Air tightness detection device for sealing plug of automobile speed reducer

Abstract

The utility model discloses an air tightness detection device for a sealing plug of an automobile speed reducer, which belongs to the technical field of automobile part processing and comprises a base, a feeding and discharging conveying device, an air tightness detection device and a material distribution device. The base is provided with a feeding and discharging conveying device used for conveying plugs, an air tightness detection device used for conducting air tightness detection on the plugs and a distributing device used for conducting good and defective product distribution on the plugs, and the base is provided with a feeding rail. The feeding and discharging conveying device comprises a driving displacement assembly used for driving the plugs to move, a plurality of clamping and separating assemblies used for clamping the plugs and a rotary feeding and discharging assembly used for driving the plugs to rotate so as to be disassembled and assembled. By means of the mode, through the arrangement of the multiple clamping and separating assemblies, the multiple plugs can be detected at a time, the detection time is shortened, the working efficiency is improved, only one driving end is needed for disassembly and assembly of the multiple plugs in cooperation with the arrangement of the rotary feeding and discharging assembly, resources are saved, and synchronism is high.

Description

Technical Field

[0001] This utility model relates to the field of automotive parts processing technology, specifically to a device for testing the airtightness of a sealing plug for an automotive reducer. Background Technology

[0002] The plug in an automotive gearbox is a sealed component inside the gearbox, used to prevent lubricating oil leakage, dust and impurities from entering, and to maintain the pressure balance inside the gearbox. Generally, automotive gearbox sealing plugs undergo airtightness testing during production to ensure their reliability.

[0003] For example, Chinese patent application CN109211490B discloses an airtightness testing device, including a base, a flow channel module mounted on the base, an air intake module, a testing module, and a data collection mechanism. The air intake module includes an air intake channel and an air intake valve, with the air intake valve installed inside the air intake channel. The testing module includes a first testing plug capable of detecting air pressure and a first testing flow channel disposed within the flow channel module. One end of the first testing flow channel is connected to the air intake channel, and the other end of the first testing flow channel can be sealed and connected to the cavity of the workpiece to be tested. The first testing plug is installed on the end of the first testing flow channel near the workpiece to be tested, and the first testing plug can be located inside the cavity of the workpiece to be tested. The data collection mechanism includes a processor, which is signal-connected to the first testing plug, and the air intake valve is signal-connected to the processor.

[0004] However, this airtightness testing device is difficult to use to test the airtightness of the sealing plugs of automotive gearboxes, and it requires manual loading and unloading, resulting in slow testing speed and low work efficiency.

[0005] Based on this, this utility model designs an airtightness testing device for automotive reducer sealing plugs to solve the above problems. Utility Model Content

[0006] In view of the above-mentioned shortcomings of the existing technology, the present invention provides a device for testing the air tightness of the sealing plug of an automobile reducer.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A device for testing the air tightness of a sealing plug for an automotive reducer includes a base, as well as a loading and unloading conveying device, an air tightness testing device, and a material distribution device.

[0009] The base is equipped with a loading and unloading conveying device for conveying plugs, an airtightness testing device for airtightness testing of plugs, and a material distribution device for separating good and defective plugs. The base is also equipped with a loading track.

[0010] The loading and unloading conveying device includes a drive displacement assembly for moving the plug, multiple clamping and separating assemblies for clamping the plug, and a rotating loading and unloading assembly for rotating the plug to disassemble and assemble. The multiple clamping and separating assemblies and the rotating loading and unloading assembly are mounted on the drive displacement assembly and connected to each other.

[0011] Furthermore, the drive displacement assembly includes a linear module, a track plate, a push plate, a fixed plate, a cylinder, and an electric telescopic rod. The linear module is fixedly installed on the upper end of the base. The track plate is fixedly installed on the left side of the moving end of the linear module. Two fixed plates are respectively limited and slidably installed at the front and rear ends of the track plate. A push plate is fixedly installed between the two fixed plates. The cylinder is fixedly installed at one end of the track plate, and the output end of the cylinder is fixedly connected to the push plate. The electric telescopic rod is fixedly installed on the upper end of the base, and the output end of the electric telescopic rod is fixedly connected to the track plate. The track plate and the push plate are connected to the clamping and separating assembly, and the fixed plate is connected to the rotating loading and unloading assembly.

[0012] Furthermore, the track plate is provided with multiple sliding grooves, the right and left sections of which are arranged in parallel, and the middle section of which is gradually inclined outward from right to left towards the outside of the track plate. The multiple sliding grooves present a uniformly divergent shape as a whole.

[0013] Furthermore, multiple clamping and separating components are evenly distributed on the left end of the push plate. Each clamping and separating component includes a sliding plate, a clamping cylinder, and a sliding rod. The right end of the sliding plate is slidably connected to the push plate for limiting. The lower end of the sliding plate is rotatably mounted with a clamping cylinder via an air guide slip ring. The upper end of the sliding plate is fixedly mounted with a sliding rod, which slides along the groove of the track plate. The upper ends of the sliding plate and the clamping cylinder are connected to the rotating loading and unloading components.

[0014] Furthermore, the rotary loading and unloading assembly includes a motor, a splined shaft, and multiple transmission components. The motor is fixedly mounted on the outside of a fixed plate, and the output end of the motor is fixedly connected to one end of the splined shaft. The two ends of the splined shaft are rotatably connected to the inner sides of two fixed plates, respectively. Multiple transmission components are evenly installed on the outside of the splined shaft, and the transmission components are connected to the sliding plate and the clamping cylinder.

[0015] Furthermore, the transmission component includes a spline sleeve, a helical gear set, and a rotating shaft. The helical gear set consists of two meshing helical gears. The spline sleeve is fitted onto the outside of the spline shaft and is slidably connected to the spline shaft. The spline sleeve is rotatably mounted on the upper end of the sliding plate. The outside of the spline sleeve is fixedly connected to one helical gear of the helical gear set, and the other helical gear is fixedly mounted on the outside of the rotating shaft. The rotating shaft is fixedly connected to the clamping cylinder and rotatably connected to the sliding plate.

[0016] Furthermore, the airtightness detection device includes a base plate, multiple limiting rods, multiple springs, multiple automotive reducer housings, and multiple air pressure sensors. The multiple limiting rods are fixedly installed at the lower end of the base plate, and the limiting rods pass through the base and are slidably connected to the base. The multiple springs are sleeved on the outside of the limiting rods, and the two ends of the springs are fixedly connected to the base and the base plate, respectively. The multiple automotive reducer housings are fixedly installed at the upper end of the base plate. The multiple air pressure sensors are fixedly installed on the inner side of the automotive reducer housings. The upper end of the automotive reducer housing has a threaded hole for fixing with a plug. The inner side of the automotive reducer housing is connected to the air supply equipment through a pipe. The air pressure sensors are electrically connected to the airtightness detector.

[0017] Furthermore, multiple material distribution devices are arranged in a front-to-back configuration. Each material distribution device includes a material distribution trough, a partition, a baffle, and a servo motor. The material distribution trough is fixedly installed on the base, with its bottom inclined. The partition is inclined and fixedly installed inside the material distribution trough, dividing it into upper and lower parts. The baffle is rotatably installed inside the material distribution trough, located in the middle of the partition, and is in contact with the partition. The partition has a through groove to accommodate the baffle. One side of the baffle is fixedly connected to the output end of the servo motor, which is fixedly installed outside the material distribution trough.

[0018] Compared with the prior art, the advantages of this utility model are as follows: 1. By setting multiple clamping and separating components, multiple plugs can be detected at one time, reducing detection time and improving work efficiency. With the setting of the rotating loading and unloading components, the disassembly and assembly of multiple plugs only requires one drive end, saving resources and achieving high synchronization.

[0019] 2. The force applied to the base plate by the spring ensures that the plug can maintain contact with the car reducer housing when the motor drives the plug to rotate, improving the tightening effect and avoiding errors in airtightness test results caused by incomplete rotation. The baffle driven by the servo motor blocks the plug, allowing good and defective plugs to be collected separately, resulting in a high degree of automation. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, 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 this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This utility model relates to a three-dimensional device for testing the airtightness of a sealing plug for an automotive reducer. Figure 1 ;

[0022] Figure 2 This is a left view of an airtightness testing device for an automotive reducer sealing plug according to the present invention;

[0023] Figure 3 This utility model relates to a three-dimensional device for testing the airtightness of a sealing plug for an automotive reducer. Figure 2 ;

[0024] Figure 4 For along Figure 2 A three-dimensional diagram of AA with a portion removed;

[0025] Figure 5 This is a partial perspective view of the rotary loading and unloading assembly of this utility model;

[0026] Figure 6 for Figure 4 Enlarged view of point B in the middle;

[0027] Figure 7 This is a perspective view of the hidden part of the material distribution trough in the material distribution device of this utility model.

[0028] The labels in the diagram represent:

[0029] 1. Base; 2. Loading / unloading conveyor; 21. Drive displacement assembly; 211. Linear module; 212. Track plate; 213. Push plate; 214. Fixing plate; 215. Cylinder; 216. Electric telescopic rod; 22. Clamping / separation assembly; 221. Sliding plate; 222. Clamping cylinder; 223. Slide rod; 23. Rotary loading / unloading assembly; 231. Motor; 232. Splined shaft; 233. Splined sleeve; 234. Helical gear set; 235. Rotating shaft; 3. Air tightness detection device; 31. Base plate; 32. Limiting rod; 33. Spring; 34. Car reducer housing; 35. Air pressure sensor; 4. Material distribution device; 41. Material distribution trough; 42. Partition plate; 43. Baffle plate; 44. Servo motor. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0031] Example 1: In some embodiments, please refer to the accompanying drawings. Figures 1-7 An air tightness testing device for a sealing plug of an automobile reducer includes a base 1, a loading and unloading conveying device 2, an air tightness testing device 3, and a material distribution device 4.

[0032] The base 1 is equipped with a loading and unloading conveying device 2 for conveying plugs, an airtightness detection device 3 for airtightness detection of plugs, and a material distribution device 4 for separating good and defective plugs. The base 1 is also equipped with a loading track.

[0033] The loading and unloading conveying device 2 includes a drive displacement assembly 21 for moving the plug, multiple clamping and separating assemblies 22 for clamping the plug, and a rotating loading and unloading assembly 23 for rotating the plug to disassemble and assemble. The multiple clamping and separating assemblies 22 and the rotating loading and unloading assembly 23 are mounted on the drive displacement assembly 21 and are connected.

[0034] When the automotive reducer sealing plug airtightness testing device is in normal use, the drive displacement component 21 is activated to move the clamping separation component 22 above the feeding track. Multiple clamping separation components 22 are activated to clamp the plugs and transport them to the airtightness testing device 3. The rotating loading and unloading component 23 is activated, which drives the clamping separation component 22 to rotate, thereby sealing and fixing the plugs on the airtightness testing device 3. The airtightness testing device 3 is activated to perform airtightness testing on the plugs. After the test is completed, the rotating loading and unloading component 23 is activated to disassemble the plugs. The drive displacement component 21 is activated to transport the plugs to the distribution device 4. The distribution device 4 separates the plugs into good and defective products according to the test results. The setting of multiple clamping separation components 22 allows multiple plugs to be tested at the same time, reducing testing time and improving work efficiency. The setting of the rotating loading and unloading component 23 means that the disassembly and assembly of multiple plugs only requires one drive end, saving resources and ensuring high synchronization.

[0035] The drive displacement assembly 21 includes a linear module 211, a track plate 212, a push plate 213, a fixed plate 214, a cylinder 215, and an electric telescopic rod 216. The linear module 211 is fixedly installed on the upper end of the base 1. The track plate 212 is fixedly installed on the left side of the moving end of the linear module 211. Two fixed plates 214 are respectively limited and slidably installed at the front and rear ends of the track plate 212. The push plate 213 is fixedly installed between the two fixed plates 214. The cylinder 215 is fixedly installed at one end of the track plate 212. The output end of the cylinder 215 is fixedly connected to the push plate 213. The electric telescopic rod 216 is fixedly installed on the upper end of the base 1. The output end of the electric telescopic rod 216 is fixedly connected to the track plate 212. The track plate 212 and the push plate 213 are connected to the clamping and separating assembly 22. The fixed plate 214 is connected to the rotating loading and unloading assembly 23.

[0036] The track plate 212 is provided with multiple sliding grooves. The right and left sections of the sliding grooves are arranged in parallel, and the middle section of the sliding grooves gradually slopes outward from right to left towards the outside of the track plate 212. The multiple sliding grooves present a uniformly divergent shape as a whole.

[0037] Multiple clamping and separating components 22 are evenly distributed on the left end of the push plate 213. Each clamping and separating component 22 includes a sliding plate 221, a clamping cylinder 222, and a sliding rod 223. The right end of the sliding plate 221 is slidably connected to the push plate 213. The lower end of the sliding plate 221 is rotatably mounted with the clamping cylinder 222 through an air guide slip ring. The upper end of the sliding plate 221 is fixedly mounted with the sliding rod 223. The sliding rod 223 slides along the slide groove of the track plate 212. The upper ends of the sliding plate 221 and the clamping cylinder 222 are connected to the rotating loading and unloading component 23.

[0038] The rotating loading and unloading assembly 23 includes a motor 231, a splined shaft 232, and multiple transmission components. The motor 231 is fixedly installed on the outside of a fixed plate 214. The output end of the motor 231 is fixedly connected to one end of the splined shaft 232. Both ends of the splined shaft 232 are rotatably connected to the inner sides of two fixed plates 214 respectively. Multiple transmission components are evenly installed on the outside of the splined shaft 232. The transmission components are connected to the sliding plate 221 and the clamping cylinder 222.

[0039] The transmission component includes a spline sleeve 233, a helical gear set 234, and a rotating shaft 235. The helical gear set 234 consists of two meshing helical gears. The spline sleeve 233 is sleeved on the outside of the spline shaft 232 and is slidably connected to the spline shaft 232. The spline sleeve 233 is rotatably mounted on the upper end of the sliding plate 221. The outside of the spline sleeve 233 is fixedly connected to one helical gear of the helical gear set 234, and the other helical gear is fixedly mounted on the outside of the rotating shaft 235. The rotating shaft 235 is fixedly connected to the clamping cylinder 222 and rotatably connected to the sliding plate 221.

[0040] The airtightness testing device 3 includes a base plate 31, multiple limiting rods 32, multiple springs 33, multiple automotive reducer housings 34, and multiple air pressure sensors 35. The multiple limiting rods 32 are fixedly installed at the lower end of the base plate 31 and slide through the base 1. The multiple springs 33 are sleeved on the outside of the limiting rods 32, and the two ends of the springs 33 are fixedly connected to the base 1 and the base plate 31, respectively. The multiple automotive reducer housings 34 are fixedly installed at the upper end of the base plate 31. The multiple air pressure sensors 35 are fixedly installed on the inner side of the automotive reducer housings 34. The upper end of the automotive reducer housings 34 is provided with threaded holes for fixing with plugs. The inner side of the automotive reducer housings 34 is connected to the air supply equipment through a pipe. The air pressure sensors 35 are electrically connected to the airtightness tester.

[0041] Multiple material distribution devices 4 are arranged in a front-to-back arrangement. Each material distribution device 4 includes a material distribution trough 41, a partition 42, a baffle 43, and a servo motor 44. The material distribution trough 41 is fixedly installed on the base 1. The bottom of the material distribution trough 41 is inclined. The partition 42 is inclinedly and fixedly installed on the inner side of the material distribution trough 41 to divide the material distribution trough 41 into upper and lower parts. The baffle 43 is rotatably installed on the inner side of the material distribution trough 41. The baffle 43 is located in the middle of the partition 42 and is in contact with the partition 42. The partition 42 has a through groove to accommodate the baffle 43. One side of the baffle 43 is fixedly connected to the output end of the servo motor 44. The servo motor 44 is fixedly installed on the outer side of the material distribution trough 41.

[0042] When the airtightness testing device for the sealing plug of the automobile reducer is in normal use, the linear module 211 is activated to move the track plate 212 up and down. The electric telescopic rod 216 is used to limit and support the track plate 212. The cylinder 215 is activated, which drives the push plate 213 and the fixed plate 214 to move left and right along the track plate 212. The push plate 213 drives the sliding plate 221, the clamping cylinder 222 and the slide rod 223 to move. The slide rod 223 slides along the groove of the track plate 212. The motor drives the sliding plate 221 to move back and forth. Multiple clamping cylinders 222 clamp the plug on the feeding track and transport it above the car reducer housing 34. Spring 33 pushes the base plate 31 to make the car reducer housing 34 contact the plug. The motor 231 is started. The motor 231 drives the spline shaft 232, spline sleeve 233, helical gear set 234 and rotating shaft 235 to rotate in sequence. The rotating shaft 235 drives the clamping cylinders 222 to rotate. The clamping cylinders 222 drive the plug to rotate. The plug is sealed to the car reducer housing 34. The air supply equipment is started to inflate the inside of the car reducer housing 34. The air tightness tester receives the data from the air pressure sensor 35 to complete the air tightness test of the plug. After the test is completed, the reverse start motor 231 drives the plug to be disassembled from the car reducer housing 34. The linear module 211 and cylinder 215 are started to move the plug to the upper end of the distribution trough 41. Good plugs fall to the top of the partition plate 42 and roll down for collection. When a defective plug is detected, the corresponding servo motor 44 drives the baffle 43 to rotate. The defective plug falls to the bottom of the partition plate 42 and rolls down for collection. The force applied to the bottom plate 31 by the spring 33 makes the plug keep in contact with the car reducer housing 34 when the motor 231 drives the plug to rotate, which improves the tightening effect and avoids errors in the air tightness test results caused by incomplete rotation. The baffle 43 driven by the servo motor 44 blocks the plug, so that the good and defective plugs are separated and collected, with a high degree of automation.

[0043] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A device for testing the air tightness of a sealing plug for an automotive reducer, comprising a base (1), characterized in that: It also includes a loading and unloading conveying device (2), an airtightness detection device (3) and a material distribution device (4). The base (1) is equipped with a loading and unloading conveying device (2) for conveying the plug, an airtightness detection device (3) for airtightness detection of the plug, and a material distribution device (4) for separating good and bad products of the plug. The base (1) is equipped with a loading track. The loading and unloading conveying device (2) includes a drive displacement assembly (21) for moving the plug, multiple clamping and separating assemblies (22) for clamping the plug, and a rotating loading and unloading assembly (23) for rotating the plug to disassemble and assemble. The multiple clamping and separating assemblies (22) and the rotating loading and unloading assembly (23) are mounted on the drive displacement assembly (21), and the clamping and separating assemblies (22) and the rotating loading and unloading assembly (23) are connected.

2. The airtightness testing device for automotive reducer sealing plugs according to claim 1, characterized in that, The drive displacement assembly (21) includes a linear module (211), a track plate (212), a push plate (213), a fixed plate (214), a cylinder (215), and an electric telescopic rod (216). The linear module (211) is fixedly installed on the upper end of the base (1). The track plate (212) is fixedly installed on the left side of the moving end of the linear module (211). Two fixed plates (214) are respectively limited and slidably installed at the front and rear ends of the track plate (212). Between the two fixed plates (214) A push plate (213) is fixedly installed, a cylinder (215) is fixedly installed at one end of the track plate (212), the output end of the cylinder (215) is fixedly connected to the push plate (213), an electric telescopic rod (216) is fixedly installed on the upper end of the base (1), the output end of the electric telescopic rod (216) is fixedly connected to the track plate (212), the track plate (212), the push plate (213) are connected to the clamping and separating assembly (22), and the fixed plate (214) is connected to the rotating loading and unloading assembly (23).

3. The airtightness testing device for the sealing plug of an automotive reducer according to claim 2, characterized in that, The track plate (212) is provided with multiple sliding grooves. The right and left sections of the sliding grooves are arranged in parallel, and the middle section of the sliding grooves gradually slopes outward from right to left towards the outside of the track plate (212). The multiple sliding grooves present a uniformly divergent shape as a whole.

4. The airtightness testing device for the sealing plug of an automotive reducer according to claim 3, characterized in that, Multiple clamping and separating components (22) are evenly distributed on the left end of the push plate (213). Each clamping and separating component (22) includes a sliding plate (221), a clamping cylinder (222), and a sliding rod (223). The right end of the sliding plate (221) is slidably connected to the push plate (213). The lower end of the sliding plate (221) is rotatably mounted with the clamping cylinder (222) through a guide air slip ring. The upper end of the sliding plate (221) is fixedly mounted with the sliding rod (223). The sliding rod (223) slides along the groove of the track plate (212). The upper ends of the sliding plate (221) and the clamping cylinder (222) are connected to the rotating loading and unloading component (23).

5. The airtightness testing device for the sealing plug of an automotive reducer according to claim 4, characterized in that, The rotating loading and unloading assembly (23) includes a motor (231), a spline shaft (232), and multiple transmission components. The motor (231) is fixedly installed on the outside of a fixed plate (214). The output end of the motor (231) is fixedly connected to one end of the spline shaft (232). The two ends of the spline shaft (232) are rotatably connected to the inner sides of two fixed plates (214) respectively. Multiple transmission components are evenly installed on the outside of the spline shaft (232). The transmission components are connected to the sliding plate (221) and the clamping cylinder (222).

6. The airtightness testing device for automotive reducer sealing plugs according to claim 5, characterized in that, The transmission components include a spline sleeve (233), a helical gear set (234), and a rotating shaft (235). The helical gear set (234) consists of two meshing helical gears. The spline sleeve (233) is sleeved on the outside of the spline shaft (232) and is slidably connected to the spline shaft (232). The spline sleeve (233) is rotatably mounted on the upper end of the sliding plate (221). The outside of the spline sleeve (233) is fixedly connected to one helical gear of the helical gear set (234), and the other helical gear is fixedly mounted on the outside of the rotating shaft (235). The rotating shaft (235) is fixedly connected to the clamping cylinder (222) and rotatably connected to the sliding plate (221).

7. The device for testing the airtightness of the sealing plug of an automotive reducer according to claim 1, characterized in that, The airtightness testing device (3) includes a base plate (31), multiple limit rods (32), multiple springs (33), multiple car reducer housings (34), and multiple air pressure sensors (35). The multiple limit rods (32) are fixedly installed at the lower end of the base plate (31). The limit rods (32) pass through the base (1) and are slidably connected to the base (1). The multiple springs (33) are sleeved on the outside of the limit rods (32). The two ends of the springs (33) are fixedly connected to the base (1) and the base plate (31) respectively. The multiple car reducer housings (34) are fixedly installed at the upper end of the base plate (31). The multiple air pressure sensors (35) are fixedly installed on the inner side of the car reducer housings (34). The upper end of the car reducer housings (34) is provided with threaded holes for fixing with plugs. The inner side of the car reducer housings (34) is connected to the air supply equipment through a pipe. The air pressure sensors (35) are electrically connected to the airtightness tester.

8. The airtightness testing device for automotive reducer sealing plugs according to claim 1, characterized in that, Multiple material distribution devices (4) are arranged in a front-to-back arrangement. Each material distribution device (4) includes a material distribution trough (41), a partition (42), a baffle (43), and a servo motor (44). The material distribution trough (41) is fixedly installed on the base (1). The bottom of the material distribution trough (41) is inclined. The partition (42) is inclinedly fixedly installed on the inner side of the material distribution trough (41) to divide the material distribution trough (41) into upper and lower parts. The baffle (43) is rotatably installed on the inner side of the material distribution trough (41). The baffle (43) is located in the middle of the partition (42). The baffle (43) is in contact with the partition (42). The partition (42) has a through groove to accommodate the baffle (43). One side of the baffle (43) is fixedly connected to the output end of the servo motor (44). The servo motor (44) is fixedly installed on the outer side of the material distribution trough (41).

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