A metering device for preventing rapid cooling of asphalt

Abstract

The present invention belongs to the technical field of asphalt metering equipment, and is particularly a metering device for preventing rapid cooling of asphalt, comprising a workbench and an outer cylinder, a weighing scale and a feeding structure respectively mounted on the workbench, a weighing barrel being placed on the upper end of the weighing scale, an inner cylinder being fixedly mounted on the inner bottom wall of the outer cylinder, a resistance wire being mounted on the inner wall of the outer cylinder for heating the asphalt inside the inner cylinder, and a stirring assembly being mounted inside the outer cylinder for uniformly heating the asphalt inside the inner cylinder; the present invention enables the asphalt inside the inner cylinder to be heated more uniformly through the precisely designed stirring assembly. Driven by a rotating rod, the stirring member penetrates deeply into the asphalt for full stirring, effectively avoiding the problem of uneven heat distribution; this uniform heating method not only improves the heating efficiency of the asphalt, but also significantly reduces the negative impact on the accuracy of later weighing caused by uneven heat, ensuring the accuracy and consistency of asphalt processing.

Description

Technical Field

[0001] The present invention relates to the technical field of asphalt metering equipment, and in particular to a metering device that prevents asphalt from cooling rapidly. Background Technology

[0002] In the field of asphalt material processing and application, ensuring uniform heating, accurate weighing and effective insulation of asphalt is a key link to improve product quality and meet engineering application requirements. However, existing asphalt processing equipment still has obvious limitations and shortcomings when dealing with these technical challenges.

[0003] Chinese patent publication number CN111323105B discloses "An Anti-Cooling Asphalt Metering Device". Its technical solution includes a base, the top of the base is fixedly connected to a support column, the top of the support column is fixedly connected to a workbench, the top of the workbench is fixedly installed with a support frame, the top of the workbench is fixedly connected to a circular groove seat, and the inner bottom wall of the circular groove seat is movably connected to an outer cylinder.

[0004] The anti-cooling asphalt metering device heats the inner cylinder filled with asphalt through a resistance wire, thereby heating the asphalt inside the inner cylinder to prevent the asphalt from cooling. The telescopic cylinder works to move the piston rod downward and drive the extrusion plate to move downward together, so that the asphalt inside the inner cylinder is squeezed from the outlet on the left side of the inner cylinder into the L-shaped tube and into the liquid storage barrel along the L-shaped tube, thereby increasing the pressure of the liquid storage barrel on the weighing sensor, so that the asphalt can be measured. However, there is still the problem of inaccurate weighing as a whole. The specific problems are as follows:

[0005] First, during the asphalt heating process, this non-uniform heating not only affects the physical properties and chemical stability of the asphalt, but may also cause errors in the asphalt weighing process, thereby affecting the quality and safety of subsequent construction. Secondly, the problem of residual asphalt dripping from the inner wall of the discharge port has always been a technical pain point in the industry; during the asphalt weighing process, if there is asphalt remaining on the inner wall of the discharge port, after the weighing is completed, these residual asphalt may continue to drip, resulting in inaccurate weighing results. This not only affects the precise measurement of asphalt, but may also cause pollution to the equipment and increase maintenance costs.

[0006] Finally, the thermal insulation problem of asphalt is also one of the key issues that need to be solved urgently by existing technologies. Before weighing asphalt, it is necessary to ensure that the asphalt is in an appropriate temperature range to maintain its physical properties and chemical stability. However, its thermal insulation measures use a heating device, which has limited thermal insulation effect and cannot meet the temperature stability requirements of high-precision asphalt processing. Especially in cold or harsh environments, the thermal insulation problem of asphalt is more prominent, which can easily lead to rapid cooling of asphalt, thereby affecting the weighing accuracy and construction quality. For this reason, we provide a metering device that prevents asphalt from cooling rapidly. Summary of the Invention

[0007] To solve the above problems, the present invention proposes a metering device for preventing the rapid cooling of asphalt, which more precisely solves the problems raised in the above-mentioned background technology.

[0008] The present invention is achieved through the following technical solutions:

[0009] The invention proposes a metering device for preventing the rapid cooling of asphalt, including a workbench, an outer cylinder, a weighing scale and a feeding structure respectively installed on the workbench. A weighing bucket is placed on the upper end of the weighing scale. An inner cylinder is fixedly installed on the inner bottom wall of the outer cylinder. A resistance wire is installed on the inner wall of the outer cylinder for heating the asphalt inside the inner cylinder. A stirring assembly is installed inside the outer cylinder for evenly heating the asphalt inside the inner cylinder; an anti-cooling component is connected between the outer cylinder and the inner cylinder;

[0010] The feeding structure includes a conveying box fixedly installed between the workbench and the outer cylinder. A shaft rotating rod is rotatably connected inside the conveying box through a bearing. A spiral conveying blade is fixedly connected to the periphery of the shaft rotating rod. A servo motor is fixedly installed at one end of the conveying box, and the output end of the servo motor is fixedly connected to one end of the shaft rotating rod. A feed inlet is formed through the outer cylinder, the inner cylinder and the conveying box for guiding asphalt into the inside of the conveying box. A discharge port is formed through the workbench and the conveying box for the asphalt to fall into the inside of the weighing bucket; a blocking mechanism is connected to the lower surface of the upper table board above the workbench to prevent the residual asphalt on the inner wall of the discharge port from dripping;

[0011] The stirring assembly includes a fixing plate fixedly installed on the inner wall of the outer cylinder. The fixing plate is rotatably connected to a first rotating rod through a bearing. A stirring member is fixedly installed on the periphery of the lower end of the first rotating rod for stirring and making the asphalt heat more evenly. The first rotating rod and the stirring member are both designed to be inside the inner cylinder. A first driving assembly is connected between the shaft rotating rod and the first rotating rod.

[0012] Further, the anti-cooling component includes a steel disc slidably connected to the inner wall of the inner cylinder for preventing the rapid cooling caused by the asphalt contacting the outside too much. The steel disc is slidably sleeved on the periphery of the first rotating rod. A feed hopper is connected through the upper surface of the steel disc for adding asphalt; a steel wire rope is fixedly installed on the upper surface of the steel disc for the synchronous lifting of the steel disc. U-shaped mounting seats are fixedly welded on the upper port surface of the inner cylinder and the inner wall of the upper port of the outer cylinder. The U-shaped mounting seats are rotatably connected to a fixed pulley through a rotating shaft. A mounting plate is fixedly welded on the outer wall of the outer cylinder, and the mounting plate is rotatably connected to a second rotating rod through a bearing. A winding disc is fixedly installed on the periphery of the second rotating rod for winding and unwinding the steel wire rope; a second driving assembly is connected between the shaft rotating rod and the second rotating rod.

[0013] Further, the blocking mechanism includes a strip-shaped placement groove formed on the lower surface of the upper platen above the workbench. A fixing rod is fixedly connected between the two end walls of the strip-shaped placement groove. A first spring is sleeved around the fixing rod. A moving sleeve block is slidably sleeved around the fixing rod. A blocking plate is fixedly connected to the lower surface of the moving sleeve block. A limiting structure for restricting the reset of the blocking plate is connected to the lower surface of the upper platen;

[0014] The limiting structure includes a U-shaped snap plate fixedly connected to the lower surface of the upper platen above the workbench. An L-shaped limiting stop rod is inserted into the inner wall of the U-shaped snap plate. One side of the end of the L-shaped limiting stop rod contacts the side of the blocking plate and restricts the reset of the blocking plate. A reciprocating mechanism is connected between the workbench and the L-shaped limiting stop rod; A pushing component is connected between the steel disc and the L-shaped limiting stop rod.

[0015] Further, the reciprocating mechanism includes a fixing block fixedly welded to the lower surface of the upper platen above the workbench and a strip-shaped through groove formed on the side of the L-shaped limiting stop rod. A cross fixing rod is fixedly connected between the two end walls of the strip-shaped through groove. A second spring is sleeved around the cross fixing rod. A sliding sleeve block is slidably sleeved around the cross fixing rod. The side of the sliding sleeve block is fixedly connected to the side of the fixing block.

[0016] Further, a guiding sliding through groove is formed on the surface of the upper platen above the workbench. A trapezoidal block is fixedly installed above one end of the L-shaped limiting stop rod. The trapezoidal block passes through the guiding sliding through groove;

[0017] The pushing component includes an n-shaped connecting rod fixedly connected to the upper surface of the steel disc. An n-shaped frame rod is fixedly connected to the end of the n-shaped connecting rod. A pushing block is fixedly welded to the end of the n-shaped frame rod. The pushing block touches the inclined surface of the trapezoidal block to push the horizontal movement of the trapezoidal block, so as to realize the movement of the L-shaped limiting stop rod and no longer restrict the reset of the blocking plate.

[0018] Further, the first driving component includes a worm gear fixedly installed on the outer periphery of the upper end of the first rotating rod and a worm rotatably connected to the outer cylinder through a bearing. The worm is meshed with the worm gear. A single-groove pulley is fixedly connected to one end of the worm. A single-groove pulley is fixedly installed on the outer periphery of the rotating shaft. A first linkage belt is wound around the outer peripheries of the single-groove pulley and the single-groove pulley.

[0019] Further, the second driving component includes a double-groove pulley fixedly installed at one end of the second rotating rod and a double-groove pulley fixedly installed on the outer periphery of the rotating shaft. A second linkage belt is wound around the outer peripheries of the double-groove pulley and the double-groove pulley.

[0020] Furthermore, a pulling rod is fixedly connected to one side surface of the blocking plate, which is used for pulling and unfolding the two blocking plates in the later stage. A rectangular through groove is provided on the surface of the upper plate of the workbench. A sealed cleaning door is installed on the periphery of one end of the conveying box body, which is used for the spiral conveying blades to reverse and clean the excess asphalt inside the conveying box body. The rectangular through groove is designed to be directly below the sealed cleaning door.

[0021] Furthermore, one end of the spring 1 is fixedly connected to the end wall of the strip-shaped placement groove, and the other end of the spring 1 is fixedly connected to one end surface of the moving sleeve block.

[0022] Furthermore, one end of the second spring is fixedly connected to the end wall of the strip-shaped through slot, and the other end of the second spring is fixedly connected to one end surface of the sliding sleeve.

[0023] Beneficial effects of the present invention:

[0024] The present invention uses a precisely designed stirring assembly to heat the asphalt in the inner cylinder more evenly. Driven by the rotating rod, the stirring element penetrates deep into the asphalt to fully stir it, effectively avoiding the problem of uneven heat distribution; this uniform heating method not only improves the heating efficiency of the asphalt, but also significantly reduces the negative impact of uneven heat on the subsequent weighing accuracy, ensuring the accuracy and consistency of asphalt processing.

[0025] The present invention adopts the design of the blocking mechanism. When the asphalt needs to be discharged from the weighing barrel, the blocking plate is precisely opened under the control of the L-shaped limit lever to ensure the smooth flow of the asphalt; in the non-discharging state, the blocking plate fits tightly against the discharge port to effectively prevent the residual asphalt from dripping; this design not only avoids the waste of asphalt, but more importantly, eliminates the weighing error caused by dripping asphalt, thereby ensuring the accuracy and stability of the weighing.

[0026] The present invention greatly reduces the chance of direct contact between asphalt and external cold air by introducing anti-cooling components; the asphalt is effectively insulated during the heating process through the synergistic effect of the liftable steel plate and fixed pulley, winding disk and other components; this design not only reduces the performance loss of asphalt caused by rapid cooling, but also ensures the temperature stability of asphalt before weighing, which is crucial to improving the accuracy of weighing. Brief Description of the Figures

[0027] Figure 1 It is a first stereoscopic view of an embodiment of the present invention;

[0028] Figure 2 A second stereoscopic view of an embodiment of the present invention;

[0029] Figure 3 This is a third stereoscopic view of an embodiment of the present invention;

[0030] Figure 4 is a structural cross-sectional view of an embodiment of the present invention;

[0031] Figure 5 is a structural schematic diagram of a workbench plate in an embodiment of the present invention;

[0032] Figure 6 An embodiment of the present invention Figure 2 Enlarged view of the structure at A in the middle;

[0033] Figure 7 An embodiment of the present invention Figure 5 Enlarged view of the structure at B in the middle;

[0034] Figure 8 An embodiment of the present invention Figure 5 Enlarged view of the structure at C in the middle.

[0035] In the figure: 1. Workbench; 2. Outer cylinder; 3. Weighing scale; 4. Weighing barrel; 5. Inner cylinder; 6. Resistance wire; 7. Conveying box; 8. Shaft rotating rod; 9. Spiral conveying blade; 10. Servo motor; 11. Feeding port; 12. Discharging port; 13. Fixed plate; 14. Rotating rod 1; 15. Stirring element; 16. Worm gear; 17. Worm; 18. Single groove belt pulley 1; 19. Single groove belt pulley 2; 20. Linkage belt 1; 21. Steel plate; 22. Feed hopper; 23. Steel wire rope; 24. U-shaped mounting seat; 25. Fixed pulley; 26. Mounting plate; 27. Rotating rod 2; 28, winding disc; 29, double groove belt pulley 1; 30, double groove belt pulley 2; 31, linkage belt 2; 32, strip placement groove; 33, fixed rod; 34, spring 1; 35, moving sleeve block; 36, blocking plate; 37, U-shaped buckle plate; 38, L-shaped limit stopper rod; 39, fixed block; 40, strip through groove; 41, horizontal fixed rod; 42, spring 2; 43, sliding sleeve block; 44, guide slide through groove; 45, trapezoidal block; 46, n-type connecting rod; 47, n-type frame rod; 48, push block; 49, pull rod; 50, rectangular through groove; 51, sealed cleaning door. Specific implementation method

[0036] In order to more clearly and completely illustrate the technical solution of the present invention, the present invention is further described below in conjunction with the accompanying drawings.

[0037] If Figures 1-8As shown in the figure, a metering device for preventing rapid cooling of asphalt proposed in an embodiment of the present invention. The core components of this device include a workbench 1, on which an outer cylinder 2, a weighing scale 3, and a precise feeding structure are integrated. A weighing bucket 4 is provided on the top of the weighing scale 3 for accurately receiving asphalt. An inner cylinder 5 is nested inside the outer cylinder 2, and uniform heating is provided by the resistance wire 6 on the inner wall to ensure that the asphalt is maintained at an appropriate temperature. A specially designed stirring component is supported by a fixing plate 13 fixed on the inner wall of the outer cylinder 2 to rotate the first rotating rod 14 and the stirring piece 15, which extends into the inner cylinder 5 to achieve uniform stirring and heating of the asphalt. The feeding structure efficiently transports asphalt in the conveying box 7 through the spiral conveying blade 9 driven by the servo motor 10, enters through the feeding port 11, and precisely falls into the weighing bucket 4 through the discharging port 12. In addition, a blocking mechanism is ingeniously arranged above the workbench 1 to effectively prevent asphalt leakage.

[0038] Furthermore, the core of the anti-cooling component is the liftable steel plate 21, which is slidably installed inside the inner cylinder 5 and is connected to the fixed pulley 25 and the winding disc 28 through the steel wire rope 23. The winding disc 28 is driven by the second rotating rod 27 and is linked to the shaft rotating rod 8 through the second driving component. When asphalt is added to the steel plate 21 through the feeding hopper 22, the lifting of the steel plate 21 not only helps to uniformly heat the asphalt but also effectively isolates the outside cold air, preventing the asphalt from rapidly cooling; through the lifting of the steel plate 21 and the anti-cooling design, the heating efficiency and heat preservation performance of the asphalt are significantly improved.

[0039] Furthermore, the blocking mechanism consists of a strip-shaped placement groove 32, a fixed rod 33, a first spring 34, a moving sleeve block 35, a blocking plate 36, and a limiting structure. The limiting structure includes a U-shaped snap plate 37 and an L-shaped limiting stop rod 38, and the automatic movement and reset of the L-shaped limiting stop rod 38 are realized through a reciprocating mechanism. A specially designed touch-pushing component uses the lifting of the steel plate 21 to push the L-shaped limiting stop rod 38, thereby releasing the blocking plate 36 to allow the asphalt to flow out; the design of the blocking mechanism not only effectively prevents asphalt leakage but also improves the operation efficiency through automatic control.

[0040] Furthermore, the reciprocating mechanism consists of a fixed block 39, a strip-shaped through groove 40, a horizontal fixing rod 41, a second spring 42, and a sliding sleeve block 43. When the touch-pushing component pushes the L-shaped limiting stop rod 38, the second spring 42 and the horizontal fixing rod 41 act together to achieve the smooth reciprocating movement of the L-shaped limiting stop rod 38; the design of the reciprocating mechanism ensures the accurate movement and reset of the L-shaped limiting stop rod 38 and improves the reliability of the blocking mechanism.

[0041] Furthermore, a guide slide groove 44 is provided above the workbench 1, and a trapezoidal block 45 is installed at one end of the L-shaped limit stop bar 38. The push-touch assembly uses the n-shaped connecting rod 46, the n-shaped frame rod 47 and the push-touch block 48 to push the trapezoidal block 45 by the lifting and lowering of the steel plate 21, thereby driving the L-shaped limit stop bar 38 to move; the design of the push-touch assembly realizes the precise linkage between the lifting and lowering of the steel plate 21 and the movement of the L-shaped limit stop bar 38.

[0042] Furthermore, the driving component 1 is composed of a worm wheel 16, a worm 17, a single groove belt pulley 18, a single groove belt pulley 2 19 and a linkage belt 20. The rotation of the shaft rotating rod 8 drives the rotating rod 14 and the stirring member 15 to rotate through the meshing of the worm 17 and the worm wheel 16 and the transmission of the linkage belt 20; the design of the driving component 1 realizes the efficient linkage between the shaft rotating rod 8 and the stirring component.

[0043] Furthermore, the driving component 2 is composed of a double groove belt pulley 1 29, a double groove belt pulley 2 30 and a linkage belt 2 31. The rotation of the shaft rotating rod 8 is transmitted through the double groove belt pulley 2 30 and the linkage belt 2 31, driving the rotating rod 2 27 and the winding disk 28 to rotate; the design of the driving component 2 realizes the close linkage between the shaft rotating rod 8 and the anti-cooling component.

[0044] Furthermore, a pull rod 49 is provided on one side of the blocking plate 36 to facilitate later operation and maintenance. A rectangular through slot 50 is provided above the workbench 1, and a sealed cleaning door 51 is provided at one end of the conveying box 7 to facilitate the cleaning of excess asphalt; these designs not only improve the practicability of the device, but also facilitate later maintenance and cleaning work.

[0045] Furthermore, spring 1 34 and spring 2 42 are respectively fixedly connected to the end walls of the strip-shaped placement groove 32 and the strip-shaped through groove 40, and one end surface of the moving sleeve 35 and the sliding sleeve 43. They provide stable elastic support for the reset of the blocking plate 36 and the L-shaped limit stopper 38; the design of the spring ensures the stable reset of the blocking mechanism and the limit structure, and improves the reliability and durability of the device.

[0046] The working principle of the present invention is as follows: when asphalt needs to be processed, asphalt is first added into the inner cylinder 5 through the feed hopper 22. At this time, the resistance wire 6 starts to work, heating the inner cylinder 5 and the asphalt inside it; at the same time, the servo motor 10 starts to drive the shaft rotating rod 8 to rotate. The rotation of the shaft rotating rod 8 is driven by the worm 17, the worm wheel 16, the single groove belt pulley 18, the single groove belt pulley 2 19 and the linkage belt 1 20 to drive the rotating rod 14 and the stirring member 15 thereon to rotate. The stirring member 15 rotates in the asphalt to achieve uniform stirring of the asphalt and ensure that the asphalt is heated evenly during the heating process; as the shaft rotating rod 8 continues to rotate, the spiral conveying blade 9 pushes the asphalt forward inside the conveying box 7. The asphalt enters the conveying box 7 through the feed port 11 and is conveyed to the discharge port 12 under the action of the spiral conveying blade 9; when the asphalt reaches the discharge port 12, since the blocking plate 36 is restricted by the L-shaped limit stop rod 38 and cannot be reset, the asphalt can be smoothly dropped into the weighing barrel 4 for weighing. When the asphalt in the inner cylinder 5 is introduced into the weighing barrel 4, and the steel plate 21 is lowered to the lowest position, the n-type connecting rod 46 drives the n-type frame rod 47 and the push block 48 to move downward, which will cause the push block 48 to push the trapezoidal block 45, so that the L-type limit stopper 38 moves, so that its end no longer limits the blocking plate 36. At the same time, the blocking plate 36 automatically resets under the action of the spring 1 34 to prevent asphalt from dripping; during the asphalt heating and transportation process, the steel plate 21 is lifted and lowered under the action of the wire rope 23, the fixed pulley 25 and the winding disk 28. The lifting of the steel plate 21 not only helps the uniform heating of the asphalt, but also effectively isolates the cold air from the outside to prevent the asphalt from cooling quickly; the lifting of the steel plate 21 is linked by the rotation of the drive component 2 and the shaft rotating rod 8. When the shaft rotating rod 8 rotates, the double groove belt pulley 2 30 and the linkage belt 2 31 drive the rotating rod 27 and the winding disk 28 to rotate, thereby driving the wire rope 23 and the steel disk 21 to rise and fall; when it is necessary to clean the excess asphalt inside the conveying box 7, the sealed cleaning door 51 can be opened, and the servo motor 10 can be used to reverse the spiral conveying blade 9 to discharge the excess asphalt from the conveying box 7; the pulling rod 49 on one side of the blocking plate 36 is convenient for manually pulling the blocking plate 36 during later operation and maintenance to ensure the smooth operation of the device. The design of the rectangular through slot 50 facilitates the collection and treatment of excess asphalt during the cleaning process.

[0047] Finally, it should be noted that: The basic concepts have been described above. Obviously, for those skilled in the art, the above detailed disclosure is only an example and does not constitute a limitation to this specification. Although not explicitly stated here, those skilled in the art may make various modifications, improvements, and corrections to this specification. Such modifications, improvements, and corrections are suggested in this specification, so such modifications, improvements, and corrections still fall within the spirit and scope of the exemplary embodiments of this specification. At the same time, this specification uses specific terms to describe the embodiments of this specification. Such as "one embodiment", "an embodiment", and / or "some embodiments" mean a certain feature, structure, or characteristic related to at least one embodiment of this specification. Therefore, it should be emphasized and noted that "an embodiment" or "one embodiment" or "an alternative embodiment" mentioned twice or more at different positions in this specification does not necessarily refer to the same embodiment. In addition, certain features, structures, or characteristics in one or more embodiments of this specification can be appropriately combined. In addition, unless clearly stated in the claims, the order of the processing elements and sequences described in this specification, the use of numerical letters, or the use of other names are not used to limit the order of the processes and methods in this specification.

Claims

1. A metering device for preventing rapid cooling of asphalt, comprising a workbench (1) and an outer cylinder (2), a weighing scale (3) and a feeding structure respectively mounted on the workbench (1), wherein a weighing bucket (4) is placed on the upper end of the weighing scale (3), an inner cylinder (5) is fixedly mounted on the inner bottom wall of the outer cylinder (2), and a resistance wire (6) is mounted on the inner wall of the outer cylinder (2) for heating the asphalt inside the inner cylinder (5), characterized in that: A stirring assembly is installed inside the outer cylinder (2) to allow the asphalt inside the inner cylinder (5) to be heated evenly; an anti-cooling component is connected between the outer cylinder (2) and the inner cylinder (5); The material conveying structure comprises a conveying box (7) fixedly mounted between a workbench (1) and an outer cylinder (2); the interior of the conveying box (7) is rotatably connected to a shaft rotating rod (8) via a bearing; the periphery of the shaft rotating rod (8) is fixedly connected to a spiral conveying blade (9); a servo motor (10) is fixedly mounted on one end of the conveying box (7); and the output end of the servo motor (10) is fixedly connected to one end of the shaft rotating rod (8); a feed port (11) is provided through the outer cylinder (2), the inner cylinder (5) and the conveying box (7) for introducing asphalt into the interior of the conveying box (7); a discharge port (12) is provided through the workbench (1) and the conveying box (7) for dropping asphalt into the interior of a weighing barrel (4); a blocking mechanism is connected to the lower end surface of a platen above the workbench (1) for preventing residual asphalt from dripping from the inner wall of the discharge port (12); The stirring assembly comprises a fixed plate (13) fixedly mounted on the inner wall of the outer cylinder (2), the fixed plate (13) being rotatably connected to a rotating rod (14) via a bearing, a stirring member (15) being fixedly mounted on the outer periphery of the lower end of the rotating rod (14) for stirring and allowing the asphalt to be heated more evenly, and the rotating rod (14) and the stirring member (15) are both located inside the inner cylinder (5), and a driving assembly (1) is connected between the shaft rotating rod (8) and the rotating rod (14); The anti-cooling component comprises a steel plate (21) slidably connected to the inner wall of the inner cylinder (5) for preventing the asphalt from being too exposed to the outside world and causing rapid cooling, and the steel plate (21) is slidably sleeved on the outer periphery of the rotating rod (14), and the upper end surface of the steel plate (21) is connected through a feed hopper (22) for filling asphalt; a steel wire rope (23) is fixedly installed on the upper end surface of the steel plate (21) for synchronous lifting of the steel plate (21); the upper end surface of the inner cylinder (5) and the outer cylinder (2 ) are fixedly welded to the inner wall of the upper port of each of the outer cylinders (2), and the U-shaped mounting seat (24) is rotatably connected to a fixed pulley (25) via a rotating shaft; a mounting plate (26) is fixedly welded to the outer wall of the outer cylinder (2), and the mounting plate (26) is rotatably connected to a second rotating rod (27) via a bearing; a winding drum (28) is fixedly mounted on the periphery of the second rotating rod (27) for winding and releasing the steel wire rope (23); a driving assembly 2 is connected between the shaft rotating rod (8) and the second rotating rod (27).

2. A metering device for preventing rapid cooling of asphalt according to claim 1, characterized in that: The blocking mechanism comprises a strip-shaped placement groove (32) provided on the lower end surface of the upper table plate of the workbench (1); a fixing rod (33) is fixedly connected between the two end walls of the strip-shaped placement groove (32); a spring (34) is sleeved on the outer periphery of the fixing rod (33); a movable sleeve block (35) is slidably sleeved on the outer periphery of the fixing rod (33); a blocking plate (36) is fixedly connected to the lower end surface of the movable sleeve block (35); and a limiting structure for limiting the resetting of the blocking plate (36) is connected to the lower end surface of the upper table plate; The limiting structure comprises a U-shaped snap plate (37) fixedly connected to the lower end surface of a table plate above the workbench (1); an L-shaped limiting stop rod (38) is inserted into the inner wall of the U-shaped snap plate (37); one end side edge of the L-shaped limiting stop rod (38) contacts the side edge of the blocking plate (36) and limits the resetting of the blocking plate (36); a reciprocating mechanism is connected between the workbench (1) and the L-shaped limiting stop rod (38); and a push-touch assembly is connected between the steel plate (21) and the L-shaped limiting stop rod (38).

3. A metering device for preventing rapid cooling of asphalt according to claim 2, characterized in that: The reciprocating mechanism comprises a fixed block (39) fixedly welded to the lower end surface of the table plate above the workbench (1) and a strip-shaped through groove (40) opened on the side of the L-shaped limit stop rod (38), a transverse fixing rod (41) is fixedly connected between the two end walls of the strip-shaped through groove (40), a spring 2 (42) is provided on the outer periphery of the transverse fixing rod (41), a sliding sleeve block (43) is slidably sleeved on the outer periphery of the transverse fixing rod (41), and the side of the sliding sleeve block (43) is fixedly connected to the side of the fixed block (39).

4. A metering device for preventing rapid cooling of asphalt according to claim 2, characterized in that: A guide slide groove (44) is provided on the surface of the upper table of the workbench (1), a trapezoidal block (45) is fixedly installed above one end of the L-shaped limit stop rod (38), and the trapezoidal block (45) passes through the guide slide groove (44); The push-touch assembly comprises an n-shaped connecting rod (46) fixedly connected to the upper end surface of the steel plate (21); the end of the n-shaped connecting rod (46) is fixedly connected to an n-shaped frame rod (47); the end of the n-shaped frame rod (47) is fixedly welded with a push-touch block (48); and the push-touch block (48) touches the inclined surface of the trapezoidal block (45) to push the trapezoidal block (45) to move horizontally, so that the movement of the L-shaped limit stop rod (38) no longer restricts the resetting of the blocking plate (36).

5. A metering device for preventing rapid cooling of asphalt according to claim 1, characterized in that: The driving assembly 1 comprises a worm wheel (16) fixedly mounted on the periphery of the upper end of a rotating rod 1 (14) and a worm (17) rotatably connected to the outer cylinder (2) via a bearing, and the worm (17) is meshingly connected to the worm wheel (16), one end of the worm (17) is fixedly connected to a single-groove belt pulley 1 (18), a single-groove belt pulley 2 (19) is fixedly mounted on the periphery of the shaft rotating rod (8), and a linkage belt 1 (20) is wound around the peripheries of the single-groove belt pulley 1 (18) and the single-groove belt pulley 2 (19).

6. A metering device for preventing rapid cooling of asphalt according to claim 1, characterized in that: The driving assembly 2 comprises a double-groove belt pulley 1 (29) fixedly mounted on one end of the rotating rod 2 (27) and a double-groove belt pulley 2 (30) fixedly mounted on the periphery of the shaft rotating rod (8), and a linkage belt 2 (31) is wound around the peripheries of the double-groove belt pulley 1 (29) and the double-groove belt pulley 2 (30).

7. A metering device for preventing rapid cooling of asphalt according to claim 2, characterized in that: A pulling rod (49) is fixedly connected to the surface of one side of the blocking plate (36) for pulling and unfolding the two blocking plates (36) at a later stage. A rectangular through groove (50) is provided on the surface of the upper platen of the workbench (1). A sealed cleaning door (51) is installed on the periphery of one end of the conveying box (7) for reversing the spiral conveying blades (9) and cleaning the excess asphalt inside the conveying box (7). The rectangular through groove (50) is designed to be located directly below the sealed cleaning door (51).

8. A metering device for preventing rapid cooling of asphalt according to claim 2, characterized in that: One end of the spring one (34) is fixedly connected to the end wall of the strip-shaped placement groove (32), and the other end of the spring one (34) is fixedly connected to one end surface of the moving sleeve block (35).

9. A metering device for preventing rapid cooling of asphalt according to claim 3, characterized in that: One end of the second spring (42) is fixedly connected to the end wall of the strip-shaped through groove (40), and the other end of the second spring (42) is fixedly connected to one end surface of the sliding sleeve block (43).

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