Polyethylene fiber concrete slab production device
By designing a slide and rake mechanism, and combining high-frequency and low-frequency vibrations, the problem of uneven distribution of polyethylene fibers in concrete slab production was solved, achieving uniform distribution of polyethylene fibers and improving the quality and production efficiency of concrete slabs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-02-12
- Publication Date
- 2026-04-07
AI Technical Summary
During the production of polyethylene fiber concrete slabs, the high-frequency vibration of the vibrating equipment causes uneven distribution of polyethylene fibers, affecting the quality of the concrete slabs.
The system employs a slide and rake mechanism, combined with high-frequency and low-frequency vibrations. The rake grabs the surface polyethylene fibers and scrapes them back to the bottom layer, while a bubble detector is used to achieve uniform distribution of the polyethylene fibers.
It improves the uniformity of polyethylene fibers in concrete, ensuring the quality and production efficiency of concrete slabs.
Smart Images
Figure CN121798735A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of concrete slab production, in particular to a polyethylene fiber concrete slab production device. BACKGROUND
[0002] High Ductility Cementitious Composites (HDC·C, also commonly known as Engineered Cementitious Composite, ECC) is a new type of polyethylene fiber reinforced cementitious composite material. The concrete slab made of it has an improved crack resistance of 30%-50% and an improved impact resistance of 2-3 times compared to traditional concrete slabs, and is lighter in weight, facilitating transportation and construction. It has a broad application prospect in prefabricated building, municipal road paving and underground engineering lining.
[0003] In the production of polyethylene fiber concrete slabs, the pouring step is a key quality control step. First, the uniformly mixed polyethylene fiber concrete slurry is injected into the shaped mold, and then the internal air bubbles of the slurry are removed and the aggregate is compacted with the help of a vibrating device to ensure the strength and density of the formed concrete slab. The core structure of the existing vibrating device includes a vibrating cylinder and a vibrator, the vibrator is built into the vibrating cylinder, and during operation, the vibrating cylinder is inserted into the concrete slurry, and high-frequency vibration is generated by the vibrator to drive the vibrating cylinder to vibrate synchronously, achieving the vibrating and compacting treatment of the surrounding concrete.
[0004] However, when using the above vibrating device to vibrate the polyethylene fiber concrete, the high-frequency vibration generated by the vibrating cylinder will drive the concrete slurry to produce a stratified flow effect. The aggregate in the polyethylene fiber concrete, which has a higher density, slowly sinks under the action of gravity, while the polyethylene fiber, which has a much lower density than the aggregate, will float upwards with the cement paste, causing the polyethylene fiber to slowly separate from the concrete, resulting in uneven distribution of polyethylene fiber in the concrete after vibration, thereby affecting the quality of the produced concrete slab. SUMMARY
[0005] The purpose of the present application is to overcome the problems in the prior art and provide a polyethylene fiber concrete slab production device that can improve the uniformity of the distribution of polyethylene fiber in the concrete during the pouring and vibrating of the concrete slab, thereby ensuring the quality of the produced concrete slab.
[0006] The present application provides a polyethylene fiber concrete slab production device, comprising a carriage and a vibrator, the carriage being arranged above a concrete slab pouring mold, and further comprising: The rake rod mechanism comprises a transmission shaft and a plurality of rake rods, the transmission shaft is horizontally arranged and rotationally connected with a sliding frame, the transmission shaft is connected with a first power device, the plurality of rake rods are arranged in parallel and distributed along the axial direction of the transmission shaft, and each of the rake rods is arranged along the radial direction of the transmission shaft. A vibrating cylinder is arranged outside the transmission shaft, the inner diameter of the vibrating cylinder is larger than the outer diameter of the transmission shaft, the vibrator is connected with the vibrating cylinder, the vibrating cylinder is used for vibrating the cast concrete, the side wall of the vibrating cylinder is provided with a plurality of sliding holes in the radial direction of the vibrating cylinder, each of the rake rods is slidingly connected in one of the sliding holes, the vibrating cylinder rotates with the rake rods during the rotation of the rake rods along with the transmission shaft, the vibrating cylinder is eccentric to the transmission shaft under the action of gravity when the rake rods are rotated to the vertical state, and the length of the top end of the rake rod protruding from the sliding hole is larger than the length of the bottom end of the rake rod protruding from the sliding hole.
[0007] Preferably, the first spring is arranged at each of the two ends of the rake rod, the first spring at each of the two ends of the rake rod is in abutment with the inner wall of the vibrating cylinder, the elastic forces applied by the first springs at the two ends of the rake rod to the inner wall of the vibrating cylinder are in opposite directions, and the length of the top end of the rake rod protruding from the sliding hole is larger than the length of the bottom end of the rake rod protruding from the sliding hole under the action of the elastic forces of the first springs at the two ends of the rake rod and the gravity of the vibrating cylinder when the rake rods are rotated to the vertical state.
[0008] Preferably, the transmission shaft is provided with a stepped hole in the radial direction of the transmission shaft, the middle part of the rake rod is rotationally connected with the small end of the stepped hole, a limiting stop ring is arranged on the rake rod, the limiting stop ring is in abutment with the stepped surface of the stepped hole, the limiting stop ring is used for limiting the radial movement of the rake rod along the transmission shaft, the outer wall of each of the two ends of the rake rod is provided with an external thread, each of the external threads is connected with a nut, the nut is slidingly connected with the large end of the stepped hole in the radial direction of the transmission shaft, the first spring at each of the two ends of the rake rod is in abutment with the nut at the two ends of the rake rod, and the rotation of the rake rod can adjust the pre-compression amount of the first springs at the two ends of the rake rod, so as to adjust the difference between the length of the top end of the rake rod protruding from the sliding hole and the length of the bottom end of the rake rod protruding from the sliding hole when the rake rod is in the vertical state.
[0009] Preferably, the vibrating cylinder is further provided with a cover plate at each of the two ends, the cover plate is provided with a through shaft hole in the axial direction of the transmission shaft, the cover plate is slidingly connected with the transmission shaft through the through shaft hole, a second spring is arranged outside the transmission shaft, the second spring is in abutment with the cover plate, and the second spring is used for applying an elastic force in the axial direction of the transmission shaft to the cover plate, so that the end part of the vibrating cylinder is tightly attached to the cover plate under the action of the elastic force of the second spring, thereby sealing the inner cavity of the vibrating cylinder.
[0010] Preferably, the slide is equipped with a bubble detector, which is used to detect the real-time overflow rate of bubbles on the concrete surface inside the mold. The slide is connected to the second power device, which is used to drive the slide to move horizontally above the mold. The bubble detector is electrically connected to a controller, which is also electrically connected to the second power device. The controller has a preset overflow rate threshold. When the real-time overflow rate is less than the real-time overflow rate threshold, the controller controls the second power device to drive the slide to move.
[0011] Preferably, the bubble detector includes a funnel and a flow rate sensor. The funnel is located at the upper end of the vibrating cylinder and is inverted. The larger end of the funnel is inserted into the concrete, and the smaller end of the funnel is connected to the flow rate sensor. The flow rate sensor is used to detect the airflow velocity at the smaller end of the funnel. The flow rate sensor is electrically connected to the controller, and the controller calculates the real-time overflow rate of bubbles on the concrete surface based on the airflow velocity at the smaller end of the funnel.
[0012] Preferably, when the rake bar rotates with the drive shaft to a vertical position, the length of the top of the rake bar protruding from the sliding hole is greater than one-sixth of the outer diameter of the vibrating cylinder.
[0013] Preferably, the inner wall of the vibrating cylinder is provided with reinforcing ribs, which are used to prevent the vibrating cylinder from bending.
[0014] Preferably, the outer wall of the rake bar is provided with a wear-resistant layer.
[0015] Preferably, the first power unit and the drive shaft are connected by a belt.
[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: In the polyethylene fiber concrete board production device of the present invention, the vibrating cylinder vibrates the concrete inside the mold, expelling internal air bubbles. Simultaneously, the first power device drives the transmission shaft to rotate, causing multiple rakes and the vibrating cylinder to rotate. Because the vibrating cylinder is slidably connected to the rakes through sliding holes, it generates low-frequency vibration under its own gravity, which, combined with the high-frequency vibration of the vibrator, accelerates the expulsion of air bubbles from the concrete. During concrete vibration, lightweight polyethylene fibers easily float. When the transmission shaft drives the rakes to a vertical position, the vibrating cylinder is at its lowest limit position due to gravity, and the top of the rake protrudes from the sliding hole and extends into the concrete surface. As the transmission shaft continues to rotate, the rakes move downwards, rakeing the surface polyethylene fibers to the bottom layer. The polyethylene fibers hang on the rakes, and at this time, the vibrating cylinder rotates and rises under the drive of the rakes, reaching its highest position when the rakes are horizontal. Subsequently, the rakes continue to rotate, and the vibrating cylinder descends accordingly. When the rake bar rotates 180 degrees, the end of the rake bar with polyethylene fibers is at its lowest position. The vibrating cylinder moves downwards, scraping the polyethylene fibers off the rake bar and allowing the surface polyethylene fibers to return to the bottom layer. This ultimately improves the uniformity of polyethylene fiber distribution in the concrete and ensures the quality of the concrete slab.
[0017] When the first vibrating cylinder vibrates, the first spring acts as a buffer, preventing hard contact between the vibrating cylinder and the drive shaft, thus preventing damage to the drive shaft from the vibration of the vibrating cylinder and ensuring the normal operation of the entire device. Furthermore, when the rake bar is in a vertical position, the elastic force of the two first springs, combined with gravity, precisely controls the difference in protruding length between the two ends of the rake bar, ensuring that the top of the rake bar can stably grasp the surface polyethylene fibers. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of the structure of the first embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of the second embodiment of the present invention; Figure 3 For the present invention Figure 2 Schematic diagram of the structure of surface AA; Figure 4 For the present invention Figure 2 Schematic diagram of the structure of the middle BB surface; Figure 5 For the present invention Figure 2 Schematic diagram of the structure of the C-plane; Figure 6 This is a schematic diagram of the cover plate of the present invention.
[0019] Explanation of reference numerals in the attached figures: 1. Mold; 101. Carriage; 102. Vibrator; 103. Drive shaft; 104. Rake rod; 105. First power unit; 106. Vibrating cylinder; 107. Sliding hole; 2. First spring; 301. Nut; 302. Stepped hole; 303. Limiting ring; 401. Cover plate; 402. Second spring; 501. Bubble detector; 502. Second power unit; 601. Funnel; 602. Flow sensor; 7. Reinforcing rib; 8. Belt; 9. Elastic sealing ring. Detailed Implementation
[0020] The following is in conjunction with the appendix Figures 1-6 The specific embodiments of the present invention will be described in detail below, but it should be understood that the scope of protection of the present invention is not limited to the specific embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.
[0021] like Figures 1-6As shown, the present invention provides a polyethylene fiber reinforced concrete board production apparatus, including a slide 101 and a vibrator 102. The slide 101 is disposed above the concrete board casting mold 1. It also includes a rake mechanism and a vibrating cylinder 106. The rake mechanism includes a drive shaft 103 and multiple rakes 104. The drive shaft 103 is horizontally arranged and rotatably connected to the slide 101. A first power device 105 is connected to the drive shaft 103. The multiple rakes 104 are arranged in parallel and distributed axially along the drive shaft 103. The multiple rakes 104 are used to rake the polyethylene fibers inside the mold 1. Each rake 104 is arranged radially along the drive shaft 103. The vibrating cylinder 106 is disposed on the drive shaft 103. 3. In addition, the inner diameter of the vibrating cylinder 106 is larger than the outer diameter of the drive shaft 103. The vibrator 102 is connected to the vibrating cylinder 106. The vibrating cylinder 106 is used to vibrate the poured concrete. The side wall of the vibrating cylinder 106 is provided with a plurality of sliding holes 107 along the radial direction of the vibrating cylinder 106. Each rake rod 104 is slidably connected in a sliding hole 107. When the rake rod 104 rotates with the drive shaft 103, the vibrating cylinder 106 rotates together with the rake rod 104. When the rake rod 104 rotates to a vertical position, the vibrating cylinder 106 is eccentric to the drive shaft 103 under the action of gravity. The length of the top end of the rake rod 104 protruding from the sliding hole 107 is greater than the length of the bottom end of the rake rod 104 protruding from the sliding hole 107.
[0022] The working principle of the above embodiments is briefly described below: The device has an elastic sealing ring 9 inside the sliding hole 107. The outer wall of the rake rod 104 fits tightly with the elastic sealing ring 9. The elastic sealing ring 9 has a certain elasticity, which can seal the gap between the sliding hole 107 and the rake rod 104 while ensuring that the rake rod 104 slides smoothly in the sliding hole 107, thereby preventing concrete slurry from entering the sliding hole 107 and clogging it. In use, the slide frame 101 is installed on the mold 1 of the concrete slab, concrete mixed with polyethylene fiber is poured into the mold 1, and the vibrating cylinder 106 is inserted into the concrete. Then, the vibrator 102 is turned on, and the vibrator 102 generates high-frequency vibration, which drives the vibrating cylinder 106 connected to it to vibrate at high frequency. The vibrating cylinder 106 will vibrate the concrete in the mold 1, thereby dislodging air bubbles in the concrete. Then, the first power device 105 is controlled to operate, and the first power device 105 drives the transmission shaft 103 to rotate, thereby driving the multiple rakes 104 on it to rotate. The multiple rakes 104 drive the vibrating cylinder 106 to rotate. Since the vibrating cylinder 106 is slidably connected to the rakes 104 through the sliding hole 107, when the rakes 104 drive the vibrating cylinder 106 to rotate, the vibrating cylinder 106 will vibrate at a low frequency under its own gravity, thereby playing a role in homogenizing the concrete. Combined with the high-frequency vibration along the radial direction of the rakes 104 generated by the vibrator 102, it can accelerate the discharge of air bubbles in the concrete. During the vibration of the vibrating cylinder 106, the lightweight polyethylene fibers in the concrete slowly rise. When the drive shaft 103 drives multiple rakes 104 to a vertical position, the vibrating cylinder 106 is at its lowest limit position under its own weight. The top of the rakes 104 protrudes from the sliding hole 107 and extends into the surface of the concrete. As the drive shaft 103 rotates, it drives the multiple rakes 104 downward, thereby rakeing some of the polyethylene fibers from the concrete surface to the bottom layer. The polyethylene fibers will hang on the rakes 104. At this time, driven by the multiple rakes 104, the vibrating cylinder 106 rotates and moves upward. When the multiple rakes 104 rotate to a horizontal position, the vibrating cylinder 106 rises to its highest position. As the multiple rakes 104 continue to rotate, the vibrating cylinder 106 moves downward under its own gravity. When the multiple rakes 104 rotate 180 degrees and return to a vertical position, the end of the rake 104 with polyethylene fibers hanging on it is at its lowest position. At this time, as the vibrating cylinder 106 moves downward, because the length of the top end of the rake 104 protruding from the sliding hole 107 is greater than the length of the bottom end of the rake 104 protruding from the sliding hole 107, the outer wall of the vibrating cylinder 106 scrapes off a portion of the polyethylene fibers hanging on the rakes 104. This causes a portion of the polyethylene fibers on the surface of the concrete to return to the bottom layer of the concrete, thereby inhibiting the segregation of polyethylene fibers during vibration, improving the uniformity of polyethylene fiber distribution in the concrete, and ensuring the quality of the produced concrete slabs.
[0023] The polyethylene fiber concrete board production apparatus of the present invention can suppress the segregation of polyethylene fibers during concrete vibration, improve the uniformity of polyethylene fiber distribution in concrete, and ensure the quality of the produced concrete boards.
[0024] Based on the above embodiments, in order to prevent the vibration of the vibrating cylinder 106 from damaging the transmission shaft 103 and to ensure the normal operation of the entire device.
[0025] like Figure 2 , Figure 4 and Figure 6 As shown, each end of the rake rod 104 is provided with a first spring 2. The first spring 2 at both ends of each rake rod 104 abuts against the inner wall of the vibrating cylinder 106. The elastic forces applied by the first spring 2 at both ends of the rake rod 104 to the inner wall of the vibrating cylinder 106 are in opposite directions. When the rake rod 104 rotates with the transmission shaft 103 to a vertical state, under the action of the elastic force of the first spring 2 at both ends of the rake rod 104 and the weight of the vibrating cylinder 106 itself, the length of the top end of the rake rod 104 protruding from the sliding hole 107 is greater than the length of the bottom end protruding from the sliding hole 107.
[0026] Since the high-frequency vibration generated by the vibrator 102 is along the length of the rake 104, and the first spring 2 is located on the rake 104 and abuts against the inner wall of the vibrating cylinder 106, the first spring 2 can play a buffering role when the first vibrating cylinder 106 vibrates, thereby preventing the vibrating cylinder 106 from making hard contact with the drive shaft 103, thus preventing the vibration of the vibrating cylinder 106 from damaging the drive shaft 103, ensuring the normal operation of the entire device. When the rake 104 is in a vertical state, the elastic force of the two first springs 2 is superimposed with the gravity, accurately controlling the difference in the protruding lengths at both ends of the rake 104, ensuring that the top of the rake 104 can stably grasp the surface polyethylene fiber.
[0027] As a preferred option, such as Figure 6As shown, the drive shaft 103 has a stepped hole 302 along its own radial direction. The middle part of the rake rod 104 is rotatably connected to the small end of the stepped hole 302. The rake rod 104 is provided with a limiting ring 303, which abuts against the stepped surface of the stepped hole 302. The limiting ring 303 is used to restrict the rake rod 104 from moving radially along the drive shaft 103. Both ends of the rake rod 104 are provided with external threads, and each section of the external thread is connected to a nut 301. The nut 301 is slidably connected to the large end of the stepped hole 302 along the radial direction of the drive shaft 103. The first springs 2 at both ends of the rake rod 104 abut against the nuts 301 at both ends of the rake rod 104. Rotating the rake rod 104 can adjust the pre-compression of the first springs 2 at both ends of the rake rod 104, thereby adjusting the difference between the length of the top protrusion and the length of the bottom protrusion when the rake rod 104 is in a vertical state. When the rake handle 104 is rotated, the threaded drive causes the nuts 301 at both ends to move axially along the rake handle 104, thereby adjusting the pre-compression of the first springs 2 at both ends of the rake handle 104. When the pre-compression of the first springs 2 at both ends of the rake handle 104 increases, the spring elasticity increases, and the downward distance of the vibrating cylinder 106 caused by gravity decreases when the rake handle 104 is in a vertical state, thus reducing the difference in protruding length between the top and bottom ends of the rake handle 104. Conversely, when the pre-compression decreases, the length difference increases. The larger the length difference, the greater the disturbance of the rake handle 104 to the concrete matrix and the greater the amount of polyethylene fiber it grasps; conversely, the smaller the length difference, the less the disturbance of the rake handle 104 to the concrete matrix and the less the amount of polyethylene fiber it grasps. During operation, the pre-compression of the first spring 2 can be flexibly adjusted according to the thickness of the concrete pouring, the amount of polyethylene fiber, and the degree of floating. This precisely matches the polyethylene fiber gripping requirements of different production conditions, avoiding excessive disturbance to the concrete matrix due to excessive protrusion length difference, or insufficient gripping of polyethylene fiber due to insufficient protrusion length difference. This achieves precise control over the uniform distribution of polyethylene fiber and further improves the consistency of concrete slab quality.
[0028] As a preferred option, such as Figure 2 , Figure 3 and Figure 6As shown, the vibrating cylinder 106 is provided with cover plates 401 at both ends. The cover plates 401 are provided with through holes along the axial direction of the drive shaft 103. The cover plates 401 are slidably connected to the drive shaft 103 through the through holes. The drive shaft 103 is provided with a second spring 402. The second spring 402 abuts against the cover plates 401. The second spring 402 is used to apply an elastic force along the axial direction of the drive shaft 103 to the cover plates 401. Under the action of the elastic force of the second spring 402, the cover plates 401 are tightly fitted to the ends of the vibrating cylinder 106, thereby sealing the inner cavity of the vibrating cylinder 106. By setting the cover plate 401, since the second spring 402 abuts against the cover plate 401, under the action of the elastic force of the second spring 402, it can ensure that the cover plate 401 is always tightly fitted to the end of the vibrating cylinder 106 when the vibrating cylinder 106 moves relative to the drive shaft 103 and the cover plate 401, thereby sealing the inner cavity of the vibrating cylinder 106 and preventing concrete from entering the inner cavity of the vibrating cylinder 106 and hindering the movement of the vibrating cylinder 106 relative to the drive shaft 103, thus ensuring that the entire device can function normally.
[0029] As a preferred option, such as Figure 2 and Figure 4 As shown, the slide 101 is equipped with a bubble detector 501, which is used to detect the real-time overflow rate of air bubbles on the concrete surface inside the mold 1. The slide 101 is connected to the second power device 502, which drives the slide 101 to move horizontally above the mold 1. The bubble detector 501 is electrically connected to a controller, which is also electrically connected to the second power device 502. The controller has a preset overflow rate threshold. When the real-time overflow rate is less than the overflow rate threshold, the controller controls the second power device 502 to drive the slide 101 to rotate. While the vibrating cylinder 106 is vibrating the concrete, the bubble detector 501 detects the real-time overflow rate of air bubbles on the concrete surface. When the real-time overflow rate is greater than the preset threshold, it indicates that there are many air bubbles in the concrete. At this time, the second power device 502 stops driving the slide 101, and the vibrating cylinder 106 continues to vibrate the concrete at that location. As the vibrating cylinder 106 continues to vibrate, the number of air bubbles in the concrete gradually decreases. During vibration, the rate at which air bubbles overflow gradually decreases until the real-time overflow rate of air bubbles in the concrete is less than the overflow rate threshold, indicating that the air bubble content of the concrete at this point is qualified. At this time, the controller controls the second power device 502 to drive the slide 101 to move, thereby driving the vibrating cylinder 106 to vibrate the next section of concrete. This avoids excessive vibration that could lead to agglomeration of polyethylene fibers or segregation of concrete, achieving an adaptive balance between defoaming and fiber uniformity, and improving production efficiency and product quality.
[0030] As a preferred option, such as Figure 2 and Figure 4As shown, the bubble detector 501 includes a funnel 601 and a flow rate sensor 602. The funnel 601 is located at the upper end of the vibrating cylinder 106, and is inverted with its large opening inserted into the concrete. The small opening of the funnel 601 is connected to the flow rate sensor 602, which detects the airflow velocity at the small opening of the funnel 601. The flow rate sensor 602 is electrically connected to the controller, which calculates the real-time overflow rate of bubbles on the concrete surface based on the airflow velocity at the small opening of the funnel 601. Rising bubbles in the concrete converge at the large opening of the funnel 601 and are discharged through the small opening to form airflow. The flow rate sensor 602 detects the airflow velocity in real time and transmits it to the controller. The airflow velocity represents the overflow rate of bubbles in the concrete, providing accurate data support for subsequent control of the rotational speed of the first power device 105. Compared to traditional surface inspection, the inverted funnel 601 avoids interference from external airflow and accurately captures the overflow of air bubbles from the concrete surface. The flow rate sensor 602 has high detection sensitivity, ensuring the accuracy of intelligent control and further guaranteeing the thoroughness of defoaming and the uniform distribution of polyethylene fibers.
[0031] As a preferred option, such as Figure 1 , Figure 2 and Figure 6 As shown, when the rake rod 104 rotates with the drive shaft 103 to a vertical position, the length of the top end of the rake rod 104 protruding from the sliding hole 107 is greater than one-sixth of the outer diameter of the vibrating cylinder 106. This proportional design ensures that the top end of the rake rod 104 accurately grasps the polyethylene fibers that float and gather due to buoyancy, avoiding the omission of polyethylene fibers due to insufficient protrusion length, which would exacerbate the segregation phenomenon.
[0032] As a preferred option, such as Figure 2 and Figure 6 As shown, the inner wall of the vibrating cylinder 106 is provided with reinforcing ribs 7, which are used to prevent the vibrating cylinder 106 from bending. The vibrating cylinder 106 simultaneously bears the high-frequency vibration of the vibrator 102 and the centrifugal force of the revolution motion, which is prone to bending deformation. The reinforcing ribs 7 can effectively disperse stress, improve the overall rigidity and deformation resistance of the vibrating cylinder 106, avoid the bending of the cylinder wall and the displacement of the sliding hole 107 caused by long-term high-frequency operation, and ensure smooth sliding of the rake rod 104 and uniform vibration transmission.
[0033] As a preferred option, such as Figure 1 , Figure 2 and Figure 6As shown, the outer wall of the rake handle 104 is provided with a wear-resistant layer. The rake handle 104 needs to continuously rotate and slide in the concrete matrix, and at the same time, it will rub against the polyethylene fibers and aggregates. The wear-resistant layer can significantly improve the surface hardness and wear resistance of the rake handle 104, reduce friction loss, and prevent the diameter of the rake handle 104 from becoming smaller and the length from shortening due to long-term operation, which would affect the difference in length between the two ends and the gripping effect of the polyethylene fibers.
[0034] As a preferred option, such as Figure 1 , Figure 2 and Figure 5 As shown, the first power unit 105 and the drive shaft 103 are connected by a belt 8. The belt 8 drive has flexible buffering characteristics, which can effectively absorb the impact load during the start-up and operation of the first power unit 105, and avoid damage to components such as the drive shaft 103 and the rake 104 caused by rigid transmission.
[0035] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention.
Claims
1. A polyethylene fiber reinforced concrete board production apparatus, comprising a slide and a vibrator, wherein the slide is disposed above a concrete board casting mold, characterized in that, Also includes: The rake mechanism includes a drive shaft and multiple rakes. The drive shaft is horizontally arranged and rotatably connected to a carriage. The drive shaft is connected to a first power device. The multiple rakes are arranged in parallel and distributed along the drive shaft axially. The multiple rakes are used to rake polyethylene fibers in the mold. Each rake is arranged radially along the drive shaft. A vibrating cylinder is located outside the drive shaft. The inner diameter of the vibrating cylinder is larger than the outer diameter of the drive shaft. The vibrator is connected to the vibrating cylinder. The vibrating cylinder is used to vibrate the poured concrete. The side wall of the vibrating cylinder is provided with multiple sliding holes along the radial direction of the vibrating cylinder. Each rake rod is slidably connected in a sliding hole. When the rake rod rotates with the drive shaft, the vibrating cylinder rotates with the rake rod. When the rake rod rotates to a vertical position, the vibrating cylinder is eccentric to the drive shaft under the action of gravity. The length of the top end of the rake rod protruding from the sliding hole is greater than the length of the bottom end of the rake rod protruding from the sliding hole.
2. The polyethylene fiber concrete board production apparatus as described in claim 1, characterized in that, Each end of the rake bar is provided with a first spring. The first spring at both ends of each rake bar abuts against the inner wall of the vibrating cylinder. The elastic forces applied by the first springs at both ends of the rake bar to the inner wall of the vibrating cylinder are in opposite directions. When the rake bar rotates with the drive shaft to a vertical position, under the action of the elastic force of the first springs at both ends of the rake bar and the weight of the vibrating cylinder itself, the length of the top end of the rake bar protruding from the sliding hole is greater than the length of the bottom end protruding from the sliding hole.
3. The polyethylene fiber concrete board production apparatus as described in claim 2, characterized in that, The drive shaft has a stepped hole along its own radial direction. The middle part of the rake rod is rotatably connected to the small end of the stepped hole. A limiting retaining ring is provided on the rake rod. The limiting retaining ring abuts against the stepped surface of the stepped hole. The limiting retaining ring is used to restrict the movement of the rake rod along the radial direction of the drive shaft. Both ends of the rake rod have external threads on their outer walls. Each section of the external thread is connected to a nut. The nut is slidably connected to the large end of the stepped hole along the radial direction of the drive shaft. The first springs at both ends of the rake rod abut against the nuts at both ends of the rake rod. Rotating the rake rod can adjust the pre-compression of the first springs at both ends of the rake rod, thereby adjusting the difference between the length of the top protrusion and the length of the bottom protrusion when the rake rod is in a vertical state.
4. The polyethylene fiber reinforced concrete board production apparatus as described in claim 1, characterized in that, The vibrating cylinder is also provided with cover plates at both ends. The cover plates are provided with through holes along the axial direction of the drive shaft. The cover plates are slidably connected to the drive shaft through the through holes. A second spring is provided outside the drive shaft. The second spring abuts against the cover plate. The second spring is used to apply an elastic force along the axial direction of the drive shaft to the cover plate. Under the action of the elastic force of the second spring, the cover plate is tightly fitted to the end of the vibrating cylinder, thereby sealing the inner cavity of the vibrating cylinder.
5. The polyethylene fiber concrete board production apparatus as described in claim 1, characterized in that, The slide is equipped with a bubble detector, which is used to detect the real-time overflow rate of bubbles on the concrete surface inside the mold. The slide is connected to the second power device, which is used to drive the slide to move horizontally above the mold. The bubble detector is electrically connected to a controller, which is also electrically connected to the second power device. The controller has a preset overflow rate threshold. When the real-time overflow rate is less than the real-time overflow rate threshold, the controller controls the second power device to drive the slide to move.
6. The polyethylene fiber concrete board production apparatus as described in claim 5, characterized in that, The bubble detector includes a funnel and a flow rate sensor. The funnel is placed at the upper end of the vibrating cylinder and is inverted. The large end of the funnel is inserted into the concrete, and the small end of the funnel is connected to the flow rate sensor. The flow rate sensor is used to detect the airflow velocity at the small end of the funnel. The flow rate sensor is electrically connected to the controller, and the controller calculates the real-time overflow rate of bubbles on the concrete surface based on the airflow velocity at the small end of the funnel.
7. The polyethylene fiber concrete board production apparatus as described in claim 1, characterized in that, When the rake bar rotates with the drive shaft to a vertical position, the length of the top of the rake bar protruding from the sliding hole is greater than one-sixth of the outer diameter of the vibrating cylinder.
8. The polyethylene fiber concrete board production apparatus as described in claim 1, characterized in that, The inner wall of the vibrating cylinder is provided with reinforcing ribs, which are used to prevent the vibrating cylinder from bending.
9. The polyethylene fiber concrete board production apparatus as described in claim 1, characterized in that, The outer wall of the rake handle is provided with a wear-resistant layer.
10. The polyethylene fiber reinforced concrete board production apparatus as described in claim 1, characterized in that, The first power unit and the drive shaft are connected by a belt.