Tensioning assembly for foundry sand elevator and foundry sand elevator

Abstract

The invention provides a tensioning assembly for a foundry sand elevator and the foundry sand elevator, and belongs to the technical field of material conveying. The tensioning assembly comprises two box bodies, two moving seats, two bearing seats and a positive pressure air supply unit; the two box bodies are arranged on the two sides of the elevator in the axial direction of the conveying wheels correspondingly. The two moving seats are correspondingly arranged in the two box bodies respectively, and each moving seat is slidably connected with the corresponding box body in the vertical direction; each moving seat is in transmission connection with an adjusting mechanism; the two bearing seats are fixedly connected with the two movable seats respectively; the positive pressure air supply unit is arranged outside the elevator and used for conveying air with the air pressure higher than the external air pressure into the two box bodies so as to prevent dust from entering the box bodies. According to the tensioning assembly for the foundry sand elevator and the foundry sand elevator, foundry sand dust can be effectively prevented from entering the tensioning assembly, stable rotation of the bearing seat and the rotating shaft is guaranteed, the operation reliability of equipment is improved, and the service life of the equipment is prolonged.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of material conveying, and more particularly relates to a tensioning assembly for a foundry sand elevator and the foundry sand elevator. BACKGROUND

[0002] The foundry sand elevator is a key equipment of a foundry production line, and is used for conveying foundry sand from a low position to a high position sand treatment equipment. The core structure of the foundry sand elevator includes a head driving wheel, a tail driven wheel and a bucket conveyor belt surrounding the two wheels. The vertical or inclined conveying of sand is realized through the circular motion of the conveyor belt. The conveyor belt will elongate due to material fatigue and temperature change during long-term operation. The position of the tail driven wheel needs to be adjusted by the tensioning assembly to maintain the optimal tensioning degree, so as to avoid slipping or excessive tensioning.

[0003] The tensioning assembly of the existing foundry sand elevator usually adopts the following structure: the rotating shaft of the tail driven wheel is rotatably connected to the bearing seat at both ends, the bearing seat is fixed on a movable seat which can slide up and down along the box body, and the position of the movable seat is adjusted by a screw rod transmission mechanism. In order to prevent dust from entering, a labyrinth seal or a felt seal structure is usually used between the rotating shaft and the box body.

[0004] The tensioning assembly of the existing foundry sand elevator has the following deficiencies in sealing performance: the traditional labyrinth seal or felt seal is difficult to effectively block the fine sand powder in the foundry sand. During the operation of the elevator, the sand powder continuously invades the inside of the tensioning assembly and enters the meshing area of the bearing seat and the transmission gear. The invaded sand powder mixes with the lubricating oil in the bearing seat to form abrasive material, which causes serious wear on the bearing raceway and the gear tooth surface. Not only does this affect the normal operation of the parts, but it also increases the noise during the operation of the equipment. These problems result in a shorter service life of the parts of the existing tensioning assembly, frequent shutdown for replacement of the sealing elements, bearings or gears, and significant increase in maintenance costs and losses caused by production interruption of the enterprise. SUMMARY

[0005] The purpose of the present application is to provide a tensioning assembly for a foundry sand elevator and the foundry sand elevator, so as to solve the technical problem that the tensioning assembly of the elevator is difficult to block the invasion of dust when conveying foundry sand containing a large amount of fine sand and powder.

[0006] To achieve the above-mentioned purpose, the technical solution adopted by the present application is as follows: A tensioning assembly for a foundry sand elevator is provided. The inside of the elevator is provided with two conveying wheels arranged side by side in the up-down direction. A conveying belt is mounted on the periphery of the two conveying wheels. The tensioning assembly is connected to the rotating shaft of the lower conveying wheel. The tensioning assembly comprises: Two box bodies are arranged on both sides of the elevator along the axial direction of the conveying wheel, and the rotating shaft penetrates into the two box bodies at both ends. Two moving seats are arranged in the two boxes respectively, and each moving seat is slidably connected with the corresponding box in the up-down direction; each moving seat is drivingly connected with an adjusting mechanism, which is used for adjusting the up-down position of the moving seat; Two bearing seats are fixedly connected with the two moving seats respectively, and the two bearing seats are rotatably connected with the two ends of the rotating shaft respectively; and A positive pressure air supply unit is arranged outside the elevator and communicates with the interiors of the two boxes; the positive pressure air supply unit is used for supplying gas with higher pressure than the external air pressure into the two boxes to prevent dust from entering the interiors of the two boxes.

[0007] In a possible implementation, the positive pressure air supply unit comprises: An air compressor arranged outside the elevator and used for generating positive pressure air flow; Two air pipes corresponding to the two boxes respectively, one end of each air pipe communicating with the corresponding box, and the other end of each air pipe being connected with the air outlet of the air compressor; and A filter fixedly connected with the air inlet of the air compressor and used for purifying the air sucked by the air compressor.

[0008] In a possible implementation, the adjusting mechanism comprises: A screw rod rotatably connected with the corresponding box and having an axial direction parallel to the up-down direction; the lower end of the screw rod has a coaxially arranged handle; and A driving seat fixedly connected with the corresponding moving seat and threadedly connected with the screw rod; When the screw rod is rotated, the driving seat is adapted to drive the moving seat to move upward or downward.

[0009] In a possible implementation, the lower end of the screw rod penetrates through the box to the outside of the box, and the handle is located outside the box; the outer part of the screw rod outside the box is sleeved with a bellows, the upper end of the bellows is fixedly connected with the lower side of the box, and the lower end of the bellows is slidably connected with the upper side of the handle.

[0010] In a possible implementation, the side of the box away from the elevator is provided with an inspection window; the inspection window is hingedly connected with the box, and a gap between the inspection window and the box is provided with a sealing strip.

[0011] In a possible implementation, a rotating sealing ring is arranged between the box and the rotating shaft.

[0012] In a possible implementation, the tensioning assembly further comprises: A dust collection mechanism is arranged on the inner bottom surface of the box body to absorb dust inside the box body.

[0013] In a possible implementation, the dust collection mechanism comprises: A dust collection box is fixedly arranged on the inner bottom surface of the box body; An electrostatic generator is arranged inside the dust collection box to intermittently generate static electricity to adsorb dust inside the box body; and A vibration member is arranged inside the dust collection box to generate mechanical vibration, and the vibration member is connected to the electrostatic generator; When the electrostatic generator generates static electricity, the vibration member is adapted to stop working; when the electrostatic generator stops working, the vibration member is adapted to transmit mechanical vibration to the electrostatic generator to shake off dust adsorbed on the electrostatic generator.

[0014] In a possible implementation, the lower end of the dust collection box is in communication with the outside of the box body, and the lower end of the dust collection box is connected with a dust discharge valve; by opening the dust discharge valve, dust inside the dust collection box can be discharged.

[0015] In the embodiment of the application, when the conveying belt is slack or excessively tensioned due to long-term use during the operation of the casting sand elevator, the adjusting mechanism drives the moving seat to slide up and down along the box body, the moving seat drives the bearing seat and the conveying wheel shaft rotationally connected thereto to move synchronously, so as to adjust the position of the lower conveying wheel to change the tension of the conveying belt; at the same time, the positive pressure air supply unit continuously supplies gas with a pressure higher than that of the outside to the inside of the two box bodies, so that a positive pressure environment is formed in the box bodies, and air flow seeps from the inside of the box bodies to the outside environment, effectively preventing fine sand powder in the casting sand from invading the inside of the box bodies through the gap between the shaft and the box body, thereby creating a dust-free safety zone in the inside of the box bodies.

[0016] Compared with the prior art, the tensioning assembly for the casting sand elevator provided in the embodiment of the application realizes precise dynamic adjustment of the tension of the conveying belt through the adjusting mechanism, effectively avoids the problems of slippage or excessive tension of the conveying belt, and ensures stable operation of the elevator; the positive pressure air supply unit replaces the traditional sealing structure, and fundamentally solves the problem of invasion of micron-level fine sand powder through the double protection of physical isolation and air curtain sealing, prevents the mixing of sand powder and lubricating oil to form a grinding paste, significantly reduces abrasive wear of the bearing raceway and gear tooth surface, reduces the equipment operation noise and failure rate, prolongs the service life of the parts, reduces the frequency of shutdown maintenance, and greatly reduces the maintenance cost and production loss of the enterprise.

[0017] The technical solution adopted in the application further provides a casting sand elevator comprising the tensioning assembly for the casting sand elevator proposed in any one of the preceding embodiments.

[0018] The beneficial effects of the foundry sand elevator provided in this embodiment are the same as those of the aforementioned tensioning components for foundry sand elevators, and will not be repeated here. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a three-dimensional structural schematic diagram of the tensioning assembly for a foundry sand elevator provided in an embodiment of the present invention; Figure 2 This is a front view structural schematic diagram of the tensioning assembly for a foundry sand elevator provided in an embodiment of the present invention; Figure 3 This is a side view of the tensioning assembly for a foundry sand elevator provided in an embodiment of the present invention. Figure 4 For along Figure 2 Schematic diagram of the cross-sectional structure of line AA in the middle; Figure 5 For along Figure 2 Schematic diagram of the cross-sectional structure of the middle BB line; Figure 6 For along Figure 3 Schematic diagram of the cross-sectional structure of the middle CC line; The following are the labeling elements in the figure: 1. Housing; 2. Movable base; 3. Bearing housing; 4. Positive pressure air supply unit; 41. Air compressor; 42. Air pipe; 43. Filter; 5. Adjustment mechanism; 51. Screw; 52. Transmission base; 53. Handle; 6. Bellows; 7. Inspection window; 71. Sealing strip; 8. Sealing ring; 9. Dust collection mechanism; 91. Dust collection box; 92. Static generator; 93. Vibrating component; 94. Dust discharge valve; a1. Hoist; a2. Conveyor wheel; a3. Conveyor belt; a4. Shaft. Detailed Implementation

[0021] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0022] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0023] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0024] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0025] Please refer to the following: Figures 1 to 6 The present application describes a tensioning assembly for a foundry sand elevator and the foundry sand elevator itself. The elevator a1 has two conveyor wheels a2 arranged side-by-side in a vertical direction inside. A conveyor belt a3 is installed around the periphery of the two conveyor wheels a2. The tensioning assembly is used to connect to the shaft a4 of the lower conveyor wheel a2. The tensioning assembly is characterized by comprising: Two housings 1 are respectively installed on both sides of the elevator a1 along the axial direction of the conveyor wheel a2, and the two ends of the rotating shaft a4 pass through the two housings 1 respectively.

[0026] Two movable seats 2 are respectively installed inside two housings 1, and each movable seat 2 is slidably connected to the corresponding housing 1 in the vertical direction; each movable seat 2 is driven by an adjustment mechanism 5, which is used to adjust the vertical position of the movable seat 2. By driving the movable seat 2 to slide up and down along the housing 1 through the adjustment mechanism 5, the bearing seat 3 and the rotating shaft a4 are synchronously raised and lowered, thereby adjusting the position of the lower conveyor wheel a2 and realizing the tensioning or relaxation of the conveyor belt a3.

[0027] The two bearing seats 3 are fixedly connected to the two movable seats 2 respectively, and the two bearing seats 3 are rotatably connected to the two ends of the rotating shaft a4 respectively.

[0028] The positive pressure air supply unit 4 is located outside the elevator a1 and is connected to the inside of the two boxes 1. The positive pressure air supply unit 4 is used to supply gas with a pressure higher than the outside air pressure into the two boxes 1 to prevent dust from entering the inside of the boxes 1.

[0029] The positive pressure air supply unit 4 delivers gas with a pressure higher than the external air pressure into the housing 1, forming a positive pressure barrier in the gap between the housing 1 and the outside (such as the connection between the rotating shaft a4 and the housing 1) to prevent casting sand dust from entering the interior of the housing 1.

[0030] A pressure sensor can be installed on the movable seat 2 or the bearing seat 3 to monitor the tension of the conveyor belt a3 in real time. The position of the movable seat 2 can be automatically adjusted through the PLC control system to achieve closed-loop tension control.

[0031] In this embodiment, during the operation of the casting sand elevator, when the conveyor belt a3 becomes loose or excessively tensile due to long-term use, the adjusting mechanism 5 drives the moving seat 2 to slide up and down along the box 1. The moving seat 2 drives the bearing seat 3 and the conveyor wheel a2 shaft a4 connected to it to move synchronously, thereby adjusting the position of the lower conveyor wheel a2 to change the tension of the conveyor belt a3. At the same time, the positive pressure air supply unit 4 continuously supplies gas with a pressure higher than the external air pressure into the two boxes 1, so that a positive pressure environment is formed inside the box 1, and the airflow seeps out from inside the box 1 to the external environment, effectively preventing fine sand powder in the casting sand from entering the box 1 through the gap between the shaft a4 and the box 1, thereby creating a dust-free safe area inside the box 1.

[0032] Compared with the prior art, the tensioning component for the casting sand elevator provided in this application embodiment achieves precise dynamic adjustment of the tension of the conveyor belt a3 through the adjustment mechanism 5, effectively avoiding the problem of slippage or over-tension of the conveyor belt a3, and ensuring the stable operation of the elevator a1; the positive pressure air supply unit 4 replaces the traditional sealing structure, and fundamentally solves the problem of micron-level fine sand powder intrusion through the dual protection of physical isolation and air curtain sealing, preventing sand powder from mixing with lubricating oil to form grinding paste, significantly reducing abrasive wear on bearing raceways and gear tooth surfaces, reducing equipment operating noise and failure rate, extending component service life, reducing downtime maintenance frequency, and greatly reducing enterprise maintenance costs and production losses.

[0033] Further, please refer to Figures 1 to 6 As a specific embodiment of the tensioning component for the casting sand elevator provided by the present invention, the positive pressure air supply unit 4 includes an air compressor 41, two air pipes 42 and a filter 43.

[0034] Air compressor 41 is installed outside of elevator a1 to generate positive pressure airflow.

[0035] Two air pipes 42 correspond to two housings 1 respectively. One end of each air pipe 42 is connected to the corresponding housing 1, and the other end of each air pipe 42 is connected to the air outlet of the air compressor 41.

[0036] The filter 43 is fixedly connected to the air inlet of the air compressor 41 and is used to purify the gas drawn into the air compressor 41.

[0037] Air compressor 41 compresses air to generate positive pressure airflow; filter 43 purifies the intake air to prevent impurities from entering housing 1. The positive pressure airflow is delivered to the two housings 1 through air pipe 42 to ensure that the internal air pressure of each housing 1 is consistently higher than that of the outside.

[0038] A pressure sensor and regulating valve can be installed on the air pipe 42 to monitor the air pressure inside the housing 1 in real time and automatically adjust the output pressure of the air compressor 41 to avoid damage to the seals of the housing 1 due to excessive air pressure.

[0039] A dryer (such as an adsorption dryer) can be added after filter 43 to remove moisture from the air and prevent condensation and rust inside the housing 1.

[0040] A backup air compressor 41 and a switching valve can also be set up to automatically switch when the main air compressor 41 fails, ensuring that the positive pressure dust prevention function is not interrupted.

[0041] By adopting the above technical solution, filter 43 can ensure the cleanliness of the gas entering the chamber 1 and avoid secondary pollution; independent air delivery through air pipe 42 ensures uniform air pressure in each chamber 1. Filter 43 and air pipe 42 have simple structures and are easy to clean and replace regularly.

[0042] Further, please refer to Figures 1 to 6 As a specific embodiment of the tensioning component for the casting sand elevator provided by the present invention, the adjusting mechanism 5 includes a screw 51 and a transmission seat 52.

[0043] The screw 51 is rotatably connected to the corresponding housing 1, and the axial direction of the screw 51 is parallel to the vertical direction; the lower end of the screw 51 has a handle 53 coaxially arranged.

[0044] The transmission seat 52 is fixedly connected to the corresponding movable seat 2, and the transmission seat 52 is threadedly connected to the screw 51.

[0045] When the screw 51 is rotated, the transmission seat 52 is adapted to drive the movable seat 2 to move upward or downward.

[0046] By rotating the handle 53, the screw 51 is driven to rotate. Through the threaded engagement between the transmission seat 52 and the screw 51, the rotational motion is converted into the up-and-down linear motion of the moving seat 2, thereby adjusting the position of the rotating shaft a4.

[0047] The handle 53 can be replaced with a servo motor or a stepper motor, which drives the screw 51 to rotate, thereby achieving remote or automatic tension adjustment.

[0048] A trapezoidal thread or a ball screw is used between the screw 51 and the transmission seat 52. The self-locking characteristic of the thread (trapezoidal thread) or the low friction characteristic (ball screw) prevents the moving seat 2 from sliding under load. A scale is added to the outside of the screw 51 or the housing 1. The lifting distance of the moving seat 2 is displayed visually by the number of rotations of the handle 53 or the scale position, which facilitates precise adjustment.

[0049] By adopting the above technical solution, manual adjustment is possible without additional power, making it suitable for small and medium-sized hoists a1 or for quick on-site adjustments. The threaded connection between the screw 51 and the transmission seat 52 has a strong load-bearing capacity and can stably support the weight of the moving seat 2 and the rotating shaft a4.

[0050] Further, please refer to Figures 1 to 6 As a specific embodiment of the tensioning assembly for the casting sand elevator provided by the present invention, the lower end of the screw 51 passes through the housing 1 to the outside of the housing 1, and the handle 53 is located outside the housing 1; a bellows 6 is sleeved on the outside of the part of the screw 51 located outside the housing 1, the upper end of the bellows 6 is fixedly connected to the lower side of the housing 1, and the lower end of the bellows 6 is slidably connected to the upper side of the handle 53.

[0051] The corrugated pipe 6 is fitted onto the screw 51 outside the housing 1. The upper end is fixed to the lower side of the housing 1, and the lower end is slidably connected to the handle 53 to form a flexible sealing cover, which prevents dust from entering the gap between the screw 51 and the housing 1, while not affecting the rotation of the screw 51.

[0052] Stainless steel corrugated pipe 6 can be used to replace rubber corrugated pipe 6, which can improve high temperature resistance and wear resistance and adapt to the high temperature environment of the foundry workshop.

[0053] By adopting the above technical solution, the bellows 6, in conjunction with the positive pressure air supply, further isolates external dust and protects the threads of the screw 51 from wear. The flexible design of the bellows 6 allows the screw 51 to rotate and move slightly up and down without affecting the normal operation of the regulating mechanism 5. This reduces corrosion and jamming of the screw 51 and lowers the maintenance frequency of the regulating mechanism 5.

[0054] Further, please refer to Figures 1 to 6 As a specific embodiment of the tensioning component for the casting sand elevator provided by the present invention, the box 1 is provided with an inspection window 7 on the side facing away from the elevator a1; the inspection window 7 is hinged to the box 1, and a sealing strip 71 is provided in the gap between the inspection window 7 and the box 1.

[0055] The hinged inspection window 7 allows for quick opening of the housing 1, enabling inspection, lubrication, or replacement of internal components such as the movable seat 2, bearing seat 3, and screw 51. The sealing strip 71 ensures the airtightness of the window when closed, maintaining a positive pressure environment inside the housing 1.

[0056] The panel of inspection window 7 can be replaced with tempered glass or polycarbonate plate, allowing observation of the internal components' operating status, such as wear of bearing housing 3 and dust accumulation, without opening the window.

[0057] Clip-on or pneumatic quick-opening devices can be used to replace traditional bolt fixing, improving maintenance efficiency and reducing downtime.

[0058] By adopting the above technical solution, internal maintenance can be performed without disassembling the entire enclosure 1, reducing the labor intensity of workers. The sealing strip 71 ensures airtightness when the window is closed and does not affect the positive pressure dustproof effect.

[0059] Further, please refer to Figures 1 to 6 As a specific embodiment of the tensioning component for the casting sand elevator provided by the present invention, a rotating sealing ring 8 is provided between the housing 1 and the rotating shaft a4.

[0060] The rotating sealing ring 8 can be a lip seal 8 or a labyrinth seal 8, installed at the penetration point between the rotating shaft a4 and the housing 1. When the rotating shaft a4 rotates, it fits tightly against its surface to prevent the leakage of positive pressure gas inside the housing 1 and the entry of external dust.

[0061] Two sealing rings 8 can be installed between the rotating shaft a4 and the housing 1, with grease filling the middle to form a double sealing and lubrication effect, which is suitable for high dust and high speed working conditions.

[0062] By adopting the above technical solution, the dynamic sealing problem during the rotation of shaft a4 can be solved, and the dust prevention effect can be further improved in conjunction with positive pressure air supply. This reduces the leakage of positive pressure gas inside housing 1, decreases the workload of air compressor 41, and saves energy. It also prevents dust from entering bearing housing 3, avoiding wear on shaft a4 and bearings, and extending their service life.

[0063] Further, please refer to Figures 1 to 6 As a specific embodiment of the tensioning component for the casting sand elevator provided by the present invention, the tensioning component also includes a dust collection mechanism 9.

[0064] The dust collection mechanism 9 is located on the inner bottom surface of the box 1 and is used to absorb the dust inside the box 1.

[0065] The dust collection mechanism 9 is installed on the bottom surface inside the box 1. It collects a small amount of dust that enters the box 1 through physical adsorption (such as electrostatic or filtration) or gravity settling, such as dust that seeps in after the sealing ring 8 wears out.

[0066] A negative pressure fan can be connected to the dust collection mechanism 9 to actively draw the dust in the housing 1 into the dust collection box 91 through negative pressure, which is suitable for scenarios with high dust concentration.

[0067] By adopting the above technical solution, even if a small amount of dust enters the housing 1, it can be collected by the dust collection mechanism 9, preventing dust from accumulating inside the housing 1 and affecting the operation of the components. This reduces the frequency of component cleaning due to dust accumulation and lowers maintenance costs.

[0068] Further, please refer to Figures 1 to 6 As a specific embodiment of the tensioning component for the casting sand elevator provided by the present invention, the dust collection mechanism 9 includes a dust collection box 91, an electrostatic generator 92, and a vibration component 93.

[0069] The dust collection box 91 is fixedly installed on the inner bottom surface of the box body 1.

[0070] An electrostatic generator 92 is installed inside the dust collection box 91 to intermittently generate static electricity to attract dust inside the box 1.

[0071] The vibration component 93 is disposed inside the dust collection box 91 and is used to generate mechanical vibration. The vibration component 93 is connected to the electrostatic generator 92.

[0072] When the electrostatic generator 92 generates static electricity, the vibration component 93 is adapted to stop working; when the electrostatic generator 92 stops working, the vibration component 93 is adapted to transmit mechanical vibration to the electrostatic generator 92 to shake off the dust adsorbed on the electrostatic generator 92.

[0073] The electrostatic generator 92 generates an electrostatic field, causing dust particles to become charged and adhere to its surface. When the electrostatic generator 92 stops working, the vibrating component 93 (such as an electromagnetic vibrator) generates mechanical vibration, shaking the adsorbed dust particles to the bottom of the dust collection box 91. The periodic cycle of adsorption, vibration, and desorption is achieved through a control system, continuously collecting dust particles.

[0074] Multiple electrostatic generators 92 can be installed inside the housing 1 to cover dust-prone areas such as the movable base 2, screw 51, and bearing housing 3, thereby improving dust collection efficiency. The frequency and amplitude of the vibrating component 93 can be adjusted according to the amount of dust accumulation to prevent excessive vibration from causing components to loosen.

[0075] By adopting the above technical solution, electrostatic adsorption achieves a much higher efficiency in capturing fine dust particles than traditional filtration methods. Vibration desorption eliminates the need to replace the filter material; only periodic cleaning of the dust collection box 91 is required, reducing maintenance costs.

[0076] Further, please refer to ​As a specific embodiment of the tensioning component for the casting sand elevator provided by the present invention, the lower end of the dust collection box 91 is connected to the outside of the housing 1, and the lower end of the dust collection box 91 is connected to the ash discharge valve 94; by opening the ash discharge valve 94, the dust inside the dust collection box 91 can be discharged.

[0077] The lower end of the dust collection box 91 is connected to the outside through the dust discharge valve 94. When the valve is opened, the dust at the bottom of the dust collection box 91 is discharged from the box 1 under the action of gravity or positive pressure airflow; when the valve is closed, the box 1 is kept sealed.

[0078] By adopting the above technical solution, dust can be quickly discharged through the valve without disassembling the dust collection box 91, reducing the labor intensity of workers. When the ash discharge valve 94 is closed, it ensures the airtightness of the box 1 and does not affect the positive pressure dust prevention effect.

[0079] The technical solution adopted in this application also provides a foundry sand elevator, including the tensioning component for the foundry sand elevator proposed in any of the preceding claims.

[0080] The beneficial effects of the foundry sand elevator provided in this embodiment are the same as those of the aforementioned tensioning components for foundry sand elevators, and will not be repeated here.

[0081] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A tensioning assembly for a casting sand elevator, the elevator having two conveying wheels arranged side by side in the up-down direction, a conveying belt being mounted on the periphery of the two conveying wheels, the tensioning assembly being used to connect to the rotating shaft of the conveying wheel on the lower side; characterized in that, The tensioning assembly comprises: two boxes, which are respectively arranged on two sides of the elevator along the axial direction of the conveying wheel, and the two ends of the rotating shaft respectively pass into the two boxes; two moving seats, which are respectively arranged in the two boxes, and each moving seat is slidingly connected with the corresponding box in the up-down direction; each moving seat is drivingly connected with an adjusting mechanism, which is used for adjusting the up-down position of the moving seat; two bearing seats, which are respectively fixedly connected with the two moving seats, and the two bearing seats are respectively rotatably connected with the two ends of the rotating shaft; and a positive pressure air supply unit, which is arranged outside the elevator and is in communication with the interiors of the two boxes; the positive pressure air supply unit is used for supplying gas with a pressure higher than the external air pressure into the two boxes to prevent dust from entering the interiors of the two boxes.

2. The tensioning assembly for a casting sand elevator as set forth in claim 1, wherein, The positive pressure air supply unit comprises: an air compressor, which is arranged outside the elevator and is used for generating a positive pressure air flow; two air pipes, which respectively correspond to the two boxes; one end of each air pipe is in communication with the corresponding box, and the other end of each air pipe is connected with the air outlet of the air compressor; and a filter, which is fixedly connected with the air inlet of the air compressor and is used for purifying the air sucked by the air compressor.

3. The tensioning assembly for a casting sand elevator as set forth in claim 1, wherein, The adjusting mechanism comprises: a screw rod, which is rotatably connected with the corresponding box and has an axial direction parallel to the up-down direction; the lower end of the screw rod has a coaxially arranged handle; and a driving seat, which is fixedly connected with the corresponding moving seat and is threadedly connected with the screw rod; wherein, when the screw rod is rotated, the driving seat is adapted to drive the moving seat to move upward or downward.

4. The tensioning assembly for a casting sand elevator as set forth in claim 3, wherein, The lower end of the screw rod passes through the box to the outside of the box, and the handle is located outside the box; the outer part of the screw rod outside the box is sleeved with a bellows, the upper end of the bellows is fixedly connected with the lower side of the box, and the lower end of the bellows is slidingly connected with the upper side of the handle.

5. The tensioning assembly for a casting sand elevator as set forth in claim 1, wherein, The side of the box away from the elevator is provided with a maintenance window; the maintenance window is hingedly connected with the box, and a gap between the maintenance window and the box is provided with a sealing strip.

6. The tensioning assembly for a casting sand elevator as set forth in claim 1, wherein, A rotating sealing ring is arranged between the box and the rotating shaft.

7. The tensioning assembly for a casting sand elevator as set forth in claim 1, wherein, The tensioning assembly further comprises: a dust collecting mechanism, which is arranged on the inner bottom surface of the box and is used for absorbing dust in the interior of the box.

8. The tensioning assembly for a casting sand elevator as set forth in claim 7, wherein, The dust collecting mechanism comprises: a dust collecting box, which is fixedly arranged on the inner bottom surface of the box; an electrostatic generator, which is arranged in the dust collecting box and is used for intermittently generating static electricity to adsorb dust in the interior of the box; and a vibrating member, which is arranged in the dust collecting box and is used for generating mechanical vibration, and the vibrating member is connected with the electrostatic generator; wherein, when the electrostatic generator generates static electricity, the vibrating member is adapted to stop working; when the electrostatic generator stops working, the vibrating member is adapted to transmit mechanical vibration to the electrostatic generator to shake off the dust adsorbed on the electrostatic generator.

9. The tensioning assembly for a casting sand elevator as set forth in claim 8, wherein, The lower end of the dust collecting box is communicated with the outside of the box body, and the lower end of the dust collecting box is connected with a dust discharging valve; by opening the dust discharging valve, dust inside the dust collecting box can be discharged.

10. A casting sand elevator characterized by, A tensioning assembly for a casting sand elevator, comprising the tensioning assembly according to any one of claims 1-9.

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