A new type of sand blasting machine for saw blade

Abstract

A new type of sand blasting machine for saw blade, the machine box is provided with a sand blasting area, the sand blasting area is rotatably provided with a saw blade mounting seat, the saw blade mounting seat is used for placing the saw blade; the machine box is provided with a pressing mechanism above the saw blade mounting seat, the pressing mechanism is used for fixing the saw blade on the saw blade mounting seat and driving the saw blade to rotate; the sand blasting area is provided with a sand blasting mechanism on one side of the saw blade mounting seat, the sand blasting mechanism is used for sand blasting treatment to the saw blade; the machine box is provided with a collecting hopper below the sand blasting area, the sand outlet of the collecting hopper is communicated with a circulating filtering feeding mechanism arranged on one side of the machine box through a pipeline, the circulating filtering feeding mechanism is communicated with multiple spray guns arranged on the sand blasting mechanism through a sand conveying pipe, and compressed air sends the emery provided by the circulating filtering feeding mechanism to the spray guns and performs sand blasting treatment to the saw blade. The utility model can effectively solve the problems in the prior art.

Description

Technical Field

[0001] This utility model relates to the field of saw blade production and processing technology, and in particular to a new type of sandblasting machine for saw blades. Background Technology

[0002] A sandblasting machine is a mechanical device that uses compressed air to propel abrasive particles onto the surface of a workpiece for impact grinding, rust removal, and other surface treatment processes. Different abrasives, including metallic and non-metallic abrasives, can be selected according to the surface treatment requirements of the workpiece. It is typically used to treat impurities, oxide layers, discoloration, paint, dirt, rust, and sludge deposits on the workpiece surface.

[0003] Currently, after the saw blades are processed with welded teeth, black welding marks are left at the welded areas, requiring the surface of the saw blade to be treated with a sandblasting machine. However, existing sandblasting machines cannot recycle the diamond abrasive used in saw blade sandblasting, resulting in high production costs and hindering the development of manufacturing enterprises. Utility Model Content

[0004] In view of the above-mentioned defects, the purpose of this utility model is to provide a new type of sandblasting machine for saw blades, which greatly reduces the production cost by circulating the supply of diamond abrasive through a circulating feeding mechanism, and can effectively solve the problems existing in the prior art.

[0005] The technical solution of this utility model is achieved through the following means: A novel sandblasting machine for saw blades includes a machine housing. The front of the machine housing has an inlet / outlet for loading and unloading saw blades. A working door is provided at the inlet / outlet to expose or conceal it. A sandblasting area is provided inside the machine housing, and a saw blade mounting seat is rotatably mounted within the sandblasting area for holding the saw blade. A blade pressing mechanism is provided above the saw blade mounting seat in the machine housing for fixing the saw blade to the mounting seat. The saw blade rotates as a result. A sandblasting mechanism is provided on one side of the saw blade mounting base in the sandblasting zone. The sandblasting mechanism is used to sandblast the saw blade. A collection funnel is provided below the sandblasting zone in the machine housing. The sand outlet of the collection funnel is connected to a circulating filter feeding mechanism provided on one side of the machine housing through a pipe. The circulating filter feeding mechanism is connected to multiple spray guns provided on the sandblasting mechanism through a sand conveying pipe. Compressed air delivers the diamond sand provided by the circulating filter feeding mechanism to the spray guns and sandblasts the saw blade.

[0006] As a further improvement to this technical solution, the chassis is also equipped with a touch screen on one side of the inlet and outlet, and a PLC control system is installed inside the chassis. The PLC control system is connected to the touch screen, the tablet pressing mechanism, the sandblasting mechanism, and the circulating filter feeding mechanism respectively. By inputting commands through the touch screen, the PLC control system controls the tablet pressing mechanism, the sandblasting mechanism, and the circulating filter feeding mechanism to work respectively.

[0007] As a further improvement to this technical solution, the circulating filtration and feeding mechanism includes a cyclone separator, an automatic sand adding mechanism, and a dust collector. An inlet on the side of the cyclone separator is connected to the sand outlet of the collecting funnel via a pipe. The cyclone separator is connected to the dust collector via an outlet at its top. A collecting bucket is located at the impurity discharge outlet at the bottom of the cyclone separator, and the collecting bucket is connected to the spray gun via a sand conveying pipe. The collecting funnel also has a connecting branch at the sand outlet, which is connected to the discharge outlet of the automatic sand adding mechanism via a conveying pipe. The collecting funnel is used to collect used corundum. The cyclone separator is used to separate dust and sand from the incoming corundum. The separated corundum enters the collecting bucket and is supplied to the spray gun via the sand conveying pipe. The dust collector is used to absorb dust generated during the separation process of the cyclone separator. The automatic sand adding mechanism is used to replenish the corundum.

[0008] As a further improvement to this technical solution, the cyclone separator is equipped with a material level switch at or above the impurity discharge outlet. The material level switch is used to monitor whether the amount of sand in the collection bucket has reached a preset threshold.

[0009] As a further improvement to this technical solution, the automatic sand feeding mechanism includes a feeding hopper, the bottom of which is provided with a discharge port, and a solenoid valve is provided at the discharge port. The discharge port conveys diamond sand to the branch port through the conveying pipe.

[0010] As a further improvement to this technical solution, the sandblasting mechanism further includes a front-to-back adjustment mechanism, a left-to-right adjustment mechanism, and a height-angle adjustment mechanism. The spray gun is mounted on the height-angle adjustment mechanism, the height-angle adjustment mechanism is mounted on the left-to-right adjustment mechanism, and the left-to-right adjustment mechanism is mounted on the front-to-back adjustment mechanism. The front-to-back adjustment mechanism is used to adjust the front-to-back position of the spray gun, the left-to-right adjustment mechanism is used to adjust the left-to-right position of the spray gun, and the height-angle adjustment mechanism is used to adjust the height and spray angle of the spray gun.

[0011] As a further improvement to this technical solution, the tableting mechanism includes a fixed seat, a movable seat, a tableting cylinder, a tableting shaft, and a tableting shaft rotation drive device. The fixed seat is located on the top of the machine housing, and the tableting cylinder is located on the top of the fixed seat. The piston rod of the tableting cylinder passes through the fixed seat and is connected to the movable seat. The tableting shaft rotation drive device is located on the movable seat. The rotation shaft of the tableting shaft rotation drive device passes through the movable seat and is fixedly connected to the top end of the tableting shaft. The bottom end of the tableting shaft passes through a bushing located on the top of the machine housing and is positioned above the saw blade mounting base. The tableting cylinder is used to drive the movable seat to move up and down, thereby realizing the up and down movement of the tableting shaft. The tableting shaft rotation drive device is used to drive the tableting shaft to rotate.

[0012] As a further improvement to this technical solution, the sandblasting mechanism is also provided with an air blowing nozzle, which is used to clean the saw blade after sandblasting.

[0013] As a further improvement to this technical solution, an air storage tank is also provided on the top of the chassis. The air storage tank is provided with multiple air outlet pipes, and each of the air outlet pipes is provided with a solenoid valve. One of the air outlet pipes is connected to the air blowing nozzle through an air supply pipe, and the other air outlet pipes are connected to the spray gun through an air supply pipe.

[0014] As a further improvement to this technical solution, the working door is opened and closed by a lifting cylinder located on the top of the chassis.

[0015] This utility model features a compact structure and convenient and quick operation. It uses a circulating filter feeding mechanism to circulate and supply diamond abrasive, completing a closed loop of "recovery-purification-replenishment-supply", which significantly reduces abrasive loss and production costs, and effectively solves the problems existing in the prior art. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0017] Figure 2 This is a three-dimensional structural diagram of the chassis after the front side panel has been removed in this utility model.

[0018] Figure 3 This is a three-dimensional structural diagram of the saw blade rotating seat installation in this utility model.

[0019] Figure 4 This is a three-dimensional structural diagram of the sandblasting mechanism in this utility model.

[0020] In the diagram: 1. Chassis; 11. Inlet / Outlet; 12. Working Door; 13. Touch Screen; 14. Collection Funnel; 141. Sand Outlet; 1411. Branch Outlet; 15. Anti-Pinch Light Grating; 2. Sandblasting Zone; 3. Saw Blade Mounting Base; 4. Tableting Mechanism; 4. Fixed Base; 41. Moving Base; 42. Tableting Cylinder; 43. Tableting Shaft; 44. Protective Rubber Sleeve; 441. Tableting Shaft Rotation Drive Device; 45. Sandblasting Mechanism; 5. Front / Back Adjustment Mechanism; 52. Left / Right Adjustment Mechanism; 53. Height / Angle Adjustment. Mechanism 54, air blowing nozzle 55, circulating filter feeding mechanism 6, cyclone separator 61, inlet 611, outlet 612, impurity discharge outlet 613, collection bucket 614, automatic sand adding mechanism 62, feeding hopper 621, discharge port 6211, feed port 6212, dust collector 63, material level switch 7, air storage tank 8, air outlet pipeline 81, lifting cylinder 9, saw blade 20, pipeline 30, sand conveying pipe 40, conveying pipe 50, air conveying pipe 60. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Please see Figure 1 - Figure 4As shown, this utility model provides a novel sandblasting machine for saw blades, including a housing 1. The front of the housing 1 has an inlet / outlet 11 for loading and unloading saw blades 20. A working door 12 is provided at the inlet / outlet 11 to expose or cover it. A touchscreen 13 is also provided on one side of the inlet / outlet 11. A sandblasting area 2 is provided inside the housing 1, and a saw blade mounting base 3 is rotatably mounted within the sandblasting area 2 for holding the saw blade 20. A pressing mechanism 4 is provided above the saw blade mounting base 3 in the housing 1 for fixing the saw blade 20 to the mounting base. The mounting base 3 drives the saw blade 20 to rotate; the sandblasting area 2 is equipped with a sandblasting mechanism 5 on one side of the saw blade mounting base 3, which is used to sandblast the saw blade 20; the machine housing 1 is equipped with a collecting funnel 14 below the sandblasting area 2, and the sand outlet 141 of the collecting funnel 14 is connected to a circulating filter feeding mechanism 6 on one side of the machine housing 1 through a pipe 30. The circulating filter feeding mechanism 6 is connected to multiple spray guns 51 on the sandblasting mechanism 5 through a sand conveying pipe 40. Compressed air delivers the diamond sand provided by the circulating filter feeding mechanism 6 to the spray guns 51 and sandblasts the saw blade 20. Specifically, the machine housing 1 is also equipped with a PLC control system, which is connected to the touch screen 13, the pressing mechanism 4, the sandblasting mechanism 5 and the circulating filter feeding mechanism 6 respectively. By inputting commands through the touch screen 13, the PLC control system controls the pressing mechanism 4, the sandblasting mechanism 5 and the circulating filter feeding mechanism 6 to work respectively. The circulating filter feeding mechanism 6 includes a cyclone separator 61, an automatic sand adding mechanism 62, and a vacuum cleaner 63. The inlet 611 on the side of the cyclone separator 61 is connected to the sand outlet 141 of the collecting funnel 14 via a pipe 30. The cyclone separator 61 is connected to the vacuum cleaner 63 via an outlet 612 at its top. A collecting bucket 614 is located at the impurity discharge outlet 613 at the bottom of the cyclone separator 61, and the collecting bucket 614 is connected to the spray gun 51 via a sand conveying pipe 40. The collecting funnel 14 has a sand outlet 141... A connecting branch port 1411 is also provided at point 41. The branch port 1411 is connected to the discharge port 6211 on the automatic sand-adding mechanism 62 via the conveying pipe 50. The collection funnel 14 is used to collect used corundum, the cyclone separator 61 is used to separate dust and sand from the incoming corundum, and the separated corundum enters the collection bucket 614 and is supplied to the spray gun 51 through the sand conveying pipe 40. The vacuum cleaner 63 is used to absorb the dust during the separation process of the cyclone separator 61, and the automatic sand-adding mechanism 62 is used to replenish the corundum. The collection funnel 14 is provided with a connecting branch port 1411 on the sand discharge port 141 to realize a dual-outlet design, which leads to the "recovery and purification path" of the cyclone separator 61 and the "replenishment path" of the automatic sand-adding mechanism 62 respectively. The cyclone separator 61 enables the reuse of corundum and reduces loss, the vacuum cleaner 63 ensures the purity of the sand, and the automatic sand-adding mechanism 62 solves the problem of insufficient sand quantity, ultimately ensuring that the spray gun 51 always obtains "sufficient and pure" corundum.The corundum is circulated and supplied through the circulating filter feeding mechanism 6, completing a closed loop of "recycling-purification-replenishment-supply", which greatly reduces the loss of corundum and production costs, and effectively solves the problems existing in the prior art. In this embodiment, the machine box 1 is provided with an anti-pinch grating 15 at the edge of the inlet and outlet 11. The inlet and outlet 11 at the front of the machine box 1 serves as the loading and unloading channel for the saw blade 20. During the closing process of the working door 12, if the anti-pinch grating 15 detects a foreign object (such as the operator's hand) in the channel, it will immediately trigger the working door 12 to stop closing, thus avoiding pinching accidents from the source and enhancing the level of safety protection.

[0023] To accommodate sandblasting of different saw blades 20 and achieve multi-purpose functionality, the sandblasting mechanism 5 also includes a front-to-back adjustment mechanism 52, a left-to-right adjustment mechanism 53, and a height-angle adjustment mechanism 54. The spray gun 51 is mounted on the height-angle adjustment mechanism 54, which is mounted on the left-to-right adjustment mechanism 53. The left-to-right adjustment mechanism 53 is mounted on the front-to-back adjustment mechanism 52. The front-to-back adjustment mechanism 52 is used to adjust the front-to-back position of the spray gun 51, the left-to-right adjustment mechanism 53 is used to adjust the left-to-right position of the spray gun 51, and the height-angle adjustment mechanism 54 is used to adjust the height and spray angle of the spray gun 51. This allows the spray gun 51 to sandblast saw blades 20 of different sizes, thus achieving multi-purpose functionality and expanding its application range.

[0024] To improve processing efficiency, the sandblasting mechanism 5 is also equipped with an air nozzle 55, which is used to clean the saw blade 20 after sandblasting to prevent the saw blade 20 from carrying dust.

[0025] To prevent insufficient sand in the collection tank 614, which would result in insufficient abrasive spray from the spray gun 51 and affect the efficiency and quality of sandblasting, a level switch 7 is installed at or above the impurity discharge outlet 613 of the cyclone separator 61. The level switch 7 is used to monitor whether the amount of sand in the collection tank 614 has reached a preset threshold. In this embodiment, the level switch 7 is a rotary paddle level switch, including a motor and blades. The motor drives the blades to rotate. When the amount of sand accumulates to the point of contacting the blades, the rotational resistance increases, causing the motor to stop. This causes the motor to output a switch signal to the PLC control system, which then controls the automatic sand-adding mechanism 62 to stop replenishing the sand. When the amount of sand decreases and the blades disengage, the motor automatically resets and resumes rotation, outputting a switch signal to the PLC control system. The PLC control system then controls the automatic sand-adding mechanism 62 to replenish the sand, thereby ensuring that the amount of sand in the circulating filter feeding mechanism 6 always meets the feeding requirements of the spray gun 51, eliminating the need for frequent manual replenishment.

[0026] Furthermore, the automatic abrasive feeding mechanism 62 includes a feeding hopper 621, with a discharge port 6211 at the bottom of the feeding hopper 621. A solenoid valve is installed at the discharge port 6211, and the discharge port 6211 conveys corundum to the branch port 1411 through the conveying pipe 50. In this embodiment, the feeding hopper 621 is funnel-shaped, wider at the top and narrower at the bottom, which facilitates material feeding. A feed inlet 6212 is provided at the top for manual or automatic replenishment of new corundum, and the discharge port 6211 at the bottom is directly connected to the solenoid valve. The feeding hopper 621 is preferably made of 304 stainless steel, which is wear-resistant, prevents impact and wear from corundum, and does not easily cause abrasive to stick.

[0027] Furthermore, the tableting mechanism 4 includes a fixed base 41, a movable base 42, a tableting cylinder 43, a tableting shaft 44, and a tableting shaft rotation drive device 45. The fixed base 41 is located on the top of the machine housing 1. The tableting cylinder 43 is located on the top of the fixed base 41. The piston rod of the tableting cylinder 43 passes through the fixed base 41 and is connected to the movable base 42. The tableting shaft rotation drive device 45 is located on the movable base 42. The rotation shaft of the tableting shaft rotation drive device 45 passes through the movable base 42 and is fixedly connected to the top end of the tableting shaft 44. The bottom end of the tableting shaft 44 passes through a bushing located on the top of the machine housing 1 and is positioned above the saw blade mounting base 3. The tableting cylinder 43 is used to drive the movable base 42 to move up and down, thereby realizing the up and down movement of the tableting shaft 44. The tableting shaft rotation drive device 45 is used to drive the tableting shaft 44 to rotate. In this embodiment, a protective rubber sleeve 441 is fitted on the shaft of the tableting shaft 44. During sandblasting, the protective rubber sleeve 441 protects the shaft and improves its service life.

[0028] Furthermore, an air tank 8 is also provided on the top of the chassis 1. Multiple air outlet pipes 81 are provided on the air tank 8, and each air outlet pipe 81 is equipped with a solenoid valve. One air outlet pipe 81 is connected to the air nozzle 55 via an air supply pipe 60, and the other air outlet pipes 81 are connected to the spray gun 51 via air supply pipes 60. In this embodiment, to improve functional accuracy, a pressure reducing valve is added after the solenoid valve of each air outlet pipe 81. Different air pressures are set for the spray gun 51 (which requires higher air pressure to drive the sand particles) and the air nozzle 55 (which requires lower air pressure to avoid damaging the saw blade 20), thereby improving functional accuracy. In addition, by placing the air tank 8 on the top of the chassis 1, the top space of the chassis 1 is fully utilized, thereby saving internal layout space and resulting in a compact and efficient design.

[0029] Furthermore, the working door 12 is opened and closed by the lifting cylinder 9 located on the top of the housing 1, making the opening and closing of the working door 12 more convenient.

[0030] For operation preparation, adjust the position of the spray gun 51 according to the size of the saw blade 20. During operation, input commands through the touch screen 13, and the PLC control system controls the operation of each part: the lifting cylinder 9 drives the working door 12 to open, the operator places the saw blade 20 on the saw blade mounting seat 3, and the lifting cylinder 9 drives the working door 12 to close; the pressing cylinder 43 drives the pressing shaft 44 to move downward, fixing the saw blade 20 on the saw blade mounting seat 3, and the pressing shaft rotation drive device 45 drives the pressing shaft 44 to rotate, thereby realizing the rotation of the saw blade 20. Compressed air delivers the diamond sand provided by the circulating filter feeding mechanism 6 to the spray gun 51 and performs sandblasting on the saw blade 20. After the sandblasting is completed, the air blowing nozzle 55 works to clean the surface of the saw blade 20. After cleaning, the pressing shaft 44 is reset, the working door 12 is opened, the operator takes out the saw blade 20, puts in the next saw blade 20, and repeats the above process until the same batch of saw blades 20 is processed. This invention uses a circulating filter feeding mechanism 6 to circulate and supply diamond abrasive, completing a closed loop of "recovery-purification-replenishment-supply", which greatly reduces abrasive loss and production costs, and can effectively solve the problems existing in the prior art.

[0031] Although specific embodiments of the present invention have been described above, those skilled in the art should understand that these are merely illustrative examples, and various changes or modifications can be made to these embodiments without departing from the principles and essence of the present invention. The scope of protection of the present invention is defined only by the appended claims.

Claims

1. A novel sandblasting machine for saw blades, characterized in that, The system includes a chassis with an inlet / outlet at the front for loading and unloading saw blades. The inlet / outlet also has a working door for exposing or concealing the inlet / outlet. Inside the chassis is a sandblasting area with a rotatable saw blade mounting base for holding the saw blade. Above the saw blade mounting base, the chassis has a blade pressing mechanism for fixing the saw blade to the mounting base and rotating it. A sandblasting mechanism is located on one side of the saw blade mounting base in the sandblasting area for sandblasting the saw blade. Below the sandblasting area, the chassis has a collecting funnel. The sand outlet of the collecting funnel is connected via a pipe to a circulating filter feeding mechanism located on one side of the chassis. The circulating filter feeding mechanism is connected via a sand conveying pipe to multiple spray guns mounted on the sandblasting mechanism. Compressed air delivers diamond powder provided by the circulating filter feeding mechanism to the spray guns for sandblasting the saw blade. The circulating filtration and feeding mechanism includes a cyclone separator, an automatic sand-adding mechanism, and a vacuum cleaner. An inlet on the side of the cyclone separator is connected to the sand outlet of a collecting funnel via a pipe. An outlet at the top of the cyclone separator is connected to the vacuum cleaner. A collecting bucket is located at the impurity discharge outlet at the bottom of the cyclone separator, and this collecting bucket is connected to the spray gun via a sand-feeding pipe. The collecting funnel also has a branch outlet at the sand outlet, which is connected to the discharge outlet of the automatic sand-adding mechanism via a conveying pipe. The collecting funnel is used to collect used corundum. The cyclone separator separates the incoming corundum into dust and sand. The separated corundum enters the collecting bucket and is supplied to the spray gun via the sand-feeding pipe. The vacuum cleaner is used to absorb the dust from the cyclone separator. The automatic abrasive feeding mechanism is used to replenish the corundum during the dust separation process. The tableting mechanism includes a fixed base, a movable base, a tableting cylinder, a tableting shaft, and a tableting shaft rotation drive device. The fixed base is located on the top of the machine housing, and the tableting cylinder is located on the top of the fixed base. The piston rod of the tableting cylinder passes through the fixed base and is connected to the movable base. The tableting shaft rotation drive device is located on the movable base. The rotation shaft of the tableting shaft rotation drive device passes through the movable base and is fixedly connected to the top end of the tableting shaft. The bottom end of the tableting shaft passes through a bushing located on the top of the machine housing and is positioned above the saw blade mounting base. The tableting cylinder is used to drive the movable base to move up and down, thereby realizing the up and down movement of the tableting shaft. The tableting shaft rotation drive device is used to drive the tableting shaft to rotate.

2. The novel sandblasting machine for saw blades according to claim 1, characterized in that, The chassis is also equipped with a touch screen on one side of the inlet and outlet. A PLC control system is installed inside the chassis. The PLC control system is connected to the touch screen, the tablet pressing mechanism, the sandblasting mechanism, and the circulating filter feeding mechanism. Commands are input through the touch screen, and the PLC control system controls the tablet pressing mechanism, the sandblasting mechanism, and the circulating filter feeding mechanism to work respectively.

3. A novel sandblasting machine for saw blades according to claim 1, characterized in that, The cyclone separator is equipped with a material level switch at or above the impurity discharge outlet. The material level switch is used to monitor whether the amount of sand in the collection bucket has reached a preset threshold.

4. A novel sandblasting machine for saw blades according to claim 1, characterized in that, The automatic sand feeding mechanism includes a feeding hopper, the bottom of which is provided with a discharge port, and a solenoid valve is provided at the discharge port. The discharge port feeds diamond sand to the branch port through the conveying pipe.

5. A novel sandblasting machine for saw blades according to claim 1, characterized in that, The sandblasting mechanism further includes a front-to-back adjustment mechanism, a left-to-right adjustment mechanism, and a height-angle adjustment mechanism. The spray gun is mounted on the height-angle adjustment mechanism, the height-angle adjustment mechanism is mounted on the left-to-right adjustment mechanism, and the left-to-right adjustment mechanism is mounted on the front-to-back adjustment mechanism. The front-to-back adjustment mechanism is used to adjust the front-to-back position of the spray gun, the left-to-right adjustment mechanism is used to adjust the left-to-right position of the spray gun, and the height-angle adjustment mechanism is used to adjust the height and spray angle of the spray gun.

6. A novel sandblasting machine for saw blades according to claim 1, characterized in that, The sandblasting mechanism is also equipped with an air nozzle, which is used to clean the saw blade after sandblasting.

7. A novel sandblasting machine for saw blades according to claim 6, characterized in that, The top of the chassis is also equipped with an air tank, which has multiple air outlet pipes. Each air outlet pipe is equipped with a solenoid valve. One of the air outlet pipes is connected to the air nozzle through an air supply pipe, and the other air outlet pipes are connected to the spray gun through air supply pipes.

8. A novel sandblasting machine for saw blades according to claim 1, characterized in that, The working door is opened and closed by a lifting cylinder located on the top of the chassis.

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