably connected to the outer peripheral surface of the support rod (23).

4. A concrete aggregate conveying equipment according to claim 3, characterized in that: A locking through hole is provided on the end of the locking rod (331) away from the receiving frame (31), a locking screw hole that can overlap with the locking through hole is provided on the support rod (23), and a locking bolt (332) is provided below the bracket (21) and passes through the locking through hole and is screwed into the locking through hole.

5. The concrete aggregate conveying equipment according to claim 3, characterized in that: Positioning rods (4) are slidably arranged in the vertical direction on two side surfaces which are away from each other relative to the support rod (23); and elastic reset members (5) are arranged on the outer periphery of the support rod (23) to drive the positioning rod (4) to slide upwards; The lower end of the locking rod (331) can abut against the upper end of the positioning rod (4) in a fixed state, so that the positioning rod (4) slides downward as a whole until the positioning rod (4) is flush with the lower end of the support rod (23).

6. The concrete aggregate conveying equipment according to claim 5, characterized in that: A limit block (231) is fixedly arranged on the outer periphery of the support rod (23), and a limit through hole (2311) is provided on the limit block (231) for the positioning rod (4) to pass through. The elastic reset member (5) comprises a reset compression spring (51) in a compressed state and a baffle (52) fixedly arranged above the limit block (231), and two ends of the reset compression spring (51) are fixedly connected to the side surfaces of the baffle (52) and the limit block (231) that are close to each other.

7. The concrete aggregate conveying equipment according to claim 5, characterized in that: The upper end edge of the positioning rod (4) is provided with a guiding inclined surface (41), the lower end surface of the locking rod (331) is provided with an elastic clamping piece (34), and the upper end surface of the positioning rod (4) is provided with a positioning groove (43) for the elastic clamping piece (34) to be clamped.

8. The concrete aggregate conveying equipment according to claim 5, characterized in that: A scraper (25) located below the conveyor belt (1) is fixedly provided on the adjacent sides of the two opposing support rods (23), and one side of the scraper (25) abuts against the lower side of the conveyor belt (1); a flexible collecting curtain (7) for collecting scraped impurities is provided below the scraper (25).

9. The concrete aggregate conveying equipment according to claim 8, characterized in that: A fixing block (6) is slidably provided on two sides close to each other relative to the support rod (23) in a vertical direction; a hook (71) is fixedly provided on the edge of the flexible collecting curtain (7); and a hanging ring (61) for the hook (71) to be clamped is fixedly provided on the fixing block (6); and a traction member (8) is provided on the positioning rod (4); when the positioning rod (4) slides downward, the fixing block (6) is driven to move upward through the traction member (8).

10. The concrete aggregate conveying equipment according to claim 9, characterized in that: The traction member (8) comprises a traction wheel (81) rotatably arranged on a vertical side surface of a support rod (23) and a traction rope (82) wound around the traction wheel (81); the traction wheel (81) is located above a fixed block (6); an extension rod (42) is fixedly arranged on the outer side surface of the positioning rod (4); and two ends of the traction rope (82) are respectively fixedly connected to the upper side surface of the fixed block (6) and the end of the extension rod (42).

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