Pressure mechanism

Abstract

The utility model discloses a pressure mechanism which comprises a support, a power element, an output shaft and a connecting rod assembly, the power element comprises a telescopic push rod, the connecting rod assembly comprises a power arm and an execution arm, and the power arm is hinged to the support, the push rod and the execution arm through a first hinge point, a second hinge point and a third hinge point respectively. When the pressure mechanism is in a reset state, the push rod is parallel to the output shaft, the power element drives the power arm to rotate through stretching of the push rod, and the power arm drives the output shaft to reciprocate linearly through the execution arm. According to the pressure mechanism, output force is amplified through the 90-degree power arm, the power element and the output force form force direction conversion of nearly 180 degrees, a compact structure is formed, the output force direction of the power arm is almost overlapped with the axis of the output shaft, the transmission efficiency of the output force is high, and the requirement for high output force is met.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical equipment, in particular to a pressure mechanism. Background Art

[0002] Many processing equipment, such as stamping machines, riveting machines, etc., usually use pressure mechanisms (hydraulic or pneumatic) to provide output force. Currently, many existing pressure mechanisms have complex structures, large volumes, unstable movements, large installation spaces, limited output forces, low transmission efficiency, and low transmission accuracy, making it difficult to ensure the stability of thrust. Utility Model Content

[0003] In view of the shortcomings of the prior art, the utility model provides a pressure mechanism with a simple and compact structure, low cost, high transmission efficiency and stable output force. To achieve the above purpose, the utility model is implemented through the following technical solutions:

[0004] A pressure mechanism includes a support, a power element, an output shaft and a connecting rod assembly, the power element includes a retractable push rod, the connecting rod assembly includes a power arm and an actuator arm, the power arm is respectively hinged to the support, the push rod and the actuator arm through a first hinge point, a second hinge point and a third hinge point, the line connecting the first hinge point and the second hinge point is perpendicular to the line connecting the first hinge point and the third hinge point, the first hinge point is located on the extension line of the axis of the output shaft, the push rod and the output shaft are parallel when the pressure mechanism is in a reset state, the power element drives the power arm to rotate by the extension and retraction of the push rod, and the power arm drives the output shaft to reciprocate linear motion through the actuator arm.

[0005] Furthermore, the power arm includes a first rod and a second rod connected vertically to each other, the length of the first rod is greater than the length of the second rod, the first rod is hinged to the push rod, and the second rod is hinged to the actuator arm, and the support is provided with a first limit block and a second limit block, and when the first rod rotates to contact the first limit block, the output stroke of the output shaft is limited, and when the second rod rotates to contact the second limit block, the return stroke of the output shaft is limited.

[0006] Furthermore, the first limiting block and the second limiting block are elastic limiting blocks.

[0007] Furthermore, the first limiting block and the second limiting block are both detachably connected to the support.

[0008] Furthermore, the power arm includes a first rod and a second rod connected vertically to each other, the first rod and the second rod form an L shape, the junction of the first rod and the second rod is hinged to the support through a first rotating shaft to form a first hinge point, the first rod is hinged to the push rod through a second rotating shaft at one end away from the second rod to form a second hinge point, the second rod is hinged to the actuator arm through a third rotating shaft at one end away from the first rod to form a third hinge point, the output shaft is fixedly connected to a connecting block near one end of the actuator arm, the lower end of the actuator arm is hinged to the connecting block through a fourth rotating shaft, and the axis of the fourth rotating shaft is located on the axis of the output shaft.

[0009] Furthermore, the first rotating shaft, the second rotating shaft, the third rotating shaft and the fourth rotating shaft are all connected to other components via oil-free bushings, and the output shaft is connected to the support via oil-free bushings.

[0010] Furthermore, the support includes a main body seat, two opposite side plates, and a connecting plate. The main body seat is located below the connecting plate. The connecting plate connects the upper ends of the two side plates. The lower parts of the two side plates are respectively fixedly connected to the opposite sides of the main body seat. The main body seat is provided with a vertical guide hole. The output shaft performs reciprocating linear motion in the vertical guide hole. The power element is hinged on one side of the main body seat. The connecting rod assembly is located above the power element and the output shaft and between the main body seat and the connecting plate. The two ends of the first rotating shaft are connected to the two side plates.

[0011] Furthermore, the support also includes a power source seat, which is fixed on one side of the main body seat. The power element also includes a cylinder body. The push rod is retractable relative to the cylinder body. The cylinder body is hinged on the power source seat. When the pressure mechanism is in a reset state, the cylinder body is parallel to the output shaft.

[0012] Furthermore, the first rod member and the second rod member are integrally formed.

[0013] Furthermore, a connection portion between the output shaft and the connection block is provided with a rotation-stopping structure for preventing the output shaft from rotating.

[0014] The utility model has the following beneficial effects:

[0015] 1. The connecting rod mechanism amplifies the output force through the 90° power arm to meet high output force requirements.

[0016] 2. The line connecting the first hinge point and the second hinge point of the power arm is perpendicular to the line connecting the first hinge point and the third hinge point. The first hinge point is located on the extension line of the axis of the output shaft. The power element and the output force form a nearly 180° force direction conversion, forming a compact structure. The output force direction of the power arm almost coincides with the axis of the output shaft, and the output force transmission efficiency is high.

[0017] 3. Oil-free bushings are set at each hinge point on the connecting rod mechanism to cooperate with the rotating shaft. The oil-free bushing can withstand heavy loads, avoid damage to the connecting rod mechanism by the rotating shaft, reduce maintenance costs, and can also make the connecting rod mechanism thinner, thereby saving space and manufacturing costs.

[0018] 4. The output shaft is located in the vertical guide hole of the main body seat and moves back and forth. An oil-free bushing is arranged between the output shaft and the vertical guide hole, so that the output shaft has higher running accuracy, avoids wear on the main body seat, and reduces maintenance costs.

[0019] 5. The power element is parallel to the output shaft, and the connecting rod assembly is located above the power element and the output shaft, occupying a smaller horizontal dimension. Therefore, the bracket can be set more compactly, reducing the cost of the bracket and saving the installation space of the bracket, and can adapt to more processing equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the pressure mechanism of the embodiment of the utility model in the reset state;

[0021] Figure 2 It is a schematic diagram of the pressure mechanism of the embodiment of the utility model in the output state;

[0022] Figure 3 yes Figure 2 Right side view of the pressure mechanism in the state. DETAILED DESCRIPTION

[0023] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0024] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0025] It should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0026] like Figures 1 to 3As shown, this embodiment discloses a pressure mechanism, including a support 1, a power element 2, an output shaft 3 and a connecting rod assembly, the power element 2 is hinged to the support 1, the power element 2 includes a retractable push rod 21, the connecting rod assembly includes a power arm 4 and an actuator arm 5, the power arm 4 is hinged to the support 1, the push rod 21 and the actuator arm 5 through a first hinge point, a second hinge point and a third hinge point respectively, the line connecting the first hinge point and the second hinge point is perpendicular to the line connecting the first hinge point and the third hinge point, the first hinge point is located on the extension line of the axis of the output shaft 3, the push rod 21 and the output shaft 3 are parallel when the pressure mechanism is in a reset state, the power element 2 drives the power arm 4 to rotate through the extension and retraction of the push rod 21, and the power arm 4 drives the output shaft 3 to reciprocate linearly through the actuator arm 5.

[0027] When the pressure mechanism is in the reset state, the push rod 21 is parallel to the output shaft 3. Compared with the inclined arrangement of the push rod 21 relative to the output shaft 3, the pressure mechanism provided by the utility model is more compact in structure when in the reset state, so the support 1 only requires a smaller size and material cost. The pressure mechanism is usually used to drive punching machines, riveting machines and other processing equipment that require a large output force. Only a small installation space is needed on these processing equipment for the support 1 to be installed. The pressure mechanism can match more models and types of processing equipment and has good practicality.

[0028] The line connecting the first hinge point (that is, the position of the first rotating shaft 8) and the second hinge point (that is, the position of the second rotating shaft 9) is perpendicular to the line connecting the first hinge point and the third hinge point (that is, the position of the third rotating shaft 10). The first hinge point is located on the extension line of the axis of the output shaft 3. When the pressure mechanism is in the output state, the push rod 21 of the power element 2 is extended to drive the second hinge point to move to a height close to the first hinge point (taking the vertical setting state of the output shaft 3 shown in the accompanying drawings as an example, the possibility of the pressure mechanism being installed in a horizontal state for use is not excluded). At this time, the third hinge point moves to an extension line close to the axis of the output shaft 3, that is, compared with the reset state, the output force direction of the power element 2 has changed by nearly 180°, and the direction of the force output by the power arm 4 almost coincides with the axis of the output shaft 3, so that the force output by the power arm 4 is transmitted to the output shaft 3 to the maximum extent, so that the output shaft 3 has a larger output force, and the radial force on the output shaft 3 is reduced as much as possible, thereby avoiding the problem of the output shaft 3 being broken by the radial shear force. The push rod 21 of the power element 2 performs a back-and-forth motion of extending and retracting, forming a continuous and efficient output.

[0029] The power arm 4 includes a first rod 41 and a second rod 42 connected vertically to each other. The length of the first rod 41 is greater than that of the second rod 42. The first rod 41 is hinged to the push rod 21, and the second rod 42 is hinged to the actuator arm 5. The support 1 is provided with a first limit block 6 and a second limit block 7. When the first rod 41 rotates to contact the first limit block 6, the stroke of the output shaft 3 is limited (such as Figure 2 ), the second rod 42 rotates to contact the second limit block 7 to limit the return stroke of the output shaft 3 (such as Figure 1 ). The length of the first rod 41 is greater than that of the second rod 42, and the output force is amplified by the power arm 4. The first limit block 6 and the second limit block 7 limit the moving stroke of the output shaft 3, ensuring the stability and accurate travel time of the output force of the output shaft 3, and also limiting the rotation angle of the power arm 4. The first limit block 6 and the second limit block 7 are preferably elastic limit blocks to prevent the power arm 4 from breaking due to a rigid collision with the support 1. The first limit block 6 and the second limit block 7 are both detachably connected to the support 1, so that by replacing the first limit block 6 and the second limit block 7, the distance between the first limit block 6 and the first rod 41, and the distance between the second limit block 7 and the second rod 42 can be adjusted, so that the stroke of the output shaft 3 can be adjusted according to different actual production conditions to obtain a more accurate output force.

[0030] The junction of the first rod 41 and the second rod 42 is hinged to the support 1 through the first rotating shaft 8 to form a first hinge point, the end of the first rod 41 away from the second rod 42 is hinged to the push rod 21 through the second rotating shaft 9 to form a second hinge point, the end of the second rod 42 away from the first rod 41 is hinged to the actuator arm 5 through the third rotating shaft 10 to form a third hinge point, the output shaft 3 is fixedly connected to a connecting block 11 at one end close to the actuator arm 5, the lower end of the actuator arm 5 is hinged to the connecting block 11 through the fourth rotating shaft 12, and the axis of the fourth rotating shaft 12 is located on the axis of the output shaft 3. The actuator arm 5 is connected to the output shaft 3 through the connecting block 11, rather than the actuator arm 5 being directly hinged to the output shaft 3, the fourth rotating shaft 12 is inserted in the connecting block 11, and the size of the connecting block 11 can be appropriately increased to ensure the strength of the connecting block 11 and avoid the connection block 11 from breaking. If a hole is directly machined on the output shaft 3 for the fourth rotating shaft 12 to pass through, the output shaft 3 needs to be set with a larger diameter to ensure the strength around the hole, which will increase the cost, and the output shaft 3 is long and inconvenient to machine. Therefore, by adding the connecting block 11, the strength of the mechanism is ensured to avoid breakage, and the processing of parts is also convenient.

[0031] The first rotating shaft 8, the second rotating shaft 9, the third rotating shaft 10 and the fourth rotating shaft 12 are all connected to other components through oil-free bushings, and the output shaft 3 is connected to the support 1 through oil-free bushings. The oil-free bushings can not only withstand heavy loads, but also prevent the shaft from wearing the hole, thereby reducing maintenance costs. By setting the oil-free bushings, the power arm 4 and the actuator arm 5 can be set thinner, thereby saving space and making the entire pressure mechanism structure more compact.

[0032] The output shaft 3 in this embodiment is vertically arranged, and the first rotating shaft 8 bears the weight of the connecting rod assembly and the output shaft 3, so the support of the first rotating shaft 8 by the support 1 is particularly important. The support 1 includes a main body seat 101, two opposite side plates 102, and a connecting plate 103. The main body seat 101 is located below the connecting plate 103, and the connecting plate 103 connects the upper ends of the two side plates 102. The lower parts of the two side plates 102 are respectively fixedly connected to the opposite sides of the main body seat 101. The main body seat 101 is provided with a vertical guide hole, and the output shaft 3 performs reciprocating linear motion in the vertical guide hole. The power element 2 is hinged on one side of the main body seat 101, and the connecting rod assembly is located above the power element 2 and the output shaft 3 and between the main body seat 101 and the connecting plate 103. The two ends of the first rotating shaft 8 are connected to the two side plates 102. The upper ends of the two side plates 102 are connected by a connecting plate 103, and the lower ends of the two side plates 102 are connected to the main seat 101. The support 1 has a simple and stable structure. The two side plates 102 provide good support for the first rotating shaft 8. The tension on the first rotating shaft 8 is distributed to the two side plates 102 through an oil-free bushing. The oil-free bushing can withstand heavy loads to prevent the tension on the first rotating shaft 8 from directly acting on the holes of the two side plates 102 (holes for the first rotating shaft 8 to pass through) and causing cracks around the holes. A vertical guide hole is set in the main seat 101 to guide the movement of the output shaft 3, thereby increasing the accuracy of the operation of the output shaft 3. An oil-free bushing is set between the output shaft 3 and the vertical guide hole. The oil-free bushing can not only withstand heavy loads, but also prevent the output shaft 3 from causing wear on the vertical guide hole, thereby reducing maintenance costs. By setting oil-free bushings on the power arm 4 and the actuator arm 5, the power arm 4 and the actuator arm 5 can be set to be thinner, so the distance between the two side plates 102 can be set to be narrower, the entire bracket structure is compact, the manufacturing cost is reduced, and the installation space occupied is small, which can adapt to the installation space of more equipment.

[0033] The support 1 also includes a power source seat 104, which is fixed on one side of the main body seat 101. The power element 2 also includes a cylinder 22. The push rod 21 is retractable relative to the cylinder 22. The cylinder 22 is hinged on the power source seat 104. When the pressure mechanism is in the reset state, the cylinder 22 is parallel to the output shaft 3. The power element 2 includes but is not limited to a hydraulic cylinder and a pneumatic cylinder. The power element 2 is arranged parallel to the output shaft 3, and the connecting rod assembly is arranged above the output shaft 3 and the power element 2, so that the pressure mechanism has a smaller horizontal dimension and occupies a smaller installation space on the machine table of the equipment.

[0034] Preferably, the first rod 41 and the second rod 42 are integrally formed, which reduces the installation steps and allows the power arm 4 to be set thinner to save space (if the first rod 41 and the second rod 42 are not integrally formed, they need to be stacked, which takes up thickness).

[0035] like Figure 2The connection part between the output shaft 3 and the connection block 11 is provided with a rotation-stopping structure 9 to prevent the output shaft 3 from rotating. For example, a non-circular groove is provided on the top surface of the output shaft 3, and a non-circular boss is provided on the bottom of the connection block 11. The non-circular boss is inserted into the non-circular groove to prevent the output shaft 3 from rotating, so as to prevent the output shaft 3 from rotating during the movement, so as to prevent the connection bolt from being easily broken by shear force.

[0036] As described above, the embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in the field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents. These modifications or replacements do not make the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the utility model. Therefore, all other embodiments obtained by ordinary technicians in the field without making creative work belong to the protection scope of the utility model.

Claims

1. A pressure mechanism, Features: It includes a support, a power element, an output shaft and a connecting rod assembly. The power element includes a retractable push rod. The connecting rod assembly includes a power arm and an actuator arm. The power arm is respectively hinged to the support, the push rod and the actuator arm through a first hinge point, a second hinge point and a third hinge point. The line connecting the first hinge point and the second hinge point is perpendicular to the line connecting the first hinge point and the third hinge point. The first hinge point is located on the extension line of the axis of the output shaft. When the pressure mechanism is in a reset state, the push rod and the output shaft are parallel. The power element drives the power arm to rotate through the extension and retraction of the push rod. The power arm drives the output shaft to reciprocate linearly through the actuator arm.

2. The pressure mechanism according to claim 1, Features: The power arm includes a first rod and a second rod connected vertically to each other, the length of the first rod is greater than that of the second rod, the first rod is hinged to the push rod, and the second rod is hinged to the actuator arm. The support is provided with a first limit block and a second limit block. When the first rod rotates to contact the first limit block, the output stroke of the output shaft is limited, and when the second rod rotates to contact the second limit block, the return stroke of the output shaft is limited.

3. The pressure mechanism according to claim 2, Features: The first limiting block and the second limiting block are elastic limiting blocks.

4. The pressure mechanism according to claim 2, Features: The first limiting block and the second limiting block are both detachably connected to the support.

5. The pressure mechanism according to claim 1, Features: The power arm includes a first rod and a second rod connected vertically to each other, the first rod and the second rod form an L shape, the junction of the first rod and the second rod is hinged to the support through a first rotating shaft to form a first hinge point, the first rod away from the second rod end is hinged to the push rod through a second rotating shaft to form a second hinge point, the second rod away from the first rod end is hinged to the actuator arm through a third rotating shaft to form a third hinge point, the output shaft is fixedly connected to a connecting block near one end of the actuator arm, the lower end of the actuator arm is hinged to the connecting block through a fourth rotating shaft, and the axis of the fourth rotating shaft is located on the axis of the output shaft.

6. The pressure mechanism according to claim 5, Features: The first rotating shaft, the second rotating shaft, the third rotating shaft and the fourth rotating shaft are all connected to other components through oil-free bushings, and the output shaft is connected to the support through oil-free bushings.

7. The pressure mechanism according to claim 5, Features: The support includes a main body seat, two opposite side plates, and a connecting plate. The main body seat is located below the connecting plate. The connecting plate connects the upper ends of the two side plates. The lower parts of the two side plates are fixedly connected to the opposite sides of the main body seat respectively. The main body seat is provided with a vertical guide hole. The output shaft performs reciprocating linear motion in the vertical guide hole. The power element is hinged on one side of the main body seat. The connecting rod assembly is located above the power element and the output shaft and between the main body seat and the connecting plate. The two ends of the first rotating shaft are connected to the two side plates.

8. The pressure mechanism according to claim 7, Features: The support also includes a power source seat, which is fixed on one side of the main body seat. The power element also includes a cylinder body. The push rod is retractable relative to the cylinder body. The cylinder body is hinged on the power source seat. When the pressure mechanism is in a reset state, the cylinder body is parallel to the output shaft.

9. The pressure mechanism according to claim 2 or 5, Features: The first rod member and the second rod member are integrally formed.

10. The pressure mechanism according to claim 5, Features: A rotation-stopping structure for preventing the output shaft from rotating is provided at a connection portion between the output shaft and the connection block.

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