An automatic film covering device for bundled straw

Abstract

This invention relates to the field of straw mulching technology, specifically to an automatic mulching device for the surface of straw bales, comprising a base, a mulching frame, and a conveying frame. The device is characterized by: a U-shaped mounting plate slidably mounted on the mulching frame, a power chamber on the U-shaped mounting plate; and multiple impact plates arranged in strips along the axial direction of the straw bales. In use, this automatic mulching device for straw bales achieves segmented adaptive pre-processing of the bale surface by adding axially arranged spring-loaded plates and impact plates at the front of the mulching frame. When a spring-loaded plate contacts an indestructible stone and is pushed to a preset displacement, a linked pressing unit drives the corresponding impact plate to press the foreign object into the bale with an instantaneous radial impact, eliminating the source of the thorn. Simultaneously, the cutting unit, through a bidirectional elastic blade-avoiding structure, allows the cutting strip to adaptively avoid indestructible hard objects according to the direction of the thorn's deflection.

Description

Technical Field

[0001] This invention relates to the field of straw mulching technology, specifically to an automatic mulching device for the surface of bundled straw. Background Technology

[0002] Straw mulching equipment is an agricultural machinery device that seals the outer surface of compressed cylindrical straw bales with a plastic film. Its core function is to continuously and tightly wrap the film around the cylindrical surface and both ends of the straw bale through a spiral winding process, forming a completely sealed layer. This prevents external oxygen from entering, allowing the straw to complete the bio-fermentation process dominated by lactic acid bacteria in an anaerobic environment. This transforms low-value agricultural waste into silage that can be stored for a long time and has excellent nutrition and flavor. The mulching equipment converts straw that would otherwise be burned on-site into commercially viable forage, taking into account both significant economic benefits and ecological environmental protection value.

[0003] In actual production, there are two process paths for compressing cylindrical straw bales. One is compression after crushing and shredding, where the straw is first cut and shredded into soft, fibrous strands before being bundled to meet the palatability and fermentation quality requirements for feed utilization. The other is direct compression of whole straw, omitting the crushing step and directly rolling whole straw collected from the field into the baling chamber for compression. This method primarily serves fuel and industrial raw material utilization scenarios, aiming for higher operational efficiency. The surface characteristics of the bales produced by these two paths differ significantly—the former has a smooth and delicate surface, resembling a smooth cylinder when covered with film; the latter retains… The complete stalk shape and sharp cuts result in a rough surface after forming, covered with hard stubble and slanted pointed ends. This type of straw bale, directly pressed from the whole stalk, presents a dilemma during film covering: the hard stubble easily punctures the film, causing seal failure; at the same time, this process inevitably mixes stones, clods of soil, and other foreign objects into the straw during field collection and pressing. These hard foreign objects lurking under the surface may puncture the film from the inside out during the rotating and pressing process of film covering, creating holes and affecting the sealing effect of the straw bale. To address this, we propose an automatic film covering device for the surface of straw bales after packing. Summary of the Invention

[0004] One of the technical problems this application aims to solve is that whole straw bales, when directly pressed together, face a dilemma during film covering: hard stubble can easily puncture the film, leading to seal failure; at the same time, this process inevitably mixes stones, clods of soil, and other foreign objects into the straw bales during field collection. These hard foreign objects lurking under the surface may puncture the film from the inside out during the rotating and pressing process of film covering, forming holes and thus affecting the sealing effect of the straw bales.

[0005] To address the aforementioned technical problems, this application provides an automatic film-coating device for the surface of bundled straw, comprising a base, a film-coating frame, and a film-conveying frame. A U-shaped mounting plate is slidably mounted on the film-coating frame, and a power chamber is provided on the U-shaped mounting plate. Multiple impact plates are provided on the power chamber, arranged in strips along the axial direction of the straw bundle. A detection chamber is mounted on the film-coating frame, and multiple spring-loaded plates are provided on the detection chamber, arranged in strips along the axial direction of the straw bundle, with each spring-loaded plate corresponding to one of the impact plates in the axial direction. A pressing unit connected to the impact plates is provided on the U-shaped mounting plate. When a spring-loaded plate detects a protruding stone on the surface of the straw bundle and is pushed by the stone, causing a preset displacement, it drives the corresponding impact plate to eject towards the surface of the straw bundle, applying a radially inward instantaneous impact force to the stone and pressing it into the interior of the straw bundle. A cutting unit is also provided on the U-shaped mounting plate to cut and separate the protruding spikes on the surface of the straw bundle.

[0006] In some embodiments, the pressing unit includes a detection element disposed on a detection chamber, which detects whether there are protruding stones on the surface of the straw bale. A trigger element is disposed in the detection chamber, which triggers the impact plate to work. A power element is disposed in the power chamber, which provides power for the impact plate to work. An impact element is disposed on the power chamber, which drives the impact plate to work.

[0007] In some embodiments, the detection component includes a U-shaped mounting plate slidably disposed on a film-coating frame. The mounting plate is connected to the power compartment and the detection compartment. A sliding shaft is slidably disposed on the detection compartment. A fixed plate is disposed inside the detection compartment. One end of the sliding shaft passes through the fixed plate and is slidably connected to the fixed plate. A limit plate is disposed on the sliding shaft. A trigger spring is sleeved on the sliding shaft between the fixed plate and the limit plate. A section of the sliding shaft located outside the detection compartment is connected to a spring pressure plate.

[0008] In some embodiments, the trigger includes a pneumatic chamber 1 disposed within a detection chamber, a piston plate 1 slidably disposed within the pneumatic chamber 1, the piston plate 1 being connected to a sliding shaft, and the sliding shaft being slidably connected to the pneumatic chamber 1. A pneumatic chamber 2 is disposed within a power chamber, the pneumatic chamber 1 being provided with a conduit, the conduit being connected to the pneumatic chamber 2 via a one-way exhaust valve, and the pneumatic chamber 1 being connected to the outside via a one-way intake valve. A piston plate 2 is slidably disposed within the pneumatic chamber 2, an extension rod being disposed on the piston plate 2, one end of the extension rod penetrating the pneumatic chamber 2 and slidably connected to the pneumatic chamber 2, and a return spring sleeved on one end of the extension rod located inside the pneumatic chamber 2.

[0009] In some embodiments, the power component includes a power storage chamber disposed within a power chamber, a piston plate three slidably disposed within the power storage chamber, a pressure spring disposed within the power storage chamber, two ends of the piston plate three being connected to the pressure spring and the inner wall of the power storage chamber respectively, a discharge port disposed at the bottom of the pneumatic chamber two, a discharge shaft slidably disposed on the piston plate two, a sealing block disposed at one end of the discharge shaft, the sealing block engaging with the discharge port, an iron plate disposed at the other end of the discharge shaft, a magnetic plate cooperating with the iron plate disposed at the top of the pneumatic chamber two, and a lifting plate disposed on the discharge shaft between the iron plate and the piston plate two.

[0010] In some embodiments, the impact member includes an impact rod slidably disposed on a power chamber, a positioning plate disposed within the power chamber, one end of the impact rod passing through the positioning plate and slidably connected to the positioning plate, a second limiting plate disposed on the impact rod, an impact spring sleeved on the impact rod between the second limiting plate and the positioning plate, the impact rod being connected to the impact plate, an extension plate disposed at the end of the impact rod away from the impact plate, a rotating shaft rotatably disposed within the power chamber, a push plate disposed on the rotating shaft for use with the extension plate, a push gear disposed on the rotating shaft, the push gear being connected to the rotating shaft via a one-way bearing, a push tooth groove disposed on the extension rod for meshing with the push gear, an electric telescopic rod disposed on the film-coating frame and connected to a mounting plate, and a sensor electrically connected to the electric telescopic rod disposed within the film-coating frame.

[0011] In some embodiments, the cutting unit includes a separating member disposed on a mounting plate, which cuts and separates the protruding spikes on the surface of the straw bale. The separating member is provided with a discharge member, which discharges the cut spikes out of the film-coating frame.

[0012] In some embodiments, the separating component includes a collection chamber disposed on a mounting plate, wherein a first support plate and a second support plate are disposed within the collection chamber, and both the first support plate and the second support plate are provided with positioning shafts, which are located on the first support plate and the second support plate in opposite directions. A deflection groove is provided on the positioning shaft, and a deflection shaft is rotatably disposed within the deflection groove. A torsion spring is disposed within the deflection groove and is connected to the deflection shaft. A cutting strip is provided on the deflection shaft, and the cutting strip is provided with serrations. A separating comb is disposed on the collection chamber.

[0013] In some embodiments, the mounting plate is provided with a discharge pipe, which is connected to the collection chamber. A discharge shaft is rotatably arranged inside the discharge pipe, and an auger is provided on the discharge shaft. The discharge shaft is driven to rotate by an external power source.

[0014] In some embodiments, a metal pad is provided on the side of the impact plate that contacts the straw bundle.

[0015] This invention has at least the following beneficial effects:

[0016] By adding axially arranged spring-loaded pressure plates and impact plates to the front of the covering frame, segmented adaptive pretreatment of the bale surface is achieved. When the spring-loaded pressure plate contacts an indestructible stone and is pushed to a preset displacement, the linked pressing unit drives the impact plate at the corresponding position to press the foreign object into the bale with an instantaneous radial impact, eliminating the source of the thorn. At the same time, the cutting unit, through a bidirectional elastic blade-avoiding structure, enables the cutting strip to adaptively avoid indestructible hard objects in accordance with the direction of the sharp point deflection. After cutting, it automatically resets, effectively removing the hard stubble on the surface and actively expelling it by the auger. The entire pretreatment process is completed before the bale is covered with film, without changing the original spiral winding process. The sharp protrusions on the surface of the treated bale are significantly removed or pressed in, and the film material can be directly wrapped on a relatively flat and safe surface, significantly reducing the film damage rate and reducing the number of additional wrapping layers required for puncture prevention. This systematically improves the reliability and economic efficiency of the film sealing process of the whole stalk pressing. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0018] Figure 2 This is a schematic diagram of the coating frame structure of the present invention;

[0019] Figure 3 This is a schematic cross-sectional view of the coating frame structure of the present invention;

[0020] Figure 4 This is a schematic diagram of the impact component structure of the present invention;

[0021] Figure 5 This is a schematic diagram of the cross-sectional structure of the detection component of the present invention;

[0022] Figure 6 This is a schematic diagram of the cross-sectional structure of the power compartment of the present invention;

[0023] Figure 7 This is a schematic diagram of the power component structure of the present invention;

[0024] Figure 8 This is a schematic diagram of the exploded structure of the power component of the present invention;

[0025] Figure 9 This is a schematic diagram of the two cross-sectional structures of the pneumatic chamber of the present invention;

[0026] Figure 10 This is a schematic diagram of the discharge shaft structure of the present invention;

[0027] Figure 11 This is a schematic diagram of the cutting unit structure of the present invention;

[0028] Figure 12 This is a schematic diagram of the separator structure of the present invention;

[0029] Figure 13 This is a schematic diagram of the structure of Embodiment 2 of the present invention.

[0030] In the diagram: 1. Base; 2. Film covering frame; 3. Film conveying frame; 4. Power chamber; 5. Impact plate; 6. Detection chamber; 7. Spring pressure plate; 8. Pressing unit; 9. Detection component; 91. U-shaped mounting plate; 92. Sliding shaft; 93. Limiting plate one; 94. Fixing plate; 95. Trigger spring; 10. Trigger component; 101. Pneumatic chamber one; 102. Piston plate one; 103. Pneumatic chamber two; 104. Guide tube; 105. Extension rod; 106. Piston plate two; 107. Return spring; 11. Power component; 111. Energy storage chamber; 112. Pressure spring; 113. Piston plate three; 114. Discharge port; 115. Discharge shaft; 116. Sealing block; 117. Iron sheet; 118. Magnetic sheet; 119. Lifting... 12. Lifting plate; 12. Impact component; 121. Impact rod; 122. Limiting plate II; 123. Impact spring; 124. Positioning plate; 125. Extension plate; 126. Rotating shaft; 127. Pushing plate; 128. Pushing gear; 129. Pushing tooth groove; 1210. Electric telescopic rod; 1211. Sensor; 13. Cutting unit; 14. Separator; 141. Collection bin; 142. Bearing plate I; 143. Bearing plate II; 144. Positioning shaft; 145. Deflection groove; 146. Deflection shaft; 147. Torsion spring; 148. Cutting strip; 149. Sawtooth; 1410. Separating comb; 15. Discharge component; 151. Discharge pipe; 152. Discharge shaft; 153. Screwdriver; 16. Metal gasket. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] Example 1: Please refer to Figures 1-12This invention provides a technical solution: an automatic film covering device for the surface of bundled straw, comprising a base 1, a film covering frame 2, and a film conveying frame 3. A U-shaped mounting plate 91 is slidably mounted on the film covering frame 2, and a power chamber 4 is provided on the U-shaped mounting plate 91. Multiple impact plates 5 are provided on the power chamber 4, and the impact plates 5 are arranged in strips along the axial direction of the straw bundle. A detection chamber 6 is installed on the film covering frame 2, and multiple spring-loaded plates 7 are provided on the detection chamber 6, and the spring-loaded plates 7 are arranged in strips along the axial direction of the straw bundle. 7 corresponds one-to-one with the impact plate 5 in the axial direction; the U-shaped mounting plate 91 is provided with a pressing unit 8 connected to the impact plate 5; when the spring plate 7 detects a protruding stone on the surface of the straw bale and is pushed by the stone to produce a preset displacement, it drives the impact plate 5 at the corresponding position to pop out towards the surface of the straw bale, applying a radially inward instantaneous impact force to the stone and pressing it into the inside of the straw bale; the U-shaped mounting plate 91 is also provided with a cutting unit 13, which is used to cut and separate the protruding spikes on the surface of the straw bale.

[0033] The pressing unit 8 includes a detection element 9 installed on the detection chamber 6, which detects whether there are protruding stones on the surface of the straw bale. The detection chamber 6 is equipped with a trigger element 10, which triggers the impact plate 5 to work. The power chamber 4 is equipped with a power element 11, which provides power to the impact plate 5. The power chamber 4 is equipped with an impact element 12, which drives the impact plate 5 to work.

[0034] After the cylindrical straw bale, pressed and formed, begins to rotate around its horizontal axis on the covering frame 2 driven by rollers, the electric telescopic rod 1210, under the control of sensor 1211, pushes the U-shaped mounting plate 91 to slide along the covering frame 2. This brings the mounting plate, along with its integrated power chamber 4, detection chamber 6, and cutting strip 148, close to the surface of the rotating straw bale, entering the pre-processing station. At this time, multiple spring-loaded plates 7 and multiple impact plates 5, arranged in strips along the axial direction of the straw bale, correspond one-to-one in their axial positions. The straw bale will first rotate at a specified angle before starting the covering and winding process. When sensor 1211 detects that the straw roller has completed one rotation, the electric telescopic rod 1210, under the control of sensor 1211, pushes the U-shaped mounting plate 91 down along the covering frame 2 away from the straw bale that has completed one wrap, avoiding damage to the subsequent protective film.

[0035] The testing component 9 includes a U-shaped mounting plate 91 slidably mounted on the film-coating frame 2. The mounting plate is connected to the power chamber 4 and the testing chamber 6. A sliding shaft 92 is slidably mounted on the testing chamber 6. A fixing plate 94 is provided inside the testing chamber 6. One end of the sliding shaft 92 passes through the fixing plate 94 and is slidably connected to the fixing plate 94. A limit plate 93 is provided on the sliding shaft 92. A trigger spring 95 is sleeved on the sliding shaft 92 between the fixing plate 94 and the limit plate. The section of the sliding shaft 92 located outside the testing chamber 6 is connected to the spring pressure plate 7.

[0036] The trigger 10 includes a pneumatic chamber 101 disposed within the detection chamber 6. A piston plate 102 is slidably disposed within the pneumatic chamber 101. The piston plate 102 is connected to a sliding shaft 92, and the sliding shaft 92 is slidably connected to the pneumatic chamber 101. A pneumatic chamber 2 103 is disposed within the power chamber 4. A conduit 104 is disposed within the pneumatic chamber 101. The conduit 104 is connected to the pneumatic chamber 2 103 via a one-way exhaust valve, and the pneumatic chamber 101 is connected to the outside via a one-way intake valve. A piston plate 2 106 is slidably disposed within the pneumatic chamber 2 103. An extension rod 105 is disposed on the piston plate 2 106. One end of the extension rod 105 passes through the pneumatic chamber 2 103 and is slidably connected to the pneumatic chamber 2 103. A return spring 107 is sleeved on one end of the extension rod 105 located within the pneumatic chamber 2 103.

[0037] The detection chamber 6 is equipped with multiple spring-loaded plates 7, each connected to a sliding shaft 92. A trigger spring 95 is fitted onto the sliding shaft 92, and its working position is limited by a limiting plate 93 and a fixing plate 94. When there are protruding stones on the surface of the hay bale, as the bale rotates, the stones push against the corresponding spring-loaded plate 7, causing the sliding shaft 92 to displace against the elastic force of the trigger spring 95. The preload force of the trigger spring 95 constitutes the detection threshold: flexible stubble and spikes, due to their low yield strength, cannot cause the sliding shaft 92 to displace by a preset amount; while hard stones, because they are almost undeformable, force the spring-loaded plate 7 and the sliding shaft 92 to produce sufficient displacement, thus being identified as foreign objects requiring processing.

[0038] By cooperating with the trigger spring 95 sleeved on the sliding shaft 92, the limiting plate 93, and the fixing plate 94, a displacement detection mechanism with a preset threshold is constructed. The preload of the trigger spring 95 constitutes the identification threshold. When the spring plate 7 comes into contact with a bendable hard object or spike, because the yield force of such protrusions is lower than the spring preload, they will bend and give way during contact, and will not be able to push the sliding shaft 92 to produce sufficient displacement, thus being automatically filtered out and not triggering subsequent actions. Only when the spring plate 7 encounters an indestructible protruding stone, the high rigidity of the stone forces the spring plate 7 and the sliding shaft 92 to overcome the elastic force of the trigger spring 95 and produce a preset displacement, it is determined to be a foreign object that needs to be processed. Thus, the detection of hard objects is achieved without relying on any electronic sensor 1211 or controller. The automatic differentiation between two types of surface protrusions, stubble and stones, which are similar in appearance but have completely different mechanical properties, is achieved by the displacement of the sliding shaft 92 directly driving the piston plate 102 in the pneumatic chamber 101 after the detection signal is triggered. The mechanical displacement is converted into a pneumatic pressure signal, which is transmitted to the pneumatic chamber 2 103 in the power chamber 4 through the conduit 104 and the one-way exhaust valve. This drives the piston plate 2 106 and the extension rod 105 to move. The one-way air inlet valve ensures that the pneumatic chamber 101 is automatically replenished and reset during the return stroke. This allows the detection end and the execution end to achieve spatial separation and flexible transmission through the pneumatic circuit, avoiding the layout limitations and impact interference caused by rigid linkage. At the same time, it ensures that the spring pressure plates 7 of each section are detected independently and do not interfere with each other, enabling the device to synchronously monitor and respond to multiple foreign objects along the axial direction of the hay bale.

[0039] The power component 11 includes a power storage chamber 111 disposed within the power chamber 4. A piston plate 113 is slidably disposed within the power storage chamber 111. A pressure spring 112 is disposed within the power storage chamber 111. Both ends of the piston plate 113 are connected to the pressure spring 112 and the inner wall of the power storage chamber 111, respectively. A discharge port 114 is disposed at the bottom of the pneumatic chamber 103. A discharge shaft 115 is slidably disposed on the piston plate 106. A blocking block 116 is disposed at one end of the discharge shaft 115, which engages with the discharge port 114. An iron plate 117 is disposed at the other end of the discharge shaft 115. A magnetic plate 118 is disposed at the top of the pneumatic chamber 103, which cooperates with the iron plate 117. A lifting plate 119 is disposed on the discharge shaft 115 between the iron plate 117 and the piston plate 106.

[0040] The impact member 12 includes an impact rod 121 slidably disposed on the power chamber 4. A positioning plate 124 is disposed inside the power chamber 4. One end of the impact rod 121 passes through the positioning plate 124 and is slidably connected to it. A second limiting plate 122 is disposed on the impact rod 121. An impact spring 123 is sleeved on the impact rod 121 between the second limiting plate 122 and the positioning plate 124. The impact rod 121 is connected to the impact plate 5. An extension plate 125 is disposed at the end of the impact rod 121 away from the impact plate 5. The power chamber 4... The inner rotating part is provided with a rotating shaft 126, on which a push plate 127 is provided for use with the extension plate 125. A push gear 128 is provided on the rotating shaft 126, and the push gear 128 is connected to the rotating shaft 126 through a one-way bearing. The extension rod 105 is provided with a push tooth groove 129 that meshes with the push gear 128. The film covering frame 2 is provided with an electric telescopic rod 1210 connected to the mounting plate. A sensor 1211 electrically connected to the electric telescopic rod 1210 is provided inside the film covering frame 2.

[0041] When a certain spring plate 7 detects a stone and generates a preset displacement, the movement of the spring plate 7 causes the sliding shaft 92 to shift, further driving the piston plate 102 in the pneumatic chamber 101 to move. This compresses the air in the pneumatic chamber 101 and forces it through a one-way exhaust valve and conduit 104 into the pneumatic chamber 2 103 in the power chamber 4, pushing the piston plate 2 106 and its extension rod 105 to move. The pushing tooth groove 129 on the extension rod 105 meshes with the pushing gear 128 on the rotating shaft 126, but... Since the drive gear 128 is connected to the rotating shaft 126 via a one-way bearing, it does not drive the rotating shaft 126 to rotate during ascent. Simultaneously, the pressure spring 112 and piston plate 113 in the accumulator 111 are synchronously subjected to the gas pressure in the pneumatic chamber 103. When piston plate 106 reaches the end of its stroke, it contacts the lifting plate 119 and pushes the lifting plate 119 and the discharge shaft 115 upwards. When the discharge shaft 115 rises to a predetermined height, it causes the sealing block 116 to... When the discharge port 114 disengages, the iron plate 117 is simultaneously attracted by the magnetic plate 118, ensuring continuous gas discharge. At this time, the pressure spring 112 in the accumulator 111 releases, pushing the piston plate 113 downward. The downward movement of the piston plate 113 causes the extension rod 105 to descend, causing the push gear 129 on the extension rod 105 to rotate, which in turn drives the push gear 128 to rotate, further driving the rotating shaft 126 to rotate. When the rotating shaft 126 rotates, it drives the push plate 127 to rotate synchronously. When the push plate 127 rotates, it pushes the extension rod 105 downward. The plate 125 and the impact rod 121 connected to the extension plate 125 are displaced. During the displacement of the impact rod 121, the impact spring 123 is compressed. During the continuous rotation of the push plate 127, the push plate 127 will disengage from the extension plate 125. At this time, the impact rod 121 and the limiting plate 122, under the action of the impact spring 123, drive the impact plate 5 at the corresponding position to pop out onto the surface of the straw bale, and apply a radial inward instantaneous impact force to the stone detected by the spring plate 7, pressing it completely into the straw bale.

[0042] The energy required for impact is pre-stored independently in the energy storage chamber 111 through the pre-set energy storage structure of the pressure spring 112 and piston plate 113 within the energy storage chamber 111, rather than relying on the displacement of the detection end to directly provide the impact force. This ensures that the magnitude of the impact energy is determined only by the preload parameter of the pressure spring 112, and is independent of the size of the stone and the displacement amplitude of the spring plate 7, thus guaranteeing that the impact force of each pressing action is stable and controllable. The sliding nested structure of piston plate 106 and discharge shaft 115 within the pneumatic chamber 103 further contributes to this effect. With the adsorption and retention mechanism of iron sheet 117 and magnetic sheet 118, piston plate 106 is pneumatically driven to move upward first to complete the pressure preparation. When it reaches the end of its stroke, lifting plate 119 pushes discharge shaft 115 to disengage sealing block 116 from discharge port 114, and the accumulator 111 is instantly released. This completely separates the slow pneumatic pressurization process from the instantaneous impact release action in terms of timing, avoiding interference from displacement velocity fluctuations at the detection end on the impact response speed; the push tooth groove 12 on extension rod 105 The extension rod 105 is connected to the push gear 128 on the rotating shaft 126 via a one-way bearing. This ensures that the extension rod 105 does not drive the rotating shaft 126 to rotate when it rises under the drive of the piston plate 106, but only engages to drive the rotating shaft 126 to rotate when it descends. This achieves a one-way transmission logic of "no movement when rising and work done when descending," ensuring that the energy release of the impact rod 121 occurs strictly after detection and confirmation and is only a single impact, preventing damage to the bale structure from accidental triggering or repeated impacts. The separable push engagement between the push plate 127 on the rotating shaft 126 and the extension plate 125 allows the impact rod 121 to pop out under the push of the impact spring 123 when the push plate 127 rotates to disengage from the extension plate 125. The impact force is applied to the impact plate 5 in a pulse manner. After the impact is completed, the impact rod 121 resets itself under the action of the impact spring 123, forming a complete mechanical cycle of "detection-energy storage-impact-reset." This allows each independent pressing unit 8 to process multiple foreign objects in a targeted and orderly manner without interference.

[0043] The cutting unit 13 includes a separating member 14 mounted on the mounting plate. The separating member 14 cuts and separates the protruding spikes on the surface of the straw bale. The separating member 14 is provided with a discharge member 15, through which the cut spikes are discharged from the film-coating frame 2.

[0044] The separating component 14 includes a collection chamber 141 mounted on a mounting plate. A first support plate 142 and a second support plate 143 are disposed within the collection chamber 141. Positioning shafts 144 are provided on both the first support plate 142 and the second support plate 143, and the positioning shafts 144 on the first support plate 142 and the second support plate 143 are oriented in opposite directions. A deflection groove 145 is provided on the positioning shaft 144. A deflection shaft 146 is rotatably disposed within the deflection groove 145. A torsion spring 147 is disposed within the deflection groove 145 and is connected to the deflection shaft 146. A cutting strip 148 is provided on the deflection shaft 146, and the cutting strip 148 has serrations 149. A separating comb 1410 is provided on the collection chamber 141.

[0045] The mounting plate is provided with a discharge pipe 151, which is connected to the collection chamber 141. A discharge shaft 152 is rotatably installed inside the discharge pipe 151, and an auger 153 is installed on the discharge shaft 152. The discharge shaft 152 is driven to rotate by an external power source.

[0046] The collection chamber 141 is equipped with a first support plate 142 and a second support plate 143, on which positioning shafts 144 in opposite directions are respectively set. Each positioning shaft 144 is equipped with a cutting strip 148 with serrations 149 through a deflection groove 145, a deflection shaft 146 and a torsion spring 147. When the spikes on the surface of the bale come into contact with the cutting strip 148, the cutting strip 148 can adaptively rotate around the deflection shaft 146 according to the deflection direction of the spikes. Under the rebound force provided by the torsion spring 147, the cutting strip effectively cuts the spikes and achieves elastic blade deflection to avoid rigid collision with hard objects that cannot be cut. The debris generated by cutting is collected by the separation comb 1410 on the collection chamber 141. The discharge shaft 152 driven by the external power source drives the auger 153 to rotate and actively discharge the debris from the film-coating frame 2 through the discharge pipe 151 to prevent accumulation from interfering with subsequent operations.

[0047] The collection chamber 141 contains two sets of positioning shafts 144 facing opposite directions. Each positioning shaft 144 is fitted with a cutting strip 148 with serrated teeth 149 via a deflection groove 145, a deflection shaft 146, and a torsion spring 147. This allows the cutting strip 148 to adaptively rotate around the deflection shaft 146 according to its deflection direction when it contacts a spike, yielding to the position of the spike and simultaneously completing the sawing under the rebound force of the torsion spring 147. This achieves bidirectional adaptive cutting of hard spikes at different positions. Furthermore, the elastic yielding mechanism allows the cutting strip 148 to passively retract when encountering uncuttable hard objects, avoiding rigid collisions. The chipping or jamming of the blades ensures the continuity and reliability of the cutting action. The debris generated during cutting is combed off from the cutting strip 148 by the separation comb 1410 at the top of the collection chamber 141 and collected in the chamber. The discharge shaft 152 driven by an external power source drives the auger 153 to rotate, and the debris is actively discharged from the film-coating frame 2 through the discharge pipe 151. This allows the cutting and separation and debris removal processes to be carried out simultaneously and continuously, preventing debris from accumulating in the collection chamber 141 and blocking the cutting path or falling onto the surface of the bale and interfering with subsequent film coating. This provides a clean bale surface condition with the surface stubble removed for subsequent spiral winding and film coating.

[0048] Example 2: Please refer to Figure 13 The present invention provides a technical solution: a metal pad 16 is provided on the side of the impact plate 5 that contacts the straw bundle. The metal pad 16 on the side of the impact plate 5 that contacts the straw bundle can significantly enhance the wear resistance and impact resistance of the working surface of the impact plate 5, and effectively avoid excessive wear or local deformation of the impact plate 5 substrate caused by frequent impacts with stones and straw fibers. At the same time, the surface of the metal pad 16 is smooth and has high hardness, which can reduce the frictional resistance between the metal pad and the straw and stones, so that the instantaneous impact force is transmitted to the stone to be pressed in more concentratedly and efficiently, thereby improving the pressing effect.

[0049] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0050] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention.

Claims

1. An automatic film covering device for the surface of bundled straw, comprising a base (1), a film covering frame (2), and a film conveying frame (3), characterized in that: A U-shaped mounting plate (91) is slidably installed on the film-covering frame (2), and a power chamber (4) is provided on the U-shaped mounting plate (91); multiple impact plates (5) are provided on the power chamber (4), and the impact plates (5) are arranged in strips along the axial direction of the straw bundle; a detection chamber (6) is installed on the film-covering frame (2), and multiple spring pressure plates (7) are provided on the detection chamber (6), and the spring pressure plates (7) are arranged in strips along the axial direction of the straw bundle, and the spring pressure plates (7) and the impact plates (5) are positioned one-to-one in the axial direction. Correspondingly; the U-shaped mounting plate (91) is provided with a pressing unit (8) connected to the impact plate (5); when the spring plate (7) detects that there is a protruding stone on the surface of the straw bundle and is pushed by the stone to produce a displacement of a preset amplitude, it drives the impact plate (5) at the corresponding position to pop out onto the surface of the straw bundle, applying a radially inward instantaneous impact force to the stone and pressing it into the inside of the straw bundle; the U-shaped mounting plate (91) is also provided with a cutting unit (13) to cut and separate the protruding spikes on the surface of the straw bundle; The pressing unit (8) includes a detection element (9) installed on the detection chamber (6), which detects whether there are protruding stones on the surface of the straw bale. A trigger element (10) is installed in the detection chamber (6), which triggers the impact plate (5) to work. A power element (11) is installed in the power chamber (4), which provides power to the impact plate (5) to work. An impact element (12) is installed on the power chamber (4), which drives the impact plate (5) to work. The detection component (9) includes a U-shaped mounting plate (91) slidably mounted on the film-covering frame (2). The mounting plate is connected to the power chamber (4) and the detection chamber (6). A sliding shaft (92) is slidably mounted on the detection chamber (6). A fixed plate (94) is provided inside the detection chamber (6). One end of the sliding shaft (92) passes through the fixed plate (94) and is slidably connected to the fixed plate (94). A limit plate (93) is provided on the sliding shaft (92). A trigger spring (95) is sleeved on the sliding shaft (92) between the fixed plate (94) and the limit plate. The section of the sliding shaft (92) outside the detection chamber (6) is connected to the spring pressure plate (7). The trigger (10) includes a pneumatic chamber one (101) disposed in the detection chamber (6), a piston plate one (102) slidably disposed in the pneumatic chamber one (101), the piston plate one (102) being connected to a sliding shaft (92), and the sliding shaft (92) being slidably connected to the pneumatic chamber one (101). A pneumatic chamber two (103) is disposed in the power chamber (4), and a conduit (104) is disposed in the pneumatic chamber one (101), the conduit (104) being vented by one-way exhaust. The valve is connected to the second pneumatic chamber (103), and the first pneumatic chamber (101) is connected to the outside through a one-way air intake valve. A piston plate (106) is slidably arranged inside the second pneumatic chamber (103). An extension rod (105) is arranged on the second piston plate (106). One end of the extension rod (105) passes through the second pneumatic chamber (103) and is slidably connected to the second pneumatic chamber (103). A return spring (107) is sleeved on one end of the extension rod (105) inside the second pneumatic chamber (103).

2. The automatic film covering device for the surface of straw after bundling according to claim 1, characterized in that: The power component (11) includes a power storage chamber (111) disposed within a power chamber (4). A piston plate (113) is slidably disposed within the power storage chamber (111). A pressure spring (112) is disposed within the power storage chamber (111). Both ends of the piston plate (113) are connected to the pressure spring (112) and the inner wall of the power storage chamber (111), respectively. A discharge port (114) is disposed at the bottom of the pneumatic chamber (103). A piston plate (106) is slidably disposed on the piston plate (106). There is a discharge shaft (115), one end of which is provided with a blocking block (116), which engages with the discharge port (114), and the other end of the discharge shaft (115) is provided with an iron plate (117). The top of the pneumatic chamber two (103) is provided with a magnetic plate (118) that works with the iron plate (117). A lifting plate (119) is provided on the discharge shaft (115) between the iron plate (117) and the piston plate two (106).

3. The automatic film covering device for the surface of straw after bundling according to claim 2, characterized in that: The impact member (12) includes an impact rod (121) slidably disposed on the power chamber (4). A positioning plate (124) is disposed inside the power chamber (4). One end of the impact rod (121) passes through the positioning plate (124) and is slidably connected to the positioning plate (124). A second limiting plate (122) is disposed on the impact rod (121). An impact spring (123) is sleeved on the impact rod (121) between the second limiting plate (122) and the positioning plate (124). The impact rod (121) is connected to the impact plate (5). An extension plate (125) is disposed at the end of the impact rod (121) away from the impact plate (5). A rotating shaft (126) is rotatably installed inside the force chamber (4). A push plate (127) that works with the extension plate (125) is installed on the rotating shaft (126). A push gear (128) is installed on the rotating shaft (126). The push gear (128) is connected to the rotating shaft (126) through a one-way bearing. A push tooth groove (129) that meshes with the push gear (128) is installed on the extension rod (105). An electric telescopic rod (1210) that is connected to the mounting plate is installed on the film covering frame (2). A sensor (1211) that is electrically connected to the electric telescopic rod (1210) is installed inside the film covering frame (2).

4. The automatic film covering device for the surface of bundled straw according to claim 3, characterized in that: The cutting unit (13) includes a separating member (14) on the mounting plate. The separating member (14) cuts and separates the protruding spikes on the surface of the straw bundle. The separating member (14) is provided with a discharge member (15), through which the cut spikes are discharged from the film-covering frame (2).

5. The automatic film covering device for the surface of bundled straw according to claim 4, characterized in that: The separating component (14) includes a collection chamber (141) mounted on a mounting plate. The collection chamber (141) contains a first bearing plate (142) and a second bearing plate (143). Both the first bearing plate (142) and the second bearing plate (143) are provided with positioning shafts (144), and the positioning shafts (144) on the first bearing plate (142) and the second bearing plate (143) are in opposite directions. The positioning shafts (144) are provided with deflection grooves (145). A deflection shaft (146) is rotatably mounted in the deflection grooves (145). A torsion spring (147) is provided in the deflection grooves (145). The torsion spring (147) is connected to the deflection shaft (146). A cutting strip (148) is provided on the deflection shaft (146), and the cutting strip (148) is provided with serrations (149). The collection chamber (141) is provided with a separating comb (1410).

6. The automatic film covering device for the surface of straw after bundling according to claim 5, characterized in that: The mounting plate is provided with a discharge pipe (151), which is connected to the collection chamber (141). A discharge shaft (152) is rotatably arranged inside the discharge pipe (151), and an auger (153) is provided on the discharge shaft (152). The discharge shaft (152) is driven to rotate by an external power source.

7. The automatic film covering device for the surface of straw after bundling according to claim 6, characterized in that: A metal gasket (16) is provided on the side of the impact plate (5) that contacts the straw bundle.

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