Biomass straw briquetting machine

Abstract

The present application relates to the technical field of straw briquetting, in particular to a biomass straw briquetting forming machine, which comprises a shell, an extrusion mechanism arranged on the shell, and a mold fixedly installed on the upper side of the shell, the forming machine further comprises an extrusion mechanism for actively extruding the material in the mold, and a shaping structure for pressure maintaining the straw block after forming, the present application adopts the side pressing plate and the lower pressing plate to alternately perform the vibration type active extrusion when the straw material passes through the extrusion hole of the mold, effectively improving the compactness of the material during the forming process, at the same time, the square hole on the reciprocating rotating pressure maintaining disc is used to cut and temporarily store the straw block after pressing and forming, ensuring the shape stability of the straw block after briquetting and forming, the present application adopts the ramming block sliding along the radial direction of the mold to apply the vibration action to the length direction of the straw block during the pressure maintaining stage, further enhancing the pressing effect and the forming density.

Description

Technical Field

[0001] This invention relates to the field of straw briquetting technology, specifically a biomass straw briquetting machine. Background Technology

[0002] With the continuous development of agricultural production, straw, as a common agricultural waste, has become an important issue in terms of its treatment and resource utilization. Compacting straw can significantly reduce its volume and increase its density, thereby facilitating transportation and reducing storage space requirements, and also improving the energy density as biomass fuel.

[0003] Currently, most common straw briquetting equipment uses extrusion molding machines. During operation, the pre-treated straw material is transported into the briquetting machine housing, so that the straw material is located inside the mold. Then, through the extrusion mechanism, such as rotating pressure plate or hydraulic push rod, the material is forced into the extrusion hole of the mold. As the material passes through the extrusion hole, it is subjected to the squeezing and friction of the hole wall, forming straw blocks with a certain shape and density.

[0004] However, since the size of the extrusion orifice of the mold is fixed, the material is only compressed for a short time after being pushed through the extrusion orifice, resulting in uneven compaction inside the briquette and low overall density. In addition, as an elastic body, straw will rebound and expand due to elastic recovery if it is immediately released from the constraint after extrusion molding, causing the briquette density to decrease, the surface to crack, or even the whole briquette to become loose.

[0005] In summary, there is an urgent need for equipment that can actively enhance the compression effect during straw material extrusion and maintain the pressure and shape of the straw blocks after briquetting. Summary of the Invention

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a biomass straw briquetting machine, including a shell, an extrusion mechanism provided on the shell, a mold fixedly installed on the upper side of the shell, the briquetting machine also includes an extrusion mechanism for actively extruding the material inside the mold, and a shaping structure for maintaining pressure on the briquetting straw blocks.

[0007] The extrusion mechanism includes several side pressure plates that are equidistantly arranged along the circumference of the mold and slidably arranged along its inner side. The side pressure plates are located on the left side of the mold extrusion hole. Several lower pressure plates that are equidistantly arranged along the circumference of the mold and slidably connected to it are located on the inner side of the mold and are located on the upper part of the mold extrusion hole.

[0008] The shaping structure includes a pressure holding plate rotatably disposed on the outside of the mold. The pressure holding plate has square holes arranged radially at equal intervals along its circumference. The number of extrusion holes in the mold is half that of the square holes. A blocking ring is fixedly connected to the housing and rotatably sleeved on the outside of the pressure holding plate. The blocking ring has through grooves that correspond one-to-one with the extrusion holes in the mold.

[0009] During briquetting, the extrusion mechanism pushes the material inside the shell into the extrusion hole of the mold. Then, the side pressure plate and the lower pressure plate move alternately to actively squeeze the material. When the material is pushed into the square hole of the pressure holding plate, the pressure holding plate is rotated, causing the blocking ring and the mold to close both ends of the square hole for pressure holding and shaping.

[0010] Preferably, the lower pressure plate has semi-circular protrusions arranged in an array fixedly on its lower side near the mold axis, and the lower pressure plate diffuses and compresses the material through the semi-circular protrusions.

[0011] Preferably, a linkage column extending upward to the upper part of the mold is fixedly installed on the upper side of the side pressure plate, and a connecting column extending upward to the upper part of the mold is fixedly installed on the upper side of the lower pressure plate. The upper parts of the linkage column and the connecting column are both inclined.

[0012] Preferably, a drive ring is rotatably provided on the upper side of the mold, and a synchronous motor is fixedly installed on the rear side of the housing. The output shaft of the synchronous motor is connected to the drive ring via a belt and drives the drive ring to rotate.

[0013] Preferably, a plurality of spring damping rods corresponding to the number of die extrusion holes are fixedly installed at equal intervals along the circumference of the lower side of the drive ring, and inclined blocks for alternately pushing the lower pressure plate and the side pressure plate are fixedly installed on the lower side of the spring damping rods. A plurality of wedge plates are fixedly installed at equal intervals along the circumference of the outer side of the drive ring.

[0014] Preferably, the outer side of the mold is provided with tamping blocks that slide radially along its circumference at equal intervals, and the tamping blocks are located between two extrusion holes on the mold.

[0015] Preferably, the tamping block has an inclined surface, and a plurality of drive plates corresponding one-to-one with the tamping block are vertically slidably arranged on the upper side of the mold. A reset spring is provided between the drive plate and the mold. The lower side of the drive plate is inclined and slidably connected to the tamping block for pushing the tamping block outward.

[0016] Preferably, the pressure holding plate has swing blocks hinged to both the upper and lower sides of the square hole. Two pressing rods are connected to the side of the swing block away from the middle of the square hole of the pressure holding plate through a slot. The pressing rods are vertically slidably connected to the pressure holding plate.

[0017] Preferably, two inner track rings symmetrically arranged above and below the pressure plate and two outer track rings symmetrically arranged above and below the pressure plate are fixedly installed on the housing. The inner track rings and outer track rings are used to press the inner and outer pressing rods on the swing block, respectively.

[0018] Preferably, the housing and the pressure holding plate are hinged together by a hydraulic cylinder for driving the pressure holding plate to reciprocate. The hydraulic cylinder drives the pressure holding plate to reciprocate, so that two adjacent square holes on the pressure holding plate alternately correspond to the extrusion holes of the same mold.

[0019] The beneficial effects of this invention are as follows: First, this invention uses a side pressure plate and a bottom pressure plate to alternately vibrate and actively compress the straw material as it passes through the die extrusion hole, which effectively improves the density of the material during the molding process. At the same time, the square holes on the reciprocating pressure plate can cut and temporarily store the compressed straw blocks, effectively suppressing the rebound expansion of the straw elastomer and ensuring the stability of the shape of the compressed straw blocks after molding.

[0020] Second, the present invention uses a semi-circular protrusion set on the lower side of the pressure plate to press the straw block in a dot matrix manner. During the dot pressing process, the inside of the straw block is locally squeezed, which causes the material to move from the dense area to the loose area, thereby improving the density and uniformity of the block and improving the overall molding quality.

[0021] Third, the present invention uses a tamping block that slides radially along the mold to apply a vibration effect to the length of the straw block during the pressure holding stage, which expands the direction of active pressing and further enhances the pressing effect and molding density.

[0022] Fourth, this invention uses an outer trajectory ring and an inner trajectory ring to push the pressure rod at the corresponding position, driving the swing block to tilt when it is in the corresponding die extrusion hole, thereby increasing the outlet of the pressure plate square hole and decreasing the inlet of the pressure plate square hole. This facilitates the smooth release of the straw block after the pressure is maintained, and also hinders the straw block moving from the die extrusion hole into the pressure plate square hole, reducing the expansion of the straw block along its length when the side of the straw block is pressed, thereby improving the pressing effect. Attached Figure Description

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0024] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0025] Figure 2 This is a partial cross-sectional view of the housing, drive ring, mold, and synchronous motor in this invention.

[0026] Figure 3 This is a cross-sectional view of the shell and mold in this invention.

[0027] Figure 4 This is a schematic diagram of the structure of the shell, mold, pressure plate and hydraulic cylinder in this invention.

[0028] Figure 5 This is a partial cross-sectional view of the mold, pressure plate, side pressure plate and swing block in this invention.

[0029] Figure 6 This is a partial cross-sectional view of the side pressure plate, lower pressure plate, mold, and semi-circular protrusion in this invention.

[0030] Figure 7 This is a partial cross-sectional view of the drive ring, inclined block, wedge plate and side pressure plate in this invention.

[0031] Figure 8 This is a partial cross-sectional view of the mold, tamping block, wedge plate and drive plate in this invention.

[0032] Figure 9 This is a partial cross-sectional view of the shell, inner track ring, outer track ring and swing block in this invention.

[0033] Figure 10 This is a partial cross-sectional view of the pressure plate, pressure rod, swing block and tamping block in this invention.

[0034] In the diagram: 1. Shell; 2. Extrusion mechanism; 3. Mold; 4. Extrusion mechanism; 5. Shaping structure; 31. Drive ring; 32. Synchronous motor; 41. Side pressure plate; 42. Lower pressure plate; 51. Pressure holding plate; 52. Blocking ring; 53. Tamping block; 54. Hydraulic cylinder; 311. Spring damping rod; 312. Inclined block; 313. Wedge plate; 411. Linkage column; 421. Semi-circular protrusion; 422. Connecting column; 511. Swing block; 512. Pressing rod; 513. Inner trajectory ring; 514. Outer trajectory ring; 531. Drive plate. Detailed Implementation

[0035] The embodiments of the present invention are described in detail below. The embodiments described below are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention. Where specific techniques or conditions are not specified in the embodiments, they shall be performed in accordance with the techniques or conditions described in the literature in the art or in accordance with the product manual.

[0036] See Figure 1 , Figure 2 , Figure 3 and Figure 5 A biomass straw briquetting machine includes a housing 1, an extrusion mechanism 2 on the housing 1, a mold 3 fixedly installed on the upper side of the housing 1, an extrusion mechanism 4 for actively extruding the material inside the mold 3, and a shaping structure 5 for maintaining pressure on the formed straw blocks.

[0037] See Figure 5 , Figure 6 and Figure 7 The extrusion mechanism 4 includes several side pressure plates 41 that are equidistantly arranged on the inner side of the mold 3 along its circumference and slide tangentially thereon. The side pressure plates 41 correspond one-to-one with the extrusion holes of the mold 3, and the side pressure plates 41 are located on the left side of the corresponding extrusion holes. Several lower pressure plates 42 are equidistantly arranged on the inner side of the mold 3 along its circumference and slide vertically thereon. The lower pressure plates 42 are located on the upper part of the extrusion holes of the mold 3.

[0038] See Figure 1 , Figure 4 and Figure 5 The shaping structure 5 includes a pressure holding plate 51 rotatably disposed on the outside of the mold 3. The pressure holding plate 51 has square holes arranged radially at equal intervals along its circumference. The number of extrusion holes of the mold 3 is half of the number of square holes. A blocking ring 52 is fixedly connected to the housing 1 and rotatably sleeved on the outside of the pressure holding plate 51. The blocking ring 52 has through grooves that correspond one-to-one with the extrusion holes of the mold 3.

[0039] See Figure 5 , Figure 6 and Figure 7 A linkage column 411 extending upward to the upper part of the mold 3 is fixedly installed on the upper side of the side pressure plate 41, and a connecting column 422 extending upward to the upper part of the mold 3 is fixedly installed on the upper side of the lower pressure plate 42. The upper parts of the linkage column 411 and the connecting column 422 are both inclined.

[0040] See Figure 1 and Figure 2 A drive ring 31 is rotatably mounted on the upper side of the mold 3, and a synchronous motor 32 is fixedly mounted on the rear side of the housing 1. The output shaft of the synchronous motor 32 is connected to the drive ring 31 through a belt and drives the drive ring 31 to rotate.

[0041] See Figure 2 , Figure 5 , Figure 6 and Figure 7 A number of spring damping rods 311 corresponding to the number of extrusion holes of the mold 3 are fixedly installed at equal intervals along the circumference of the lower side of the drive ring 31. An inclined block 312 for alternately pushing the lower pressure plate 42 and the side pressure plate 41 is fixedly installed on the lower side of the spring damping rods 311.

[0042] See Figure 1 and Figure 4 The housing 1 and the pressure plate 51 are hinged together by a hydraulic cylinder 54 for driving the pressure plate 51 to reciprocate. The hydraulic cylinder 54 drives the pressure plate 51 to reciprocate, so that two adjacent square holes on the pressure plate 51 alternately correspond to the extrusion holes of the same mold 3.

[0043] When it is necessary to compress and shape straw materials, the operator first uses a transport device to feed the pre-treated straw materials into the upper part of the shell 1, so that the straw materials fall into the interior of the mold 3 under the action of gravity. Then, the extrusion mechanism 2 is activated to push the straw materials inside the mold 3 into the extrusion hole of the mold 3. The extrusion hole wall squeezes and rubs the straw materials, so that the straw materials are compressed and formed into straw blocks with a certain degree of compactness.

[0044] Simultaneously, the synchronous motor 32 is started to drive the drive ring 31 to rotate, so that the drive ring 31 drives the inclined block 312 to move synchronously through the spring damping rod 311. When the inclined surface of the inclined block 312 contacts the inclined surface structure of the linkage column 411, the rapidly rotating inclined block 312 causes an impact-type push on the linkage column 411, thereby causing the linkage column 411 to drive the side pressure plate 41 to actively press the straw block inside the extrusion hole of the mold 3 by lateral vibration, thereby improving the pressing effect.

[0045] When the side pressure plate 41 moves to its limit position, the inclined block 312 cannot push the linkage column 411, causing the inclined block 312 to move upward along the inclined surface of the linkage column 411 and compress the spring damping rod 311. When the inclined block 312 moves away from the linkage column 411, the elastic force of the spring damping rod 311 pushes the inclined block 312 downward to reset. Subsequently, the inclined block 312 impacts the inclined structure of the connecting column 422. Since the connecting column 422 cannot move horizontally, the connecting column 422 drives the lower pressure plate 42 to press and vibrate the straw block in the extrusion hole of the mold 3, further improving the pressing effect.

[0046] It should be emphasized that during the alternating active pressing process of the side pressure plate 41 and the lower pressure plate 42, although the straw block will diffuse to a certain extent to the other side when one side is pressed, the repeated cycle of diffusion and compression can promote the movement of the material inside the straw block, thereby improving the compactness and uniformity of the material.

[0047] During the alternating pressing of the straw blocks by the side pressure plate 41 and the lower pressure plate 42, the extrusion mechanism 2 continuously pushes new straw material into the extrusion hole of the mold 3, causing the straw blocks in the extrusion hole of the mold 3 to continuously move outward into the corresponding square hole on the pressure holding plate 51. After a certain period of time, the straw blocks fill the square hole of the pressure holding plate 51, and then the extension section of the hydraulic cylinder 54 drives the pressure holding plate 51 to rotate. When the pressure holding plate 51 rotates, it cuts off the straw blocks in the extrusion hole of the mold 3 from the straw blocks in the square hole of the pressure holding plate 51.

[0048] After the pressure plate 51 is rotated into position, the square hole inlet with straw blocks in the pressure plate 51 rotates to be completely offset from the extrusion hole of the mold 3, and at the same time, the square hole outlet with straw blocks is completely offset from the through groove of the blocking ring 52. This causes the blocking ring 52 and the mold 3 to block both ends of the square hole, thereby allowing the straw blocks to be temporarily stored in the square hole of the pressure plate 51 for pressure holding and shaping.

[0049] At the same time, the pressure-holding plate 51 rotates the square hole adjacent to the straw block being pressure-held and shaped to the corresponding extrusion hole of the mold 3, so that the straw block that is continuously moving along the extrusion hole of the mold 3 can continuously enter the square hole. When the straw block enters the square hole, if there is a straw block that has been pressure-held in the square hole, the newly entered straw block will push the straw block that has been pressure-held outward to fall out from the through groove of the blocking ring 52, thereby completing the feeding of the straw block. When the newly entered straw block fills the square hole again, the extension section of the retracting hydraulic cylinder 54 drives the pressure-holding plate 51 to rotate and reset. The principle is the same as above, so that the straw block is pressure-held and shaped while the straw is being continuously pressed.

[0050] To improve the compaction and uniformity of straw blocks during active pressing, this invention designs the following structure: (See attached diagram) Figure 6 The lower pressure plate 42 has semi-circular protrusions 421 arranged in an array on its lower side near the axis of the mold 3. The lower pressure plate 42 diffuses and compresses the material through the semi-circular protrusions 421.

[0051] When the lower pressure plate 42 presses down on the straw block, it can use the semi-circular protrusion 421 on it to press the straw block that has just entered the extrusion hole of the mold 3 in a dot matrix manner, thereby achieving local squeezing of the inside of the straw block and causing the material to move from the dense area to the loose area, thereby improving the density and uniformity of the block and improving the overall molding quality. In addition, the lower side of the lower pressure plate 42 is planar away from the axis of the mold 3. By pressing the straw block with this plane, the pits squeezed out by the semi-circular protrusion 421 can be vibrated flat.

[0052] To further enhance the pressing effect and forming density, this invention applies a vibration action along the length of the straw block during the holding pressure stage, expanding the direction of active pressing. The specific structure is as follows: (See details) Figure 5 and Figure 8 The outer side of the mold 3 is provided with tamping blocks 53 that slide radially along its circumference at equal intervals. The tamping blocks 53 are located between two extrusion holes on the mold 3.

[0053] See Figure 5 , Figure 7 , Figure 8 and Figure 10The tamping block 53 has an inclined surface. Several drive plates 531 corresponding to the tamping block 53 are vertically slidably arranged on the upper side of the mold 3. A reset spring is provided between the drive plate 531 and the mold 3. The lower side of the drive plate 531 is inclined and slidably connected to the tamping block 53 for pushing the tamping block 53 outward. Several wedge plates 313 are fixedly installed at equal intervals along the circumference of the outer side of the drive ring 31.

[0054] When the pressure plate 51 drives the square hole with straw blocks to rotate completely away from the extrusion hole of the mold 3, the square hole with straw blocks rotates to correspond with the tamping block 53. Then, the rotating drive ring 31 drives the wedge-shaped surface of the wedge plate 313 to contact the upper end of the drive plate 531, so that the wedge plate 313 pushes the drive plate 531 downward and compresses the return spring, so that the drive plate 531 pushes the tamping block 53 outward and extends into the square hole of the pressure plate 51, thereby tamping and pressing the straw blocks under pressure along the length direction of the straw blocks, further enhancing the pressing effect and molding density.

[0055] It should be noted that the rotation speed of the drive ring 31 in this invention is constant, and the hydraulic cylinder 54 is selected from the existing technology that can quickly move its extension section. Through the adjustment of the timing of the contact between the drive ring 31 and the wedge plate 313 and the drive plate 531 by those skilled in the art, the hydraulic cylinder 54 can complete the rotation of the pressure plate 51 when the tamping block 53 has not extended.

[0056] To facilitate the smooth ejection of straw blocks from the square holes of the pressure-holding plate 51 after pressure holding, and to reduce the excessive expansion of straw blocks under pressure along their length in the extrusion holes of the mold 3, which would result in poor active pressing of the straw blocks, the present invention designs the following structure: (See reference) Figure 5 , Figure 9 and Figure 10 The pressure holding plate 51 has a swing block 511 hinged on both the upper and lower sides of the square hole. The swing block 511 has two pressing rods 512 located on both sides of the hinge axis of the swing block 511, respectively, and the slot on the side away from the middle of the square hole of the pressure holding plate 51 is connected to the swing block 511. The pressing rods 512 are vertically slidably connected to the pressure holding plate 51.

[0057] See Figure 1 , Figure 5 ,and Figure 9 Two inner track rings 513 and two outer track rings 514 are symmetrically arranged above and below the pressure plate 51 and fixedly installed on the housing 1. The inner track rings 513 and the outer track rings 514 are respectively used to press the inner and outer pressing rods 512 on the swing block 511.

[0058] When the square hole of the pressure holding plate 51 corresponds to the extrusion hole of the mold 3, the two vertically arranged pressing rods 512 at the square hole and close to the axis of the mold 3 are pushed by the inner track ring 513, causing the pressing rods 512 to move closer to the inside of the square hole. This causes the pressing rods 512 to push the corresponding swing block 511 to deflect, which increases the outlet of the square hole of the pressure holding plate 51 and decreases the inlet of the square hole of the pressure holding plate 51. This reduces the frictional resistance of the straw block moving out of the square hole of the pressure holding plate 51 after the pressure holding is completed. It can also impede the straw block moving from the extrusion hole of the mold 3 into the square hole of the pressure holding plate 51, reducing the excessive expansion of the straw block under pressure on the side of the extrusion hole of the mold 3 along its length, thereby improving the pressing effect.

[0059] It should be noted that both the two outer track rings 514 and the two inner track rings 513 are provided with several protrusions arranged at equal intervals along their circumference on the side where they are close to each other. The protrusions on the outer track rings 514 and the inner track rings 513 are staggered. The outer track rings 514 and the inner track rings 513 push the corresponding pressure rods 512 to move into the pressure plate 51 through the protrusions on them.

[0060] When the square hole of the pressure holding plate 51 corresponds to the tamping block 53, the outer track ring 514 pushes the two vertically arranged pressing rods 512 away from the axis of the mold 3, causing the swing block 511 to deflect and reset, so that during pressure holding, the side of the swing block 511 close to the inside of the square hole of the pressure holding plate 51 is horizontal.

[0061] It should be noted that, during the pressure holding process, the tamping block 53 pushes the straw block from the inside out, causing the end of the straw block closest to the axis of the mold 3 to compress outwards. This ensures that when the swing block 511 deflects later, the end of the swing block 511 closest to the axis of the mold 3 will not be unable to deflect due to being squeezed onto the straw block after the pressure holding process.

[0062] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to 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 invention.

[0063] Furthermore, the terms "first," "second," "number one," and "number two" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," "number one," or "number two" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0064] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0065] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A biomass straw briquette forming machine, comprising a shell, an extrusion mechanism arranged on the shell, and a mold fixedly installed on the upper side of the shell, characterized in that, The forming machine further comprises an extrusion mechanism for actively extruding the material inside the mold, and a shaping structure for pressure maintaining after the straw block is formed; The extrusion mechanism comprises a plurality of side pressing plates arranged on the inner side of the mold in equal intervals along the circumference of the mold and arranged to slide along the tangential direction of the mold, the side pressing plates being located at the left part of the extrusion hole of the mold, and a plurality of lower pressing plates being arranged on the inner side of the mold in equal intervals along the circumference of the mold and arranged to slide up and down, the lower pressing plates being located at the upper part of the extrusion hole of the mold; The shaping structure comprises a pressure maintaining disc rotatably arranged on the outer side of the mold, a square hole being arranged on the pressure maintaining disc in equal intervals along the circumference of the pressure maintaining disc and arranged along the radial direction of the pressure maintaining disc, the number of the extrusion holes of the mold being half of the number of the square holes, a blocking ring rotatably arranged on the outer side of the pressure maintaining disc and fixedly connected to the housing, and a through slot being arranged on the blocking ring in one-to-one correspondence with the extrusion holes of the mold; During the pressing, the extrusion mechanism pushes the material inside the housing to the inside of the extrusion hole of the mold, and then the side pressing plates and the lower pressing plates are alternately moved to actively extrude the material, when the material is pushed to fill the square holes of the pressure maintaining disc, the pressure maintaining disc is rotated to cause the blocking ring to close the two ends of the square holes of the mold to perform pressure maintaining and shaping. The lower side of the lower pressing plate is fixedly provided with a plurality of semicircular protrusions arranged in an array at a position close to the axis of the mold, and the lower pressing plate diffusively extrudes the material through the semicircular protrusions. The upper side of the side pressing plate is fixedly provided with a linkage column extending upward to the upper part of the mold, and the upper side of the lower pressing plate is fixedly provided with a connecting column extending upward to the upper part of the mold, the upper part of the linkage column and the connecting column each being in a beveled structure. The upper side of the mold is rotatably provided with a driving ring, and the rear side of the housing is fixedly provided with a synchronous motor, the output shaft of the synchronous motor being connected to the driving ring through a belt and driving the driving ring to rotate. The lower side of the driving ring is fixedly provided with a plurality of spring damping rods in equal intervals along the circumference of the driving ring and in correspondence with the number of the extrusion holes of the mold, the lower side of the spring damping rod being fixedly provided with a beveled block for alternately pushing the lower pressing plate and the side pressing plate, and the outer side of the driving ring is fixedly provided with a plurality of wedge-shaped plates in equal intervals along the circumference of the driving ring. The outer side of the mold is provided with a tamping block arranged to slide along the radial direction of the mold in equal intervals along the circumference of the mold, the tamping block being located between two extrusion holes on the mold. The tamping block is provided with a beveled surface, and the upper side of the mold is vertically provided with a plurality of driving plates in one-to-one correspondence with the tamping block, a return spring being arranged between the driving plate and the mold, the lower side of the driving plate being in a beveled surface and being slidably connected to the tamping block for pushing the tamping block outward.

2. The biomass straw briquetting machine according to claim 1, characterized in that, The square hole of the pressure maintaining disc is hingedly provided with a swing block on both the upper side and the lower side of the square hole, the side slot of the swing block away from the central part of the square hole of the pressure maintaining disc being fittedly connected to two pressing rods respectively located on both sides of the hinging axis of the swing block, the pressing rods being vertically slidably connected to the pressure maintaining disc.

3. The biomass straw briquetting machine according to claim 2, characterized in that, The housing is fixedly provided with two inner track rings symmetrically arranged at the upper and lower positions of the pressure maintaining disc, and two outer track rings symmetrically arranged at the upper and lower positions of the pressure maintaining disc, the inner track rings and the outer track rings respectively pressing the pressing rods on the inner side and the outer side of the swing block.

4. The biomass straw briquetting machine according to claim 1, characterized in that, Hydraulic cylinders are hingedly arranged between the housing and the pressure maintaining disc for driving the pressure maintaining disc to reciprocatingly rotate, the hydraulic cylinders driving the pressure maintaining disc to reciprocatingly rotate, so that the two adjacent square holes on the pressure maintaining disc alternately correspond to the same extrusion hole of the mold.

Images