Round bale machine rear door control hydraulic system and agricultural machinery

Abstract

The utility model relates to the field of agricultural machinery hydraulic control, and specifically relates to a round bale machine back door control hydraulic system and agricultural machine, the first oil way is connected between the first oil port of tractor master control valve and the rodless cavity of back door oil cylinder, the second oil way is connected between the second oil port of tractor master control valve and the rod cavity of back door oil cylinder, the bidirectional filter includes first filter module and second filter module, first filter module sets up on the first oil way, is used for carrying out the filtration to the hydraulic oil of entering the rodless cavity of back door oil cylinder, second filter module sets up on the second oil way, is used for carrying out the filtration to the hydraulic oil of entering the rod cavity of back door oil cylinder, its solve the problem that the oil of back door oil cylinder is not passed through effective filtration in the process of stretching out and retracting in prior art, thereby the key components in protection system, prolong the service life of equipment.

Description

Technical Field

[0001] This utility model relates to the field of agricultural machinery hydraulic control, specifically to a hydraulic system for controlling the rear door of a round baler and agricultural machinery. Background Technology

[0002] Round balers are widely used agricultural machinery, primarily for compressing and automatically bundling materials such as crop stalks and hay into bales for easier transportation and storage. During operation, the opening and closing of the rear door is typically controlled by a hydraulic system, with the rear door cylinder being a key actuator that directly impacts the machine's efficiency and reliability.

[0003] Existing hydraulic systems for controlling the rear door of round balers typically include a hydraulic pump, a main control valve (tractor main control valve), and a rear door cylinder. In actual use, the working medium (hydraulic oil) in the hydraulic system is inevitably contaminated by impurities from the external environment or internal wear. If these impurities enter critical components of the system, such as the main control valve and rear door cylinder, along with the hydraulic oil, they can easily cause problems such as valve core jamming, seal wear, and oil circuit blockage, thereby affecting the system's control accuracy and service life, and even leading to equipment failure.

[0004] Especially during the operation of the rear door hydraulic cylinder, if the incoming oil is not effectively filtered when the cylinder extends or retracts, impurities may directly enter the cylinder interior and rub against critical components such as the piston rod and seals. This can lead to premature wear of the seals, resulting in internal leakage and adverse consequences such as sluggish cylinder movement, pressure drop, and reduced work efficiency. Furthermore, the accumulation of impurities can also affect the normal operation of the main control valve and other hydraulic components, increasing maintenance frequency, failure rate, and overall operating costs.

[0005] While some existing hydraulic systems incorporate filtration devices, most are unidirectional filtration structures, filtering oil only from one direction. This makes it difficult to achieve comprehensive impurity control during bidirectional cylinder movement, resulting in limited filtration effectiveness. Therefore, there is an urgent need for a hydraulic system structure capable of effective filtration in both the extension and retraction of the rear cylinder, thereby improving system stability and reliability and extending equipment lifespan.

[0006] In summary, the existing technology lacks a round baler rear door control hydraulic system that is structurally sound, provides comprehensive filtration, and effectively protects key components in the hydraulic system, especially in terms of bidirectional filtration function. Utility Model Content

[0007] The purpose of this utility model is to provide a hydraulic control system for the rear door of a round baler, which aims to solve the problem that the oil entering the rear door cylinder during the extension and retraction process is not effectively filtered in the prior art, thereby protecting the key components of the system and extending the service life of the equipment.

[0008] Another objective of this invention is to provide an agricultural machine that addresses the problem in the prior art where the oil entering the rear door cylinder during extension and retraction is not effectively filtered, thereby protecting key components in the system and extending the service life of the equipment.

[0009] The technical solution of this utility model is implemented as follows:

[0010] A hydraulic control system for the rear door of a round baler includes a tractor main control valve and a rear door cylinder, wherein the rear door cylinder is used to drive the opening and closing action of the rear door of the round baler, and further includes:

[0011] The first oil circuit and the second oil circuit are connected, with the first oil port of the tractor main control valve connected to the rodless chamber of the rear door cylinder, and the second oil port of the tractor main control valve connected to the rod chamber of the rear door cylinder.

[0012] The bidirectional filter includes a first filter module and a second filter module. The first filter module is disposed on the first oil circuit and is used to filter the hydraulic oil entering the rodless chamber of the rear door cylinder. The second filter module is disposed on the second oil circuit and is used to filter the hydraulic oil entering the rod chamber of the rear door cylinder.

[0013] Furthermore, the first filtration module includes a first filter element, a first bypass valve, and a first return oil check valve arranged in parallel with each other;

[0014] The second filtration module includes a second filter element, a second bypass valve, and a second return oil check valve arranged in parallel with each other;

[0015] The first filter element and the second filter element are used for oil inlet filtration when the rear door cylinder extends and retracts, respectively.

[0016] Furthermore, the first filtration module also includes a first oil inlet check valve, which is located at the rear end of the first filter element.

[0017] Furthermore, the second filtration module also includes a second oil inlet check valve, which is located at the rear end of the second filter element.

[0018] Furthermore, it also includes a shut-off valve, which is disposed between the tractor main control valve and the first filter module.

[0019] Furthermore, it also includes a hydraulic lock, which is disposed between the bidirectional filter and the rear door cylinder, and is used to prevent hydraulic oil backflow and lock the rear door cylinder in the non-working state.

[0020] Furthermore, it also includes an overload pipeline, which is connected between the first oil circuit and the second oil circuit. An overload valve is installed on the overload pipeline. The overload valve opens when the rear door of the round baler is fully closed and the system pressure increases, in order to prevent the system pressure from being too high.

[0021] Furthermore, the tractor main control valve controls the extension and retraction of the rear door cylinder. By manipulating the tractor main control valve to switch the oil circuit direction, the opening and closing control of the rear door is achieved.

[0022] Furthermore, the rear door hydraulic cylinder is provided in two synchronized cylinders, which are used to jointly drive the opening and closing action of the rear door of the round baler.

[0023] An agricultural machine, including the hydraulic system for controlling the rear door of the round baler.

[0024] Compared with the prior art, the beneficial effects of this utility model are:

[0025] This application provides a hydraulic control system for the rear door of a round baler. A two-way filter is installed between the main control valve and the rear door cylinder. The two-way filter filters the oil entering the rear door cylinder during extension and retraction through two filter modules (a first filter module and a second filter module), thereby preventing impurities from entering the interior of other components in the system and protecting them. At the same time, it prevents impurities in the oil from entering the rear door cylinder, thereby protecting the seals inside the rear door cylinder and preventing serious internal leakage due to excessive wear of the seals inside the rear door cylinder. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the hydraulic system for controlling the rear door of the round baler of this utility model;

[0028] Figure 2 This is a diagram showing the oil flow direction when the rear door cylinder of this utility model is extended.

[0029] Figure 3 This is a diagram showing the oil flow direction when the rear door cylinder of this utility model is in the retracted state;

[0030] Figure 4 This is a schematic diagram of the bidirectional filter of this utility model.

[0031] In the picture:

[0032] 1-Tractor main control valve; 2-Stop valve; 3-Two-way filter;

[0033] 3B - Second filter module; 301 - Second bypass valve; 302 - Second return oil check valve; 303 - Second inlet oil check valve; 304 - Second filter element;

[0034] 3A - First filter module; 305 - First bypass valve; 306 - First return oil check valve; 307 - First inlet oil check valve; 308 - First filter element;

[0035] 4-Hydraulic lock; 5-Overload valve; 6-Rear door cylinder; 7-First oil circuit; 8-Second oil circuit. Detailed Implementation

[0036] 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 embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0037] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0038] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0039] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0040] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0041] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0042] The following detailed description, in conjunction with the accompanying drawings, outlines some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0043] Example 1

[0044] In agricultural machinery, a round baler is a device used to bale crop stalks (such as wheat straw and corn stalks) into round bales, and is widely used in agricultural production. These devices are typically powered by a tractor and control various working parts through a hydraulic system. The "rear door" is a key component, responsible for opening and closing to complete the unloading action after baling.

[0045] Traditional hydraulic systems have some problems when controlling the opening and closing of the rear door, such as:

[0046] 1. Impurities may be present in the hydraulic oil, which can easily cause critical components such as hydraulic valves and cylinders to jam or wear.

[0047] 2. Poor oil cleanliness will shorten equipment life and increase the failure rate;

[0048] 3. For certain actions that require "pressure maintenance" (such as maintaining a certain pressure after the back door is closed to prevent loosening), the traditional system control is not precise enough.

[0049] In response to the above issues, such as Figures 1-4 As shown, this embodiment provides a hydraulic system for controlling the rear door of a round baler, including a hydraulic pump, a tractor main control valve 1, a rear door cylinder 6, and a two-way filter 3. The hydraulic pump is connected to the main control valve via an oil pipe. The main control valve is connected to the extended end and retracted end of the rear door cylinder 6 via two oil circuits (a first oil circuit 7 and a second oil circuit 8), respectively. Specifically:

[0050] The first oil port of the tractor main control valve 1 is connected to the rodless chamber of the rear door cylinder 6 via a first oil circuit 7, and the second oil port of the tractor main control valve 1 is connected to the rod chamber of the rear door cylinder 6 via a second oil circuit 8.

[0051] A two-way filter 3 is disposed between the main control valve and the rear door cylinder 6. Specifically, the two-way filter 3 includes a first filter module 3A and a second filter module 3B. The first filter module 3A is connected to the first oil passage 7 between the main control valve and the extended end of the rear door cylinder 6, and is used to filter the hydraulic oil entering the rodless chamber of the rear door cylinder 6. The second filter module 3B is connected to the second oil passage 8 between the main control valve and the retracted end of the rear door cylinder 6, and is used to filter the hydraulic oil entering the rod chamber of the rear door cylinder 6.

[0052] Specifically, the first filtration module 3A includes a first filter element 308, a first bypass valve 305, and a first return oil check valve 306, which are arranged in parallel with each other.

[0053] The second filtration module 3B includes a second filter element 304, a second bypass valve 301, and a second return oil check valve 302, which are arranged in parallel with each other.

[0054] The first filter element 308 and the second filter element 304 are used for oil inlet filtration when the rear door cylinder 6 extends and retracts, respectively.

[0055] The first filter module 3A also includes a first oil inlet check valve 307, which is located at the rear end of the first filter element 308.

[0056] The second filter module 3B also includes a second oil inlet check valve 303, which is located at the rear end of the second filter element 304.

[0057] It also includes a shut-off valve 2, which is located between the tractor main control valve 1 and the first filter module 3A.

[0058] Both the first filter module 3A and the second filter module 3B use high-efficiency filter materials, such as microporous filter paper or metal mesh, which can effectively remove impurities from the hydraulic oil. Each filter module is also equipped with a bypass valve. When the filter element (first filter element 308 or second filter element 304) becomes clogged, causing abnormal system pressure, the corresponding bypass valve (first bypass valve 305 or second bypass valve 301) will automatically open, allowing the hydraulic oil to continue flowing around the filter element. At the same time, an alarm device is triggered to issue an alarm, reminding the operator to perform maintenance.

[0059] Specifically, the system also includes a pressure sensor to monitor pressure changes within the system. An alarm device (such as a siren) and the pressure sensor are electrically connected to the controller. When the pressure sensor detects an abnormal system pressure, it will issue an alarm through the alarm device to alert the operator to take timely action.

[0060] The system also includes a hydraulic lock 4, which is located between the bidirectional filter 3 and the rear door cylinder 6. It is used to prevent hydraulic oil backflow and lock the rear door cylinder 6 when not in operation.

[0061] The system also includes an overload pipeline. The overload pipeline is connected between the first oil line 7 and the second oil line 8. An overload valve 5 is installed on the overload pipeline. The overload valve 5 opens when the rear door of the round baler is fully closed and the system pressure increases, in order to prevent the system pressure from being too high.

[0062] The tractor's main control valve 1 controls the extension and retraction of the rear door cylinder 6. By manipulating the tractor's main control valve 1 to switch the direction of the oil circuit, the opening and closing of the rear door can be controlled.

[0063] In this embodiment, at least one rear door cylinder 6 is provided. Preferably, two rear door cylinders 6 are provided and are synchronous cylinders, with the two rear door cylinders 6 operating synchronously to jointly drive the opening and closing action of the rear door of the round baler. Specifically, the rear end branch of the first oil circuit 7 has two branches that are respectively connected to the rodless chamber of the two rear door cylinders 6, and the rear end of the second oil circuit 8 also has two branches that are respectively connected to the rod chamber of the two rear door cylinders 6, thereby realizing the synchronous operation of the two rear door cylinders 6.

[0064] The return oil path is equipped with a first return oil check valve 306 and a second return oil check valve 302, so that the return oil bypasses the filter element and returns directly to the tractor main control valve 1 and the oil tank, avoiding the return oil from contaminating the filter element, and reducing the system back pressure.

[0065] The bidirectional filter 3 structure filters the hydraulic oil entering the hydraulic lock 4, overload valve 5 and rear door cylinder 6, thereby improving the working reliability of hydraulic components and extending their service life.

[0066] The hydraulic system for controlling the rear door of the round baler is described below:

[0067] 1. Rear door cylinder 6 extended (e.g.) Figure 2 )

[0068] By operating the tractor's main control valve 1, pressurized oil (hydraulic oil) is output from the first port of the tractor's main control valve 1 to the shut-off valve 2, and then to the first filter module 3A of the two-way filter 3. At this time, the first return oil check valve 306 is in the closed state, and the first bypass valve 305 only opens when the first filter element 308 is severely clogged; it is also in the closed state under the action of spring force. Therefore, after being filtered by the first filter element 308, the pressurized oil continues to flow upward through the first inlet check valve 307. Under the action of the pressurized oil, the hydraulic lock 4 is forced to open, and at the same time, the pressurized oil reaches the rodless chamber (large chamber) of the rear door cylinder 6. Under the action of the pressurized oil, the piston rod of the rear door cylinder 6 extends outward, and the oil in the rod chamber (small chamber) of the rear door cylinder 6 returns to the hydraulic lock 4 through the oil circuit. At this time, the hydraulic lock 4 is in the open state, and the return oil passes through it to the two-way filter 3. At this time, the second inlet check valve 303 is closed, and the second bypass valve 301 is also closed. After the return oil opens the second return check valve 302, the return oil flows to the tractor main control valve 1 and then to the oil tank.

[0069] 2. Rear door cylinder 6 retracted state (e.g.) Figure 3 )

[0070] By operating the tractor control main valve 1, pressurized oil is output from the second port of the tractor main control valve 1 to the second filter module 3B of the two-way filter 3. At this time, the second return oil check valve 302 is in the closed state, and the second bypass valve 301 only opens when the second filter element 304 is severely clogged, and it is also in the closed state under the action of spring force. Therefore, after being filtered by the second filter element 304, the pressurized oil continues to flow upward through the second inlet oil check valve 303. After passing through the hydraulic lock 4, the pressurized oil reaches the rod chamber of the rear door cylinder 6. Under the action of the pressurized oil, the piston rod of the rear door cylinder 6 retracts, and the oil in the rodless chamber returns to the two-way filter 3 through the oil circuit. At this time, the first inlet oil check valve 307 is in the closed state, the first bypass valve 305 is also in the closed state, and the return oil returns to the tractor main control valve 1 after opening the first return oil check valve 306, and then to the oil tank.

[0071] When the rear door cylinder 6 retracts to the bottom, the tractor main control valve 1 needs to be controlled to continue to remain in the operating position to maintain the pressure. At this time, the pressure in the rod chamber of the rear door cylinder 6 increases significantly. In order to limit the pressure from being too high, an overload valve 5 is installed.

[0072] Through the above structural design, the hydraulic control system for the rear door of the round baler in this solution can effectively filter impurities in the hydraulic oil during the extension and retraction of the rear door cylinder 6, protect key components in the system, improve the stability and reliability of the system, and extend the service life of the equipment.

[0073] The main features of the rear door hydraulic control system designed in this scheme include:

[0074] 1. Control the rear door movement using the tractor's main control valve 1.

[0075] The system directly uses the tractor's own main control valve to operate the rear door cylinder 6, which simplifies the control logic and improves the system's compatibility and ease of operation.

[0076] 2. Introducing a "two-way filter 3" structure to ensure oil cleanliness.

[0077] This is the core innovation of this solution: a "two-way filter 3" is added to the system to achieve bidirectional filtration, filtering oil entering from both directions. It can filter the oil before it enters the rear door cylinder 6, ensuring that the oil entering the rear door cylinder 6 and related valves is clean. This filter has two directional filtration channels: one channel is used for filtering the oil entering when the rear door cylinder 6 extends, and the other channel is used for filtering the oil entering when the rear door cylinder 6 retracts. The return oil (i.e., the oil discharged from the rear door cylinder 6) returns directly to the oil tank through the first return oil check valve 306 or the second return oil check valve 302, bypassing the filter element and avoiding contamination of the filter element by the return oil.

[0078] In addition, when the filter element becomes clogged, the corresponding bypass valve will automatically open to prevent the system from malfunctioning due to filter element blockage.

[0079] 3. The combination of hydraulic lock 4 and overload valve 5 enhances safety and control precision.

[0080] Hydraulic lock 4: Prevents the rear door from falling suddenly during operation, serving as a locking mechanism. It can also prevent hydraulic oil backflow when not in operation, thereby locking the rear door cylinder 6 and improving safety.

[0081] Overload valve 5: After the rear door is fully closed, if pressure is continued to be applied, it will cause excessive pressure and damage the equipment. Overload valve 5 can release excess pressure and protect the system.

[0082] Example 2

[0083] An agricultural machine includes a tractor and a round baler used in conjunction with the tractor, the round baler having a rear door.

[0084] The agricultural machinery also includes the aforementioned hydraulic system for controlling the rear door of the round baler, in order to control the opening and closing of the rear door.

[0085] It should be noted that this hydraulic control system for round balers can be applied not only to round balers, but also to other agricultural implements used in conjunction with tractors, such as square balers, sprayers, pruning machines, and leaf combers.

[0086] The beneficial effects of the technical solution of this utility model are:

[0087] 1. High cleanliness: The two-way filter 3 effectively ensures the cleanliness of the oil entering key components, extending the equipment's lifespan;

[0088] 2. Stable control: The hydraulic lock 4 and overload valve 5 work together to improve the safety and reliability of operation;

[0089] 3. Reasonable structure: The system is simple in design, easy to maintain, and suitable for various round baling machines;

[0090] 4. Energy saving and environmental protection: Reduces failure rate, lowers maintenance frequency, and improves operation efficiency.

[0091] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the 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 or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

[0092] This is merely an embodiment and is not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A hydraulic control system for the rear door of a round baler, comprising a tractor main control valve (1) and a rear door cylinder (6), wherein the rear door cylinder (6) is used to drive the opening and closing action of the rear door of the round baler, characterized in that, Also includes: The first oil circuit (7) and the second oil circuit (8) are connected between the first oil port of the tractor main control valve (1) and the rodless chamber of the rear door cylinder (6), and the second oil circuit (8) is connected between the second oil port of the tractor main control valve (1) and the rod chamber of the rear door cylinder (6). The bidirectional filter (3) includes a first filter module (3A) and a second filter module (3B). The first filter module (3A) is disposed on the first oil circuit (7) and is used to filter the hydraulic oil entering the rodless chamber of the rear door cylinder (6). The second filter module (3B) is disposed on the second oil circuit (8) and is used to filter the hydraulic oil entering the rod chamber of the rear door cylinder (6).

2. The hydraulic system for controlling the rear door of the round baler according to claim 1, characterized in that, The first filtration module (3A) includes a first filter element (308), a first bypass valve (305), and a first return oil check valve (306) arranged in parallel with each other. The second filter module (3B) includes a second filter element (304), a second bypass valve (301), and a second return oil check valve (302) arranged in parallel with each other. The first filter element (308) and the second filter element (304) are used for oil inlet filtration when the rear door cylinder (6) extends and retracts, respectively.

3. The hydraulic system for controlling the rear door of the round baler according to claim 2, characterized in that, The first filter module (3A) further includes a first oil inlet check valve (307), which is located at the rear end of the first filter element (308).

4. The hydraulic system for controlling the rear door of the round baler according to claim 2, characterized in that, The second filter module (3B) also includes a second oil inlet check valve (303), which is located at the rear end of the second filter element (304).

5. The hydraulic system for controlling the rear door of the round baler according to claim 1, characterized in that, It also includes a shut-off valve (2), which is located between the tractor main control valve (1) and the first filter module (3A).

6. The hydraulic system for controlling the rear door of the round baler according to claim 1, characterized in that, It also includes a hydraulic lock (4), which is disposed between the bidirectional filter (3) and the rear door cylinder (6) to prevent hydraulic oil backflow and lock the rear door cylinder (6) in the non-working state.

7. The hydraulic system for controlling the rear door of the round baler according to claim 1, characterized in that, It also includes an overload pipeline, which is connected between the first oil line (7) and the second oil line (8). An overload valve (5) is provided on the overload pipeline. The overload valve (5) is opened when the rear door of the round baler is fully closed and the system pressure increases, in order to prevent the system pressure from being too high.

8. The hydraulic system for controlling the rear door of the round baler according to claim 1, characterized in that, The tractor main control valve (1) controls the extension and retraction of the rear door cylinder (6). By manipulating the tractor main control valve (1) to switch the oil circuit direction, the opening and closing control of the rear door can be realized.

9. The hydraulic system for controlling the rear door of the round baler according to claim 1, characterized in that, The rear door cylinder (6) is provided in two synchronous cylinders, which are used to jointly drive the opening and closing action of the rear door of the round baler.

10. An agricultural machine, characterized in that, Includes the hydraulic system for controlling the rear door of the round baler as described in any one of claims 1-9.

Images