A pre-compression feeding test device for a round baler

Abstract

The utility model relates to a kind of round bale press pre-press feeding test device, belong to pasture harvesting machinery field, can improve feeding efficiency and bale density, to some extent solve the problem of round bale press feeding time leakage, plugging.A kind of round bale press pre-press device before feeding, including frame, angle adjustable feeding assembly, material stirring pre-press component, lead screw, position adjustment motor group, pressure sensor.The utility model's material stirring pre-press component acts on the bulk material of bunker conveying, and the bulk material plays shaping and packing effect, reduces leakage rate, improves feeding efficiency and bale uniformity;Feeding conveyor belt sets four position adjustable support roller, realizes the adjustment function of feeding angle, feeding curve, to adapt to different kinds of materials, operating requirement of working condition;The size of pre-pressure is detected by pressure sensor, simultaneously to timing control transmission lead screw, realizes the adjustment of pre-press degree in different stages of baling.

Description

Technical Field

[0001] This utility model relates to a pre-compression feeding test device for a round baler, belonging to the field of forage harvesting machinery. Background Technology

[0002] In modern agricultural production, silage production is a crucial step, impacting not only the sustainable development of animal husbandry but also the health and productivity of livestock. Silage baling technology improves silage quality through sealed packaging, reduces losses during storage and transportation, effectively maintains freshness and nutritional value, and increases feed utilization. Traditional round balers are prone to leakage during silage production due to the fluidity and irregularity of the loose material. Blockages during compression reduce machine efficiency and cause malfunctions. Pre-compression, the initial compression before feeding, increases the density of the loose material, making it easier to form a uniform compressed structure, reducing leakage and blockages, improving silage quality and stability, and lowering machine maintenance costs.

[0003] During pre-compaction, adjusting the feeding path and pre-pressure intensity is crucial. Adjusting the feeding path ensures that the bulk material is evenly distributed when entering the pre-compaction zone, avoiding blockages caused by localized over-density or sudden changes in stress. Simultaneously, appropriate pre-pressure intensity ensures both the compactness of the bulk material and avoids excessive feeding resistance, which could negatively impact silage quality and feeding efficiency. Utility Model Content

[0004] The purpose of this invention is to address the feeding problems caused by traditional round silage wrapping machines by providing a low-cost, simple-structured testing device with pre-compression function and adjustable angle, in order to solve the problems of material leakage, blockage, low feeding efficiency, and uneven bale formation during feeding of traditional round balers.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A pre-compression feeding test device for a round baler includes a frame, an angle-adjustable feeding assembly, a feeding pre-compression assembly, a lead screw assembly, a position adjustment motor assembly, a slider, and a chain drive assembly; The angle-adjustable feeding assembly, the feeding pre-compression assembly, and the lead screw assembly are all mounted on the frame; the feeding pre-compression assembly is positioned above the angle-adjustable feeding assembly; the lead screw assembly consists of four lead screws, which are connected to the feeding pre-compression assembly via sliders; the position adjustment motor controls the operation of the chain drive assembly; the position adjustment motor controls the operation of the lead screw assembly.

[0006] The frame includes a profile frame and side plates; both the profile frame and side plates are fixed components; the profile frame is assembled from 50×50 aluminum profiles; the profile frame consists of a chassis and four sets of vertical beams arranged along the long side of the chassis, where the vertical beams on one side are shorter, and the other three adjacent sets of vertical beams are taller and of equal height; the side plates are slotted; the side where the shorter vertical beam is located is defined as the rear side, and the four sets of vertical beams are numbered from the front to the rear side as the first to the fourth set; the first, second, and third sets of vertical beams are connected by upper and lower transverse beams for support, and are referred to as the first, second, and third sets of transverse beams; the fourth set of vertical beams is located at the outlet of the pre-compressed material, and to avoid affecting subsequent feeding operations, no transverse beams are installed in between.

[0007] To allow sufficient space for material feeding, the height of the first, second, and third sets of vertical beams in the profile frame shall not be less than 700mm, and the height of the fourth set of vertical beams shall not be less than 550mm; a gap shall be left between the profile frame chassis and the ground, and its height shall not be less than the length of the pressure sensor along the force direction; the side plate shall be 550mm high, 4mm thick, and its length shall be determined according to the gap of each set of vertical beams; circular end slots shall be opened on the side plate, and the distance between the centers of the two ends of the slot shall not be less than 300mm.

[0008] The path-adjustable feeding assembly includes a belt shaft, support rollers, and a conveyor belt, and is equipped with mounting bearing seats and rolling bearings. Four conveyor belt support bars are fixed to the side plates via the bearing seats. Adjusting the installation position of the belt shaft in the side plate grooves adjusts the feeding angle and feeding curve of the conveyor belt. The support rollers are welded to the belt shaft, directly supporting the conveyor belt. A drive motor is mounted on the conveyor belt support bars connected to the first set of vertical beams, serving as the drive shaft to drive the conveyor belt and transport material from the front to the rear. Roller patterns are applied to the support rollers to improve transmission capacity. Related technologies generally use a linear conveying device combined with an angle adjustment device for feeding. This application uses a path adjustment combined with angle adjustment design, which better utilizes the different mechanical properties of various curves for testing. When the angle-adjustable feeding assembly is installed on the frame, the installation position of the belt shaft in the side plate grooves can be adjusted, allowing the conveyor belt to be adjusted within a certain angle range, and forming or approximately forming specific curves that affect the material feeding effect, including but not limited to: 1) A straight line, forming an angle between itself and the ground ranging from -15° to 15°; 2) Parametric equation curve, the equation is as follows: The feeding and pre-compression assembly includes a feeding roller and a pre-compression roller. The feeding roller is installed above the first set of vertical beams of the profile frame. The feeding roller consists of a drive shaft and a roller body machined on the drive shaft to perform the feeding action. One set of pre-compression rollers is installed above the second and third sets of vertical beams. The feeding roller can gather materials from both sides towards the center and initially level the fed material. The linear velocity of the pre-compression roller is the same as the linear velocity of the side of the conveyor belt in contact with the material. When the feeding roller needs to gather the material towards the center, its direction is adjusted to be opposite to that of the pre-compression roller. When the feeding roller needs to move the material from the center to both sides, its direction is adjusted to be the same as that of the pre-compression roller. The feeding roller body has spiral auger-type feeding devices on both sides, which can feed the material from both ends of the hopper. The material is gathered towards the center; a keyway is machined on one side of the feed roller drive shaft to facilitate drive via a coupling and motor; the middle part of the feed roller body has multiple sets of plate-shaped feed devices installed side by side along the roller body axis, which can initially flatten the material in the middle part before pre-pressing; since there is no space to install a drive motor due to the lead screws on both sides of the pre-pressing roller, the pre-pressing roller adopts a power roller with a herringbone-shaped boss-shaped rubber coating on the surface and equipped with a motor inside; the number of herringbone bosses is not less than 3, and the height is not less than 0.1 times the radius of the pre-pressing roller (excluding the bosses); the axial direction of a single herringbone boss is along the spiral direction, and the lead range of the spiral is 510-860mm. This rubber coating design can further enhance the pre-pressing effect.

[0009] The chain drive assembly includes a first driving wheel, a second driving wheel, a first driven wheel group, a second driven wheel group, and a chain; wherein, the two driven wheel groups must each use identical sprockets to ensure the consistency of the screw's displacement in the vertical direction.

[0010] The position adjustment motor unit contains two motors; Motor 1 is fixed to the first set of transverse beams, controls the rotation of the first drive wheel, drives the first driven wheel set via chain transmission, so that the two lead screws connected to the first driven wheel set rotate synchronously, driving the preload rollers on the second set of vertical beams to rotate; Motor 2 is fixed to the third set of transverse beams, controls the rotation of the second drive wheel, drives the second driven wheel set via chain transmission, so that the two lead screws connected to the first driven wheel set rotate synchronously, driving the preload rollers on the second set of vertical beams to rotate.

[0011] The slider is L-shaped with threaded holes, allowing it to be installed in conjunction with each lead screw in the lead screw assembly. The slider's shape design in this application not only serves transmission and connection functions but also provides space below the preload roller for easy experimental recording.

[0012] A test method for a pre-compression feeding test device for a round baler, characterized in that the method includes the following steps: According to the test requirements, the initial feeding speed and pre-compression height were determined, and the gap between the conveyor belt and the pre-compression roller was adjusted accordingly. Pressure sensors were arranged on the support rollers on the second and third sets of vertical beams to ensure that their axes were parallel to the axis of the pre-compression roller and that the plane formed by the two straight lines was perpendicular to the horizontal plane. Start the conveyor belt to feed the material from the front of the test device. Start the position adjustment motor set to adjust the rotation of the feeding roller and the pre-compression roller to the required test speed. When the pre-compression roller applies pre-compression to the material, the pressure is transmitted downward and finally acts on the pressure sensor, increasing the output analog quantity. Set a preset value for the above analog quantity. When the analog quantity output value is greater than a certain preset value, the position adjustment motor set works to drive the pre-compression roller to move upward a certain distance to reduce the pre-compression gap. The position adjustment motor unit is timed. When the analog quantity output by the pressure sensor reaches the set value for the first time, the feeding time is started. If the analog quantity does not reach the set value within the set time interval, the position adjustment motor unit is activated to drive the pre-pressure roller to move downward a certain distance. When the feeding time reaches a certain value, the position adjustment motor unit is activated to drive the pre-pressure roller to move to the highest point of the allowed stroke. At the same time, the position adjustment motor unit is stopped, thereby stopping the feeding roller and the pre-pressure roller. The advantages of this utility model are: 1. Low cost and simple structure. It uses common aluminum profiles and other materials, and the overall structural design is simple, which reduces the manufacturing cost and maintenance difficulty. It provides a set of experimental devices for the research of pre-compression feeding of round balers, which helps to solve the problems of material leakage, material blockage, low feeding efficiency and uneven bale formation during feeding of traditional round balers, and improves the overall performance of the feeding process of round balers. 2. The angle-adjustable feeding assembly can adjust the feeding angle of the conveyor belt by adjusting the installation position of the belt shaft on the side plate groove. It can also form or approximately form a specific curve. By combining path adjustment and angle adjustment, it can better utilize the different mechanical properties of various curves to carry out experiments. Compared with the traditional linear conveyor combined with the angle adjustment device, it has stronger experimental adaptability. 3. In the test method, the position of the pre-compression roller is controlled by the analog quantity fed back by the pressure sensor, realizing intelligent adjustment of the pre-compression process. The position adjustment motor group is time-controlled. According to the analog quantity output by the pressure sensor and the feeding time, the movement and stopping of the pre-compression roller are precisely controlled, so that the entire test process can be carried out according to the preset requirements, improving the accuracy and repeatability of the test. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural schematic diagram of the pre-compression feeding test device for the round baler of this utility model; Figure 2This is a front view structural schematic diagram of the pre-compression feeding test device for the round baler of this utility model; Figure 3 This is a schematic diagram of the structure of the feeding roller of this utility model; Figure 4 This is a schematic diagram of the structure of the preload roller of this utility model; Figure 1-4 The following are the labels: 1-Frame, 101-Profile frame, 102-Side plate, 2-Angle adjustable feeding assembly, 201-Belt shaft, 202-Support roller, 203-Conveyor belt, 3-Material feeding and pre-pressing assembly, 301-Material feeding roller, 302-Pre-pressing roller, 4-Screw assembly, 5-Position adjustment motor assembly, 6-Slider, 7-Chain drive assembly, 701-First drive wheel, 702-Second drive wheel, 703-First driven wheel assembly, 704-Second driven wheel assembly, 705-Chain. Detailed Implementation

[0014] The specific embodiments of this utility model will be described below with reference to the accompanying drawings and specific implementation scenarios.

[0015] like Figure 1 , 2 As shown, a pre-compression feeding test device for a round baler includes a frame 1, an angle-adjustable feeding assembly 2, a feeding pre-compression assembly 3, a lead screw assembly 4, a position adjustment motor assembly 5, a slider 6, and a chain drive assembly 7. The angle-adjustable feeding assembly 2, the feeding pre-pressing assembly 3, and the lead screw assembly 4 are all mounted on the frame 1; the feeding pre-pressing assembly 3 is positioned above the angle-adjustable feeding assembly 2; the lead screw assembly 4 includes four lead screws, which are connected to the pre-pressing roller 302 in the feeding pre-pressing assembly 3 via a slider 6; the position adjustment motor controls the operation of the chain drive assembly; the position adjustment motor controls the operation of the lead screw assembly.

[0016] The frame includes a profile frame 101 and side plates 102; both the profile frame 101 and the side plates 102 are fixed components; the profile frame 101 is spliced ​​from 50×50 aluminum profiles; the profile frame 101 consists of a chassis and four sets of vertical beams arranged along the long side of the chassis, wherein the vertical beams on one side are shorter, and the other three adjacent sets of vertical beams are taller and of equal height; the side plates 102 are slotted; the side where the shorter vertical beam is located is defined as the rear side, and the four sets of vertical beams are numbered from the front side to the rear side as the first to the fourth group; the first, second, and third groups of vertical beams are connected by upper and lower transverse beams for support; the fourth group of vertical beams is located at the outlet of the pre-compressed material, and no transverse beams are set in between to avoid affecting subsequent feeding operations.

[0017] To allow sufficient space for material feeding, the height of the first, second, and third sets of vertical beams of the profile frame 101 is not less than 700mm, and the height of the fourth set of vertical beams is not less than 550mm; the height of the side plate 102 is 550mm, the thickness is 4mm, and the length is determined according to the gap of each set of vertical beams; a circular end groove is opened on the side plate 102, and the distance between the centers of the two ends of the groove is not less than 300mm.

[0018] The path-adjustable feeding assembly 2 includes a belt shaft 201, support rollers 202, and a conveyor belt 203, and is equipped with bearing seats and rolling bearings for installation. The conveyor belt 203 has four support bars, which are fixed to the side plate 102 via the bearing seats. By adjusting the installation position of the belt shaft 201 in the groove of the side plate 102, the feeding angle and feeding curve of the conveyor belt can be adjusted. The support rollers 202 are welded to the belt shaft 201 and directly support the conveyor belt 203. A drive motor is configured on the support bars of the conveyor belt 203 connected to the first set of vertical beams, which serves as the drive shaft to drive the conveyor belt 203 to transport materials from the front to the rear. Roller patterns are applied to the support rollers 202 to improve transmission capacity. While related technologies generally employ a linear conveying device combined with an angle adjustment device for feeding, this application uses a design that combines path adjustment with angle adjustment, which allows for better utilization of the different mechanical properties of various curves for testing. When the angle-adjustable feeding assembly is installed on the frame, the installation position of the belt shaft 201 in the groove of the side plate 102 can be adjusted, allowing the conveyor belt 203 to be adjusted within a certain angle range. This adjustment can create or approximately create a specific curve that affects the material feeding effect, including but not limited to: 1) A straight line, forming an angle between itself and the ground ranging from -15° to 15°; 2) Parametric equation curve, the equation is as follows: Preferably, when a round bundle baler is connected after this experimental device for test operations, the shape of the conveyor belt 203 is adjusted to approximately the shape of the curve described in 2). The feeding and pre-pressing assembly 3 includes a feeding roller 301 and a pre-pressing roller 302. The feeding roller 301 is installed above the first set of vertical beams of the profile frame. The feeding roller 301 consists of a drive shaft and a roller body machined on the drive shaft to perform the feeding action. One set of pre-pressing rollers 302 is installed above the second and third sets of vertical beams. The feeding roller 301 can gather materials from both sides towards the middle and initially level the fed material. The linear velocity of the pre-pressing roller 302 is the same as that of the conveyor belt 203 on the side in contact with the material. When the feeding roller 301 needs to gather the material towards the middle, its direction is adjusted to be opposite to that of the pre-pressing roller 302. When the feeding roller 301 needs to move the material from the middle to both sides, its direction is adjusted to be the same as that of the pre-pressing roller 302. The feeding roller 301 has spiral auger-type feeding devices on both sides of its roller body, which can... The material fed into the hopper is gathered from both ends towards the middle; a keyway is machined on one side of the drive shaft of the feeding roller 301 to facilitate drive through a coupling and a motor or other drive device; the middle part of the feeding roller 301 has multiple sets of plate-shaped feeding devices installed side by side along the roller body axis, which can initially flatten the material in the middle part before pre-pressing; since there is no space to install a drive motor due to the lead screws on both sides of the pre-pressing roller 302, the pre-pressing roller 302 is a power roller with a herringbone-shaped boss-shaped rubber coating on the surface and an internal motor; the number of herringbone bosses is not less than 3, and the height is not less than 0.1 times the radius of the pre-pressing roller 302 (excluding the bosses); the axial direction of a single herringbone boss is along the spiral direction, and the lead of the spiral is 510-860mm. This rubber coating design can further enhance the pre-pressing effect.

[0019] The chain drive assembly 7 includes a first driving wheel, a second driving wheel, a first driven wheel group, a second driven wheel group, and a chain; wherein, the two driven wheel groups must each use identical sprockets to ensure the consistency of the screw displacement in the vertical direction.

[0020] The position adjustment motor unit 5 contains two motors; motor one is fixed to the first set of transverse beams, controls the rotation of the first driving wheel, drives the first driven wheel set via chain transmission, so that the two lead screws connected to the first driven wheel set rotate synchronously, driving the preload roller 302 on the second set of vertical beams to rotate; motor two is fixed to the third set of transverse beams, controls the rotation of the second driving wheel, drives the second driven wheel set via chain transmission, so that the two lead screws connected to the first driven wheel set rotate synchronously, driving the preload roller 302 on the second set of vertical beams to rotate.

[0021] The slider 6 is L-shaped with threaded holes, allowing it to be installed in conjunction with each lead screw in the lead screw assembly 4. The design of the slider 6 in this application not only serves transmission and connection functions but also provides space below the preload roller 302 for convenient test recording.

[0022] like Figure 1 , 2As shown in Figures 3 and 4, the material feeding and pre-compression assembly 3 includes a feeding roller 301 and a pre-compression roller 302. The feeding roller 301 is installed above the first set of vertical beams of the profile frame. The feeding roller 301 consists of a drive shaft and a roller body welded to the drive shaft. One set of pre-compression rollers 302 is installed above the second and third sets of vertical beams. The feeding roller 301 can gather the material on both sides towards the middle and initially level the fed material. The feeding roller 301 and the pre-compression roller 302 rotate in the same direction as the conveyor belt 203. Spiral auger-type feeding devices are installed on both sides of the feeding roller 301 to gather the two ends of the material fed into the hopper towards the middle. Multiple sets of plate-type feeding devices are installed side by side along the roller body axis in the middle part of the feeding roller 301 to initially level the material in the middle part before pre-compression. In related technologies, the roller surface is generally not designed during compression tests. In this design, the preload roller 302 is a hollow steel roller with herringbone bosses on the surface. The number of herringbone bosses is not less than 3, and the height is not less than 0.2 times the radius of the preload roller 302 (excluding the bosses). The axial direction of a single herringbone boss is along the spiral direction, and the lead of the spiral is 510 to 860 mm. This design can further enhance the preload effect under the premise of similar processing cost.

[0023] The position adjustment motor assembly contains two motors; The motor is fixed to the first set of transverse beams and controls the rotation of the first drive wheel 701. The first driven wheel set 703 is driven by the chain 705, so that the two lead screws connected to the first driven wheel set 703 rotate synchronously, driving the preload roller 302 on the second set of vertical beams to move. The second motor is fixed to the third set of transverse beams, controlling the rotation of the second drive wheel 702. The second driven wheel set 704 is driven by the chain 705, causing the two lead screws connected to the first driven wheel set 703 to rotate synchronously, which in turn drives the preload roller 302 on the second set of vertical beams to move.

[0024] A test method for a pre-compression feeding test device for a round baler includes the following steps: S1. According to the test requirements, determine the initial feeding speed and pre-compression height, and adjust the gap between the conveyor belt 203 and the pre-compression roller 302 accordingly. Arrange pressure sensors on the support rollers 202 on the second and third sets of vertical beams to ensure that their axes are parallel to the axis of the pre-compression roller 302 and that the plane formed by the two straight lines is perpendicular to the horizontal plane. S2. Start the conveyor belt 203 to feed the material from the front of the test device. Start the position adjustment motor 5 and adjust it to make the feeding roller 301 and the pre-pressure roller 302 rotate to the required speed for the test. When the pre-pressure roller 302 applies pre-pressure to the material, the pressure will be transmitted downward and finally act on the pressure sensor, increasing the output analog quantity. Set a preset value for the above analog quantity. When the analog quantity output value is greater than a certain preset value, the position adjustment motor 5 will work to drive the pre-pressure roller 302 to move upward a certain distance to reduce the pre-pressure gap. S3. Perform timing control on the position adjustment motor group 5. When the analog quantity output by the pressure sensor reaches the set value for the first time, start timing the feeding time. If the analog quantity does not reach the set value within the set time interval, make the position adjustment motor group 5 work to drive the pre-pressure roller 302 to move downward a certain distance. When the feeding time reaches a certain value, make the position adjustment motor group 5 work to drive the pre-pressure roller 302 to move to the highest point of the allowed stroke, and at the same time make the position adjustment motor group 5 stop working, thereby making the feeding roller 301 and the pre-pressure roller 302 stop working.

Claims

1. A pre-compression feeding test device for a round baler, characterized in that: The system includes a frame (1), an angle-adjustable feeding assembly (2), a feeding pre-compression assembly (3), a lead screw assembly (4), a position adjustment motor assembly (5), a slider (6), and a chain drive assembly (7). The angle-adjustable feeding assembly (2), the feeding pre-compression assembly (3), and the lead screw assembly (4) are all mounted on the frame (1). The feeding pre-compression assembly (3) is positioned above the angle-adjustable feeding assembly (2). The lead screw assembly (4) consists of four lead screws, which are connected to the feeding pre-compression assembly (3) via the slider (6). The position adjustment motor assembly (5) drives the chain drive assembly (7) to operate, thereby controlling the operation of the lead screw assembly (4). The angle-adjustable feeding assembly (2), the feeding pre-compression assembly (3), the lead screw assembly (4), and the chain drive assembly (7) are all mounted on the frame (1). Component (2) includes a belt shaft (201), a support roller (202), and a conveyor belt (203); there are four belt shafts (201), which are fixed to the side plate (102) through bearing seats (204); by adjusting the installation position of the belt shafts (201) on the groove of the side plate (102), the feeding angle and feeding curve of the conveyor belt can be adjusted; the support rollers (202) are fixed to the belt shafts (201) and directly support the conveyor belt (203); the conveyor belt (203) transports the material from the front to the rear; the belt shafts (201) connected to the first set of vertical beams are equipped with power, while the support rollers (202) connected to the second, third, and fourth sets of vertical beams are not equipped with power.

2. The pre-compression feeding test device for a round baler according to claim 1, characterized in that: The feeding and pre-pressing assembly (3) includes a feeding roller (301) and a pre-pressing roller (302). The feeding roller (301) is installed on the upper part of the first set of vertical beams of the profile frame (101). The feeding roller (301) is composed of a drive shaft and a roller body welded to the drive shaft. One set of pre-pressing rollers (302) is installed on the upper part of the second and third sets of vertical beams. The axes of the pre-pressing rollers (302) and the support rollers (202) on each set of vertical beams are parallel and the plane formed is perpendicular to the horizontal plane. The support rollers (202) connected to the second and third sets of vertical beams are not equipped with power and are equipped with pressure sensors on the top surface. The feeding rollers (301) gather the materials on both sides to the middle and initially flatten the fed materials. The feeding rollers (301) and the pre-pressing rollers (302) rotate in the same direction as the conveyor belt (203).

3. The pre-compression feeding test device for a round baler according to claim 1, characterized in that: The height of the first, second and third vertical beams of the profile frame (101) is not less than 700mm, and the height of the third vertical beam is not less than 550mm; the height of the side plate (102) is 550mm, the thickness is 4mm, and the length is determined according to the gap of each group of vertical beams; the side plate (102) has a circular end groove, and the distance between the center of the two ends of the groove is not less than 420mm.

4. The pre-compression feeding test device for a round baler according to claim 1, characterized in that: When the angle-adjustable feeding assembly (2) is installed on the frame (1), the installation position of the belt shaft (201) on the groove of the side plate (102) is adjusted so that the conveyor belt (203) can be adjusted within a certain angle range to form a specific conveying curve.

5. The pre-compression feeding test device for a round baler according to claim 1, characterized in that, The feeding roller (301) has reverse spiral auger-type feeding devices installed on both sides of the roller body, which can gather the two ends of the material fed into the hopper towards the middle; the feeding roller (301) has multiple sets of plate-type feeding devices installed in parallel along the roller body axis in the middle part of the roller body, which can preliminarily flatten the material in the middle part before pre-pressing.

6. The pre-compression feeding test device for a round baler according to claim 1, characterized in that, The preload roller (302) is a hollow steel roller with herringbone bosses on its surface; the number of herringbone bosses is not less than 3, and the height is not less than 0.2 times the radius of the preload roller; the axial direction of a single herringbone boss is along the spiral direction, and the lead range of the spiral is 510 to 860 mm; the slider (6) is L-shaped and has threaded holes, which can be installed in conjunction with each screw in the screw assembly (4).

7. The pre-compression feeding test device for a round baler according to claim 1, characterized in that, The position adjustment motor group (5) contains two motors; one motor is fixed on the first set of transverse beams, controls the rotation of the first driving wheel (701), drives the first driven wheel group (703) through the chain (705), so that the two lead screws connected to the first driven wheel group (703) rotate synchronously, and drive the preload roller (302) on the second set of vertical beams to move.

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