overhang cutting assembly

Abstract

The application discloses a shearing and expanding cutter assembly, which comprises two hingedly connected cutter parts, and the cutter part is provided with a shearing blade; in the axial direction of the hinge shaft of the two cutter parts, the side of the cutter part away from the shearing blade is provided with a clearance slot; when the two cutter parts are in a closed state, the shearing blade of any cutter part is located in the clearance slot of the other cutter part, so that the two cutter parts are aligned. The clearance part of one cutter part provides accommodation space for the shearing blade of the other cutter part, so that the two cutter parts are aligned, good shearing and expanding functions are realized, and the clearance slot has a certain protection effect on the shearing blade, so that direct collision of the cutter parts is prevented, wear is reduced, and the shearing quality is improved.

Description

Technical Field

[0001] This application relates to the field of rescue equipment, and in particular to a scissor-spreader assembly. Background Technology

[0002] A cutter spreader is a rescue and demolition tool used in vehicle accidents, building collapses, fires, earthquakes, and other natural disasters. It uses its cutting or spreading functions to break up various metal or non-metal structures to carry out rescue operations.

[0003] In existing technologies, the two blades of the spreader are staggered, which makes the cutting edges prone to wear and results in poor cutting quality. Furthermore, the misalignment of the two blades also leads to poor expansion effect. In addition, existing spreaders have limited functionality and cannot meet the needs of tearing and opening in rescue situations, which is quite inconvenient. Utility Model Content

[0004] In view of the above problems, this application provides a shearing and expanding knife assembly to solve the problems of poor quality and limited functionality during shearing and expanding, and to meet multiple needs such as shearing, expanding, tearing and slit opening.

[0005] An embodiment of this application provides a scissor-spreader assembly, including two blade portions hinged together, each blade portion having a shearing edge;

[0006] Along the axial direction of the hinge axis of the two blade portions, a clearance groove is provided on the side of the blade portion facing away from the shearing blade;

[0007] When the two blade sections are in a closed state, the shearing edge of one blade section is located in the clearance groove of the other blade section so that the two blade sections are aligned.

[0008] In some embodiments, the blade tip is provided with an auxiliary blade, the blade surface of the auxiliary blade located on one side of the shearing blade is a first blade surface, the blade surface of the auxiliary blade located on one side of the blade back is a second blade surface, and the first blade surface and the second blade surface of the auxiliary blade are connected at an acute angle.

[0009] In some embodiments, the projection of the first cutting surface along the axial direction of the hinge axis of the two blade portions is a straight line, and the projection of the second cutting surface along the axial direction of the hinge axis of the two blade portions is composed of multiple connected broken lines, and the angle between each broken line and the straight line is an acute angle.

[0010] In some embodiments, the first surface of the blade portion having the relief groove has a first descending step structure from the back of the blade towards the shearing edge. The first descending step structure includes a first high platform near the back of the blade, a first low platform near the shearing edge, and a first sidewall connecting the first high platform and the first low platform. The first sidewall and the first low platform constitute the relief groove.

[0011] In some embodiments, the blade tip is provided with an auxiliary blade, the first high platform extends towards the blade tip and terminates at the auxiliary blade, and the second sidewall between the end of the first high platform closest to the blade tip and the first low platform is an inclined surface.

[0012] And / or, the first sidewall includes a tail sidewall section and a tip sidewall section, the tip sidewall section being closer to the tip than the tail sidewall section, the distance between the tip sidewall section and the shearing blade being less than the distance between the tail sidewall section and the shearing blade, and the tip sidewall section serving as a blade abutment to abut the shearing blade of the other blade section when the two blade sections are closed.

[0013] In some embodiments, the cutting edge of the shearing blade is toothed.

[0014] In some embodiments, the second side of the blade portion facing away from the relief groove has a second descending step structure from the tail to the tip. The second descending step structure includes a second high platform near the tail, a second low platform near the tip, and a third sidewall connecting the second high platform and the second low platform.

[0015] Wherein, the third sidewall is an inclined surface, and / or, the back of the blade on the second low platform is toothed.

[0016] In some embodiments, the scissor-spreader assembly further includes two movable connecting plates and a connector;

[0017] The first ends of the two movable connecting plates are respectively hinged to the tails of the two blades, the second ends of the two movable connecting plates are hinged to the third end of the connector, and the fourth end of the connector can receive driving force, thereby driving the two blades to open or close.

[0018] In some embodiments, the second ends of the two movable connecting plates are provided with first through holes, the third ends are provided with first U-shaped clamps, the two clamping arms of the first U-shaped clamps are provided with second through holes, the second ends of the two movable connecting plates are clamped between the two clamping arms of the first U-shaped clamps, and a first connecting shaft passes through each of the first and second through holes to achieve hinged connection between the two movable connecting plates and the connecting member; and / or,

[0019] The first surface of the blade portion with the clearance groove has a first descending step structure from the back of the blade towards the shearing edge. The first descending step structure includes a first high platform near the back of the blade. The blade portion has a second U-shaped clamp at the first tail corresponding to the first high platform. The two clamping arms of the second U-shaped clamp are axially arranged on the hinge axis of the two blade portions and are provided with a third through hole. The first ends of the two movable connecting plates are provided with a fourth through hole. The first end of each movable connecting plate is clamped between the two clamping arms of the second U-shaped clamp of the corresponding blade portion, and the second connecting shaft passes through each of the third and fourth through holes to realize the hinge between the movable connecting plate and the corresponding blade portion.

[0020] In some embodiments, the scissor-spreader assembly further includes a fixing rod, which is hollow to accommodate the connector. A third U-shaped clamp is provided at one end of the fixing rod near the blade portion. The two clamping arms of the third U-shaped clamp have fifth through holes. The first surface of the blade portion with the relief groove has a first descending stepped structure from the back of the blade towards the shearing edge. The first descending stepped structure includes a first low platform near the shearing edge. A sixth through hole is provided at the second blade tail of the blade portion corresponding to the first low platform. The second blade tails of the two blade portions are clamped between the two clamping arms of the third U-shaped clamp, and a third connecting shaft passes through each of the fifth and sixth through holes to achieve hinged connection between the two blade portions and the fixing rod. The two blade portions rotate around the third connecting shaft and are driven by the connector to achieve an open or closed state.

[0021] Unlike existing technologies, the beneficial effects of the embodiments of this application are: the clearance portion of one blade provides a space for the shearing blade of the other blade, so that the two blades are aligned to achieve good shearing and expansion functions; and the clearance groove has a certain protective effect on the shearing blade, preventing the blades from directly colliding and causing wear, thus improving the shearing quality.

[0022] Preferably, an auxiliary blade is provided at the tip of the blade. The auxiliary blade is located at an acute angle between the first cutting surface on one side of the shearing blade and the second cutting surface on the back of the blade. The auxiliary blade enables the shearing and spreading blade assembly to also have good tearing and slit-opening functions. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0024] Figure 1This is a schematic diagram of the structure of the scissor-spreader assembly provided in the embodiments of this application;

[0025] Figure 2 This is a schematic diagram of the structure of the two blade sections of the scissor-spreader assembly provided in the embodiments of this application;

[0026] Figure 3 yes Figure 2 Enlarged diagram of section A in the middle;

[0027] Figure 4 This is a schematic diagram of a partial structure of the blade portion of the scissor-spreader assembly provided in an embodiment of this application;

[0028] Figure 5 This is a schematic diagram showing the axial projection of the auxiliary blade in the hinge axis of the two blade sections in the scissor spreader assembly provided in this application embodiment;

[0029] Figure 6 This is a schematic diagram of the blade portion of the scissor-spreader assembly provided in this application from a certain perspective;

[0030] Figure 7 This is a schematic diagram of the blade portion of the scissor-spreader assembly provided in this application embodiment from another perspective;

[0031] Figure 8 This is a schematic diagram of the structure of the scissor-spreader assembly (excluding the fixing rod) provided in the embodiments of this application;

[0032] Figure 9 This is another structural schematic diagram of the scissor-spreader assembly provided in the embodiments of this application;

[0033] Figure 10 yes Figure 9 A schematic cross-sectional view of the scissor-spreader assembly;

[0034] Figure 11 yes Figure 9 A schematic diagram of a partial structure in cross-section;

[0035] Figure 12 yes Figure 9 A schematic diagram illustrating the working principle of the reversing valve in a shearing and spreading blade assembly.

[0036] Figure label:

[0037] 10-Blade section; 101-First face; 102-Second face; 11-Shearing blade; 12-Blade back; 13-Allowing groove; 131-First low platform; 132-Sixth through hole; 14-First high platform; 141-Third through hole; 15-First sidewall; 151-Blade tail sidewall section; 152-Blade tip sidewall section; 16-Second sidewall; 17-Second high platform; 18-Second low platform; 19-Third sidewall; 20-Auxiliary blade; 21-First cutting surface; 211-Straight line; 22-Second cutting surface; 221-First zigzag line; 222-Second zigzag line; 30-Modible connecting plate; 31-First end; 32-Second end; 33-Second connecting shaft; 40-Connector; 41-Third end; 42-Fourth end ; 43-First connecting shaft; 50-Fixed rod; 51-Third connecting shaft; 60-Manual hydraulic device; 601-Working end; 61-Hydraulic pump; 611-Plunger; 612-Oil supply channel; 613-Oil bladder; 614-Oil inlet port; 615-Oil outlet port; 616-Side wall oil port; 617-First ball reversing valve; 618-Second ball reversing valve; 619-Hand lever; 62-Reversing valve; 621-Reversing handle; 63-Hydraulic cylinder; 631-Piston body; 632-Guide rod; 633-Piston; 634-Piston rod; 635-First oil chamber; 636-Second oil chamber; 637-First stepped surface; 638-Second stepped surface; E-Axial direction of the hinge shaft of the two blade sections. Detailed Implementation

[0038] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0039] like Figure 1 and Figure 2 As shown, an embodiment of this application provides a scissor-spreader assembly, including two hinged blade portions 10, each blade portion 10 having a shearing edge 11 and a blade back 12.

[0040] Along the axial direction of the hinge axis (i.e., the third connecting shaft 51 hereinafter) of the two blade portions 10, a clearance groove 13 is provided on the side of the blade portion 10 facing away from the shearing blade 11; when the two blade portions are in the closed state, the shearing blade 11 of any blade portion 10 is located within the clearance groove 13 of the other blade portion 10, so that the two blade portions 10 are aligned. (Refer to...) Figure 1 and Figure 2 The direction E indicates the axial direction of the hinge axis of the two blade parts 10. The two blade parts 10 are hinged together in the direction E, and the rotation direction of the two blade parts 10 is perpendicular to the direction E.

[0041] Typically, the blade section 10 with shearing and expanding function has a shearing and expanding area connected to the blade tip and a hinged area connected to the blade tail. The alignment described in this application should be understood as the shearing and expanding areas of the two blade sections 10 not being completely misaligned; that is, the projections of the shearing and expanding areas of the two blade sections 10 in the rotation direction at least partially overlap. In a specific embodiment, the alignment of the two blade sections 10 can be such that, in the rotation direction of the blade sections 10, the shearing and expanding areas of the two blade sections 10 are flush, that is, the projections of the shearing and expanding areas of the two blade sections 10 in the rotation direction completely overlap. This can evenly distribute the shearing force, reduce stress concentration on one side, and at the same time, alignment can ensure the quality of expansion and avoid the problem of poor expansion accuracy when the two blade sections 10 are misaligned.

[0042] Specifically, the clearance groove 13 is an L-shaped notch provided on the side of the blade portion 10 facing away from the shearing blade 11 in the direction E (i.e., the first surface 101 below), near the shearing blade 11. The clearance groove of one blade portion provides a space to accommodate the shearing blade of the other blade portion.

[0043] In this embodiment, the relief groove of one blade provides a space to accommodate the shearing blade of the other blade, so that the two blades are aligned. Through the flush part of the two blades, good shearing and expansion functions are achieved. In addition, the relief groove has a certain protective effect on the shearing blade, preventing the blades from directly colliding and causing wear, thus improving the shearing quality.

[0044] Typically, the side where the back of the blade 12 is located is thicker than the side where the shearing blade 11 is located, which can provide structural strength and improve the overall rigidity of the blade part 10; and the thicker back of the blade 12 can disperse the stress concentration when the shearing blade 11 is subjected to force, avoiding local deformation.

[0045] As an optional implementation method, such as Figures 2 to 4 As shown, the blade tip of the blade section 10 is provided with an auxiliary blade 20, for example... Figure 3 The dotted line in the diagram indicates the auxiliary cutting edge 20, which should be understood. Figure 3 The following is an illustration of the division of auxiliary blade 20. In practice, auxiliary blade 20 can also be understood as... Figure 3 The middle dashed line is closer to the smaller tip of the blade, or... Figure 3 The dotted line is closer to the larger tip of the blade; in short, the auxiliary edge 20 includes the very tip of the blade portion. (See reference) Figure 4The circled area around the blade tip is the auxiliary blade 20. The blade face of the auxiliary blade 20 located on one side of the shearing blade 11 is the first blade face 21, and the blade face of the auxiliary blade 20 located on the other side of the blade back 12 is the second blade face 22. The first blade face 21 and the second blade face 22 of the auxiliary blade 20 are connected at an acute angle. In this embodiment, the auxiliary blade 20 is located at the tip of the blade part 10, and the first blade face 21 and the second blade face 22 are connected at an acute angle. This makes the blade tip sharp and pointed, with a sharp cone-shaped tip, which enhances impact resistance and gives the shearing and spreading blade assembly good tearing and slit-opening functions.

[0046] It should be noted that, in the embodiments of this application, the blade tip of the blade portion 10 is the location of the auxiliary blade 20; the blade tip point of the blade portion 10 is the sharpest part at the front end of the blade portion, and the blade tip point is a part of the blade tip; the first cutting surface 21 of the auxiliary blade 20 and the cutting surface of the shearing blade 11 are located in the same inclined plane and are connected.

[0047] As an optional implementation method, such as Figure 5 As shown, the projection of the first cutting surface 21 along the axial direction of the hinge axis of the two blade sections 10 is a straight line 211, and the projection of the second cutting surface 22 along the axial direction of the hinge axis of the two blade sections 10 is composed of multiple connected broken lines, with each broken line forming an acute angle with the straight line 211. The multiple continuous broken lines indicate that the second cutting surface is a tortuous and continuous cutting surface, containing multiple small cutting surfaces, each of which is a cutting surface. This can, to a certain extent, disperse the concentrated stress during the tearing and slitting process, increase the cutting surface area, disperse wear, and improve the service life of the shearing and slitting assembly. Since each broken line forms an acute angle with the straight line 211, each small cutting surface is inclined from the tip to the tail on the back side of the blade, effectively ensuring the sharpness of the blade tip and improving the tearing and slitting effect.

[0048] As an optional implementation, the multiple connected broken lines include a first broken line 221, a second broken line 222, and a third broken line 223 connected in sequence, wherein the angle between the first broken line 221 and the straight line 211 is greater than the angle between the second broken line 222 and the straight line 211. (Refer to...) Figure 5 The first fold line 221, the second fold line 222, and the third fold line 223 are connected sequentially from the tip of the blade to the tail. The angle between the first fold line 221 and the straight line 211 is greater than the angle between the second fold line 222 and the straight line 211. In this way, the second cutting surface can form a progressive cutting angle, so that the cutting surface cuts into the target at a larger angle first, and then gradually reduces the angle, thereby reducing the initial resistance and improving the penetration efficiency. This avoids the problem of easy chipping of the blade surface with a single angle, and thus effectively improves the tearing and slitting effect.

[0049] As an optional implementation, among the angles between each broken line and the straight line 211, the broken line furthest from the straight line 211 (e.g., Figure 5The angle between the third broken line (223) and the straight line (211) is the smallest. The furthest broken line makes the end of the second cutting surface form a gentler cutting angle, reducing the initial penetration resistance and improving the tearing and slit-opening effect.

[0050] As an optional implementation method, such as Figure 6 and Figure 7 As shown, the blade portion 10 has two opposing sides, wherein the side with the relief groove 13 is the first side 101, and the side facing away from the relief groove 13 is the second side 102. The first side 101 has a first descending step structure from the back of the blade 12 toward the shearing edge 11. The first descending step structure includes a first high platform 14 near the back of the blade 12, a first low platform 131 near the shearing edge 11, and a first sidewall 15 connecting the first high platform 14 and the first low platform 131. The first sidewall 15 and the first low platform 131 form the relief groove 13. The first high platform 14 forms a reinforcing structure on the side where the back of the blade 12 is located, improving the structural strength of the blade portion 10; the first sidewall 15 and the first low platform 131 form the relief groove 13, which provides a receiving space for the shearing edge 11 when the two blade portions 10 are in a closed state, and provides conditions for the two blade portions 10 to be aligned.

[0051] refer to Figures 1 to 8 In one specific embodiment, the distance between the first raised platform 14 of the blade portion 10 and the second surface 102 of the back relief groove 13 is a first dimension, and the groove height of the relief groove 13 (i.e., the height of the first sidewall 15) is a second dimension. Preferably, the second dimension is half of the first dimension. In this way, the portion between the first raised platform 14 of each blade portion 10 and the second surface 102 of the back relief groove 13 is aligned in the rotation direction of the blade portion 10. In other words, the first raised platform 14 of one blade portion and the second surface 102 of the back relief groove 13 of another blade portion are flush in the rotation direction of the blade portions. This not only evenly distributes the shearing force and improves the shearing effect, but also utilizes the flush portion to achieve a good expansion function.

[0052] As an optional implementation method, such as Figure 3 and Figure 4 As shown, the blade section 10 has an auxiliary blade 20 at its tip. The first high platform 14 extends towards the blade tip and terminates at the auxiliary blade 20. The second sidewall 16 between the end of the first high platform 14 closest to the blade tip and the first low platform 131 is an inclined surface. That is, the first high platform 14 is not connected to the blade tip of the blade section 10, but is connected to the first low platform 131 through the inclined second sidewall 16. In this way, the auxiliary blade 20 is an exposed tip relative to the first high platform 14, which gives the scissor-spreader assembly good tearing and slit-opening functions.

[0053] As an optional implementation method, such as Figure 6As shown, the first sidewall 15 includes a tail sidewall section 151 and a tip sidewall section 152. The tip sidewall section 152 is closer to the tip than the tail sidewall section 151. The distance between the tip sidewall section 152 and the shearing blade 11 is less than the distance between the tail sidewall section 151 and the shearing blade 11. The tip sidewall section 152 serves as a blade abutment to abut against the shearing blade 11 of the other blade section 10 when the two blade sections 10 are closed.

[0054] Reference Figure 6 In one blade section, the distance between the tip sidewall section 152 and the shearing blade 11 is less than the distance between the tail sidewall section 151 and the shearing blade 11; combined Figure 2 When the two blade sections 10 are closed, the distance between the tip sidewall section 152 of one blade section and the shearing edge 11 of the other blade section is smaller than the distance between the tail sidewall section 151 of the same blade section and the shearing edge 11 of the other blade section. This design allows for a smaller distance at the tip, creating a high stress concentration zone during the initial shearing phase, while the increased distance at the tail disperses stress during the later stages of shearing, preventing the root of the shearing edge from cracking due to continuous stress. Furthermore, the tip sidewall section 152, acting as a blade abutment, provides a stopping effect when the two blade sections 10 are closed, effectively preventing excessive rotation of the blade sections 10 and extending the service life of the shearing and spreading assembly.

[0055] As an optional implementation, the cutting edge 11 has a toothed surface, which can increase friction when in contact with the target, effectively fix the target and prevent slippage; at the same time, it can make the cutting action easier.

[0056] As an optional implementation method, such as Figure 7 As shown, the second surface 102 of the blade portion 10 facing away from the relief groove 13 has a second descending step structure from the tail to the tip. The second descending step structure includes a second high platform 17 near the tail, a second low platform 18 near the tip, and a third sidewall 19 connecting the second high platform 17 and the second low platform 18. The third sidewall 19 is a slope, and / or the back of the second low platform 18 is toothed.

[0057] Along the axial direction of the hinge axis of the two blade sections 10, the tail portion corresponding to the second high platform 17 forms a reinforcing structure to facilitate the setting of a through hole for connection.

[0058] The third sidewall 19 is the transition surface between the second high platform 17 and the second low platform 18. It can be a slope or an arc-shaped surface that is concave from the second high platform 17 to the second low platform 18. This can avoid the problem of stress concentration during shearing. A slope is easier to implement than an arc-shaped surface. Preferably, the third sidewall 19 is a slope.

[0059] The second low platform 18 is connected to the blade tip. The back of the blade of the second low platform 18 is serrated, which can play a non-slip role when expanding, tearing, or opening.

[0060] Based on this, the alignment of the two blade portions 10 in this application is further understood according to the high and low platform surfaces. From the blade tip to the blade tail, the portion of the blade portion 10 corresponding to the second low platform surface 18 is the shearing and spreading zone, and the portion of the blade portion 10 corresponding to the second high platform surface 17 is the hinge zone. The alignment of the two blade portions 10 specifically means that, in the rotation direction of the two blade portions 10, the portions of the two blade portions 10 corresponding to the second low platform surface 18 are flush, thus ensuring that the shearing and spreading blade assembly has good shearing and spreading functions.

[0061] As an optional implementation method, such as Figure 8 As shown, the scissor spreader assembly also includes two movable connecting plates 30 and a connector 40. The first ends 31 of the two movable connecting plates 30 are respectively hinged to the tails of the two blade sections 10. The second ends 32 of the two movable connecting plates 30 are hinged to the third ends 41 of the connector 40. The fourth end 42 of the connector 40 can receive driving force, thereby driving the two blade sections 10 to open or close through the connector 40. When the connector 40 moves towards the hinged portion of the two blade sections 10, the two blade sections 10 open; when the connector 40 moves away from the hinged portion of the two blade sections 10, the two blade sections 10 close.

[0062] As an optional implementation method, refer to Figure 8 The two movable connecting plates 30 have a first through hole (not shown) at their second ends 32 and a first U-shaped clamp at their third ends 41. The two clamping arms of the first U-shaped clamp have second through holes (not shown). The second ends 32 of the two movable connecting plates 30 are clamped between the two clamping arms of the first U-shaped clamp. A first connecting shaft 43 passes through each of the first and second through holes to achieve hinged connection between the two movable connecting plates 30 and the connecting member 40. The two blade sections 10 are hinged together, and the connecting member 40 drives the two movable connecting plates 30 to move, thereby opening and closing the two blade sections 10.

[0063] As an optional implementation method, such as Figure 2 and Figure 6 As shown, the first surface 101 of the blade portion 10, which has a clearance groove 13, has a first descending stepped structure in the direction from the blade back 12 to the shearing edge 11. The first descending stepped structure includes a first high platform 14 near the blade back 12 and a first low platform 131 near the shearing edge 11; and, as Figure 2 and Figure 7 As shown, the second surface 102 of the blade portion 10 facing away from the relief groove 13 has a second descending step structure from the tail to the tip. The second descending step structure includes a second high platform 17 near the tail and a second low platform 18 near the tip.

[0064] It is understandable that the part of the blade portion 10 that simultaneously corresponds to the first high platform 14 and the second high platform 17 is the thickest part of the blade portion 10, the part of the blade portion 10 that simultaneously corresponds to the first low platform 131 and the second low platform 18 is the thinnest part of the blade portion 10, and the thickness of the part of the blade portion 10 that simultaneously corresponds to the second high platform 17 and the first low platform 131 is between the thickest and the thinnest.

[0065] Furthermore, a second U-shaped clamp is formed at the first blade tail of the blade part 10 corresponding to the first high platform 14. The two clamping arms of the second U-shaped clamp are arranged axially in the hinge of the two blade parts 10 and are provided with a third through hole 141. The first end 31 of the two movable connecting plates 30 is provided with a fourth through hole (not shown). The first end 31 of each movable connecting plate is clamped between the two clamping arms of the second U-shaped clamp of the corresponding blade part 10, and the second connecting shaft 33 passes through each third through hole 141 and the fourth through hole to realize the hinge of the movable connecting plate 30 with the corresponding blade part 10.

[0066] In this embodiment, the third through hole 141 simultaneously penetrates the first high platform 14 and the second high platform 17. The first cutter tail where the second U-shaped clamp is located is at the thickest part of the blade portion 10, which can ensure the structural strength of the second U-shaped clamp, improve its impact resistance, and enhance the overall fatigue resistance.

[0067] Furthermore, the scissor-spreader assembly also includes a fixing rod 50, which is hollow to accommodate the connector 40. The fixing rod 50 has a third U-shaped clamp at one end near the blade section 10, and the two clamping arms of the third U-shaped clamp have a fifth through hole (not shown). The blade section 10 has a sixth through hole 132 at the second blade tail corresponding to the first low platform 131. The second blade tails of the two blade sections 10 are clamped between the two clamping arms of the third U-shaped clamp, and the two blade sections 10 are hinged to the fixing rod 50 by the third connecting shaft 51 through the fifth through hole and the sixth through hole 132. The two blade sections 10 rotate around the third connecting shaft 51 and under the drive of the connector 40 to achieve an open or closed state.

[0068] In this embodiment, the sixth through hole 132 simultaneously penetrates the first low platform 131 and the second high platform 17. That is, the second cutting tail where the sixth through hole 132 is located is at the part of the cutting blade 10 that corresponds to both the second high platform 17 and the first low platform 131. The second cutting tail is not the thinnest part, which can ensure the strength of the joint between the cutting blade 10 and the third U-shaped clamp, improve the impact resistance, and enhance the overall fatigue resistance.

[0069] In some embodiments, the scissor and spreader assembly can be hydraulically driven. Specifically, the scissor and spreader assembly also includes a manual hydraulic device. Figures 9 to 11As shown, the manual hydraulic device 60 includes a hydraulic pump 61, a directional valve 62, and a hydraulic cylinder 63. The hydraulic pump 61 is connected to the hydraulic cylinder 63 via the directional valve 62. It is understood that the hydraulic medium used in the manual hydraulic device 60 can be, but is not limited to, hydraulic oil. For ease of description, hydraulic oil will be used as an example below.

[0070] Hydraulic pump 61 is a radial piston pump. For details, please refer to... Figure 10 and Figure 11 The hydraulic pump 61 includes a pump body, which is provided with a plunger cavity, an oil supply channel 612, an oil return channel (not shown) and an oil bladder 613. The plunger cavity accommodates the plunger 611. The oil supply channel 612 and the oil return channel are both connected to the oil bladder 613. The plunger cavity is connected to the side wall of the oil supply channel 612.

[0071] The oil supply channel 612 has an oil inlet port 614 and an oil outlet port 615 that are far apart from each other in the direction of oil flow. The oil inlet port 614 is connected to the oil sac 613. The side wall of the oil supply channel 612 is provided with a side wall oil port 616 that is connected to the plunger cavity.

[0072] From the oil inlet port 614 to the oil outlet port 615, the oil supply channel 612 has a first stepped surface 637 and a second stepped surface 638 inside. The through-hole diameter of the second stepped surface 638 is larger than that of the first stepped surface 637. The side wall oil port 616 is located adjacent to the first stepped surface 637. Furthermore, the oil supply channel 612 also sequentially includes a first ball-shaped directional valve 617, a first spring (not shown), a second ball-shaped directional valve 618, and a second spring (not shown). The first spring presses the first ball-shaped directional valve 617 against the first stepped surface 637, and the second spring presses the second ball-shaped directional valve 618 against the second stepped surface 638. Preferably, the first ball-shaped directional valve 617 is a first steel ball, and the second ball-shaped directional valve 618 is a second steel ball.

[0073] When the hand lever 619 moves upward, it drives the plunger 611 upward. At this time, the first ball valve 617 opens and the second ball valve 618 seals, and oil is drawn into the plunger cavity. When the hand lever 619 moves downward, it drives the plunger 611 downward. At this time, the first ball valve 617 seals and the second ball valve 618 opens, and the oil in the plunger cavity flows to the hydraulic cylinder 63 through the directional valve 62.

[0074] Furthermore, the hydraulic cylinder 63 includes a cylinder body, a piston body 631 disposed within the cylinder body, and a guide rod 632. The piston body 631 and the guide rod 632 are slidably engaged. The piston body 631 includes an integrally formed piston 633 and a piston rod 634. The inner cavity of the cylinder is divided by the piston body 631 into a first oil chamber 635 near the reversing valve 62 and a second oil chamber 636 away from the reversing valve 62, that is... Figure 11The right side of the piston 633 is the first oil chamber 635, and the left side is the second oil chamber 636; the guide rod 632 supplies oil to the second oil chamber 636. The end of the piston rod 634 away from the reversing valve 62 is the working end 601 of the manual hydraulic device 60.

[0075] Figure 10 and Figure 11 When piston 633 is located at the leftmost position of the sliding path, the first oil chamber 635 is in its largest space state, and the second oil chamber 636 is in its smallest space state. When piston 633 slides to the right, the first oil chamber 635 gradually decreases in size, and the second oil chamber 636 gradually increases in size.

[0076] Furthermore, referring to Figure 12 The reversing valve 62 is a three-position four-way reversing valve, which includes an oil inlet P, an oil return port O, a first working oil port A and a second working oil port B. The oil inlet P is connected to the oil outlet port 615; the working oil port A is connected to the second oil chamber 636, and the working oil port B is connected to the first oil chamber 635.

[0077] Reference Figure 9 The reversing valve 62 is equipped with a reversing handle 621, which has three working positions: center position, 45° forward rotation, and 45° reverse rotation. The reversing valve 62 determines whether the pressure oil from the plunger pump acts on the first oil chamber 635 or the second oil chamber 636. When the reversing handle 621 is in different working positions and the hand lever 619 is operated, the working process of the reversing valve 62 is as follows:

[0078] Reference Figure 12 (a) When the handle is stopped in the middle position, the oil inlet P is connected to the oil return port O, and the first working oil port A and the second working oil port B are both closed. At this time, the oil in the oil bladder 613 returns to the oil bladder 613 through the oil supply channel 612, the oil inlet P, the oil return port O, and the oil return channel.

[0079] Reference Figure 12 (b) When the handle is rotated 45° clockwise, the oil inlet P is connected to the second working oil port B, and the oil return port O is connected to the first working oil port A. At this time, oil enters the first oil chamber 635, oil returns to the second oil chamber 636, and the piston body 631 moves away from the reversing valve 62, causing the blade part of the shearing and expanding knife assembly to open, which can perform actions such as expansion, slit opening, and tearing.

[0080] Reference Figure 12 (c) When the handle is reversed 45°, the oil inlet P is connected to the first working oil port A, and the oil return port O is connected to the second working oil port B. At this time, oil enters the second oil chamber 636, oil returns to the first oil chamber 635, and the piston body 631 moves to the side where the reversing valve 62 is located, which drives the blade part of the shearing and spreading knife assembly to close and perform the shearing action.

[0081] In the description of this application, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., 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 application 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 application.

[0082] Furthermore, the terms "first" and "second" in this application are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such processes, methods, products, or apparatus.

[0083] The above description is merely an embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A scissor-spreader assembly, characterized in that, It includes two blade sections that are hinged together, each blade section having a shearing edge; Along the axial direction of the hinge axis of the two blade portions, a clearance groove is provided on the side of the blade portion facing away from the shearing blade; When the two blade sections are in a closed state, the shearing edge of one blade section is located in the clearance groove of the other blade section so that the two blade sections are aligned.

2. The scissor-spreader assembly according to claim 1, characterized in that, The blade tip is provided with an auxiliary blade. The blade surface of the auxiliary blade located on one side of the shearing blade is the first blade surface, and the blade surface of the auxiliary blade located on the back of the blade is the second blade surface. The first blade surface and the second blade surface of the auxiliary blade are connected at an acute angle.

3. The scissor-spreader assembly according to claim 2, characterized in that, The projection of the first cutting surface along the axial direction of the hinge axis of the two blade portions is a straight line, and the projection of the second cutting surface along the axial direction of the hinge axis of the two blade portions is multiple connected broken lines, and the angle between each broken line and the straight line is an acute angle.

4. The scissor-spreader assembly according to claim 1, characterized in that, The first surface of the blade portion having the relief groove has a first descending step structure from the back of the blade towards the shearing edge. The first descending step structure includes a first high platform near the back of the blade, a first low platform near the shearing edge, and a first sidewall connecting the first high platform and the first low platform. The first sidewall and the first low platform constitute the relief groove.

5. The scissor-spreader assembly according to claim 4, characterized in that, The blade tip is provided with an auxiliary blade. The first high platform extends towards the blade tip and ends at the auxiliary blade. The second sidewall between the end of the first high platform closest to the blade tip and the first low platform is an inclined surface. And / or, the first sidewall includes a tail sidewall section and a tip sidewall section, the tip sidewall section being closer to the tip than the tail sidewall section, the distance between the tip sidewall section and the shearing blade being less than the distance between the tail sidewall section and the shearing blade, and the tip sidewall section serving as a blade abutment to abut the shearing blade of the other blade section when the two blade sections are closed.

6. The scissor-spreader assembly according to claim 1, characterized in that, The cutting edge of the shearing blade is toothed.

7. The scissor-spreader assembly according to claim 1, characterized in that, The second side of the blade portion facing away from the relief groove has a second descending step structure from the tail to the tip. The second descending step structure includes a second high platform near the tail, a second low platform near the tip, and a third sidewall connecting the second high platform and the second low platform. Wherein, the third sidewall is an inclined surface, and / or, the back of the blade on the second low platform is toothed.

8. The scissor-spreader assembly according to claim 1, characterized in that, It also includes two movable connecting plates and connectors; The first ends of the two movable connecting plates are respectively hinged to the tails of the two blades, the second ends of the two movable connecting plates are hinged to the third end of the connector, and the fourth end of the connector can receive driving force, thereby driving the two blades to open or close.

9. The scissor-spreader assembly according to claim 8, characterized in that, The second ends of the two movable connecting plates are provided with first through holes, and the third ends are provided with first U-shaped clamps. The two clamping arms of the first U-shaped clamps are provided with second through holes. The second ends of the two movable connecting plates are clamped between the two clamping arms of the first U-shaped clamps, and a first connecting shaft passes through each of the first and second through holes to achieve hinged connection between the two movable connecting plates and the connecting member; and / or, The first surface of the blade portion with the clearance groove has a first descending step structure from the back of the blade towards the shearing edge. The first descending step structure includes a first high platform near the back of the blade. The blade portion has a second U-shaped clamp at the first tail corresponding to the first high platform. The two clamping arms of the second U-shaped clamp are axially arranged on the hinge axis of the two blade portions and are provided with a third through hole. The first ends of the two movable connecting plates are provided with a fourth through hole. The first end of each movable connecting plate is clamped between the two clamping arms of the second U-shaped clamp of the corresponding blade portion, and the second connecting shaft passes through each of the third and fourth through holes to realize the hinge between the movable connecting plate and the corresponding blade portion.

10. The scissor-spreader assembly according to claim 8, characterized in that, It also includes a fixing rod, which is hollow to accommodate the connecting member. The fixing rod has a third U-shaped clamp at one end near the blade portion. The two clamping arms of the third U-shaped clamp have fifth through holes. The first surface of the blade portion with the relief groove has a first descending step structure from the back of the blade towards the shearing edge. The first descending step structure includes a first low platform near the shearing edge. The blade portion has a sixth through hole at the second blade tail corresponding to the first low platform. The second blade tails of the two blade portions are clamped between the two clamping arms of the third U-shaped clamp. The two blade portions are hinged to the fixing rod by a third connecting shaft passing through the fifth and sixth through holes. The two blade portions rotate around the third connecting shaft and are driven by the connecting member to achieve an open or closed state.

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