A device for automatic cyclic step pressing

Abstract

This invention relates to the field of pressing equipment technology, and discloses an automatic cyclic step-by-step pressing device. The device includes a C-shaped support, a main cylinder, a pressing upper mold, a push rod cylinder, a one-way pushing module, a product loading fixture, and a worktable base plate. The push rod cylinder drives the one-way pushing module to move the product loading fixture forward through each station; a cycle time relay alternately controls the push rod cylinder and the main cylinder to work in a sequence of stepping followed by pressing; a proximity switch senses when the product loading fixture is in place or leaves, achieving automatic start and stop.

Description

Technical Field

[0001] This invention relates to the field of pressing equipment technology, and more specifically, to an automatic cyclic step pressing device. Background Technology

[0002] In the field of product pressing operations, general-purpose pneumatic presses are widely used to apply pressing force to products. Existing general-purpose pneumatic presses employ a single cylinder with a single-delay operation. After each pressing action, the operator must manually move the workpiece to the next station and press the button again to restart the cylinder before the next pressing can be performed. When a product loading fixture carries multiple products to be pressed, the operator must repeatedly perform manual movement and button-start operations. This working method results in low production efficiency and high labor intensity for operators due to repetitive actions. Summary of the Invention

[0003] This invention provides an automatic cyclic step-pressing device that solves the technical problems of uneven stepping of product loading fixtures and low pressing efficiency in related technologies.

[0004] This invention discloses an automatic cyclic step-by-step pressing device, comprising a C-shaped bracket, a worktable base plate, a main cylinder, a pressing upper mold, a push rod cylinder, a one-way pushing module, and a product loading fixture. The C-shaped bracket has a vertical column section and an upper crossbeam and a base section extending from the vertical column section. The upper crossbeam and the base section extend to the same side to form a C-shaped opening. The worktable base plate is fixedly connected to the base section. The main cylinder body is fixedly installed on the upper crossbeam, and the piston rod reciprocates vertically. The pressing upper mold is fixedly connected to the end of the main cylinder piston rod. The push rod cylinder body is fixedly installed on the worktable base plate, and the piston rod reciprocates horizontally. The one-way pushing module is fixedly connected to the end of the push rod cylinder piston rod. The product loading fixture 7 rests on the worktable base plate and slides along the step-by-step direction. Multiple product positioning stations are arranged at equal intervals along the step-by-step direction on its bearing surface, and multiple step grids are equally spaced on its side along the step-by-step direction. The unidirectional push module includes a pusher body and a pivot block. The pivot block is hinged to the pusher body by a pin and extends into the step grid under its own weight. When the piston rod of the pusher cylinder extends, the pivot block pushes the product loading fixture forward by one station spacing. When the piston rod of the pusher cylinder retracts, the pivot block crosses the partition and falls into the next step grid.

[0005] Furthermore, the step grid is a slot that runs vertically through the side of the product loading fixture, and the spacing between adjacent step grids is equal to the spacing between adjacent product positioning stations.

[0006] Furthermore, the pivoting block swings around the pin shaft in the vertical plane; when the piston rod of the pusher cylinder retracts, the pivoting block's input end is pushed upward around the pin shaft by the partition wall between adjacent step grids, and after passing the top of the partition wall, it swings downward around the pin shaft and falls back down under its own weight, with the input end falling into the next step grid.

[0007] Furthermore, a guide groove is provided on the bearing surface of the workbench base plate along the stepping direction, and a guide protrusion is provided on the bottom surface of the product loading fixture to cooperate with the guide groove. The guide protrusion is embedded in the guide groove and slides along the stepping direction.

[0008] Furthermore, a guide rail is provided on the bearing surface of the workbench base plate along the stepping direction, and a sliding groove is provided on the bottom surface of the product loading fixture to slide with the guide rail. The sliding groove is fitted on the outside of the guide rail and slides along the stepping direction.

[0009] Furthermore, it also includes a proximity switch and a cyclic time relay. The proximity switch is fixedly installed on the workbench base plate, with its sensing area aligned with the travel path of the product loading fixture; the power supply terminal of the cyclic time relay is electrically connected to the output terminal of the proximity switch. The cyclic time relay has an alternating first delay period and a second delay period, and is equipped with normally closed contacts and normally open contacts; during the first delay period, the normally closed contact is closed and the normally open contact is open, and during the second delay period, the normally closed contact is open and the normally open contact is closed; when the product loading fixture leaves the sensing area of ​​the proximity switch, the proximity switch is deactivated, and the cyclic time relay is de-energized and reset.

[0010] Furthermore, it also includes a first solenoid valve and a second solenoid valve. The control terminal of the first solenoid valve is electrically connected to the normally closed contact of the cycle time relay. The air port of the first solenoid valve is connected to the air source and the cylinder body of the push rod cylinder. When the normally closed contact is closed, the first solenoid valve is energized and reverses direction, causing the piston rod of the push rod cylinder to extend. When the normally closed contact is open, the first solenoid valve is de-energized and resets, causing the piston rod of the push rod cylinder to retract. The control terminal of the second solenoid valve is electrically connected to the normally open contact of the cycle time relay. The air port of the second solenoid valve is connected to the air source and the cylinder body of the main cylinder. When the normally open contact is closed, the second solenoid valve is energized and reverses direction, causing the piston rod of the main cylinder to extend. When the normally open contact is open, the second solenoid valve is de-energized and resets, causing the piston rod of the main cylinder to retract.

[0011] Furthermore, it also includes a dual air source assembly, which is fixedly installed on the side of the C-shaped bracket. The air inlet end of the dual air source assembly is connected to an external air source, and the air outlet end of the dual air source assembly is connected to the air inlet ports of the first solenoid valve and the second solenoid valve respectively through air pipelines.

[0012] Furthermore, it also includes a control box, which is fixedly connected to the C-shaped bracket. The control box panel is equipped with a power switch and a manual / automatic switch. The power switch controls the on / off of the power supply to the whole machine, and the manual / automatic switch switches between manual and automatic modes. In automatic mode, after the proximity switch senses the product loading fixture, the cycle time relay alternately controls the push rod cylinder and the main cylinder to perform cyclic step-by-step pressing.

[0013] Furthermore, a counter is installed on the control box panel. The counter is electrically connected to the normally open contact of the cycle time relay. The counter value increases once every time the main cylinder completes a pressing action.

[0014] This invention utilizes a pusher cylinder to drive a unidirectional pushing module, sequentially moving the product loading fixture. This replaces manual repositioning with automatic step-by-step repositioning, eliminating the need for operators to manually move workpieces after each pressing cycle, reducing repetitive operations and lowering operator workload. The invention employs a dual-delay alternating output of a cyclic time relay to control the pusher cylinder and main cylinder to work alternately in a step-by-step sequence followed by pressing. Operators only need to place the product loading fixture once to complete the continuous pressing of all products on the entire product loading fixture, eliminating the need for repeated button presses and improving the efficiency of continuous pressing operations. Furthermore, this invention uses a proximity switch to sense the arrival and departure of the product loading fixture. Once the product loading fixture has completely moved out of the sensing area, the power supply to the cyclic time relay is automatically cut off, causing the device to automatically stop and reset. This avoids idle travel and solves the technical problem in existing technologies where automatic cyclic step-by-step pressing cannot be performed after a single start. Attached Figure Description

[0015] Figure 1 This is a front view structural diagram of an embodiment of the present invention; Figure 2 This is a schematic diagram of the isometric structure according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the left-side structure according to an embodiment of the present invention; Figure 4 This is a top view structural diagram of an embodiment of the present invention.

[0016] In the diagram: C-shaped bracket-1; main cylinder-2; pressing upper mold-3; push rod cylinder-4; push claw body-5; pivot block-6; product loading fixture-7; workbench base plate-8; proximity switch-9; cycle time relay-10; control box-11; air source two-piece unit-12; power switch-13; manual / automatic switch-14; counter-15. Detailed Implementation

[0017] Example 1 In the field of product pressing operations, general-purpose pneumatic presses employ a single cylinder with a single-delay operation. After each pressing action is completed, the operator needs to manually move the workpiece to the next station and press the button again to start the cylinder for the next pressing operation. When multiple products to be pressed are loaded onto a single product loading fixture 7, the operator needs to repeatedly perform manual movement and button start operations, resulting in low production efficiency. Furthermore, the repetitive actions can easily lead to operator fatigue and high labor intensity. Therefore, a device is needed that can automatically complete step-by-step movement and cyclic pressing after a single start, reducing the frequency of manual intervention and improving the efficiency of continuous pressing operations.

[0018] like Figure 1-4 As shown in the embodiment, this embodiment provides an automatic cyclic step-by-step pressing device, which includes a C-shaped bracket 1, a main cylinder 2, a pressing upper mold 3, a push rod cylinder 4, a one-way pushing module, a product loading fixture 7, and a worktable base plate 8.

[0019] The C-shaped bracket 1 is an integral load-bearing frame, which has a vertical column section and an upper crossbeam and a base section extending from the vertical column section. The upper crossbeam and the base section extend horizontally to the same side, so that the C-shaped bracket 1 has a C-shaped opening on the side, and the C-shaped opening forms an operating space for the product loading fixture 7 to be sent in and taken out.

[0020] The workbench base plate 8 is fixedly connected to the base section of the C-shaped bracket 1. The bearing surface of the workbench base plate 8 extends horizontally to support the product loading fixture 7 and provide a sliding base for the product loading fixture 7.

[0021] The cylinder body of the main cylinder 2 is fixedly mounted on the upper crossbeam of the C-shaped bracket 1, and the piston rod of the main cylinder 2 reciprocates linearly in the vertical direction. The pressing upper mold 3 is fixedly connected to the end of the piston rod of the main cylinder 2 and moves vertically with the piston rod of the main cylinder 2. When the piston rod of the main cylinder 2 extends, the pressing upper mold 3 moves towards the worktable base plate 8, applying a pressing force to the product located above the worktable base plate 8.

[0022] The cylinder body of the push rod cylinder 4 is fixedly mounted on the worktable base plate 8. The piston rod of the push rod cylinder 4 reciprocates linearly in the horizontal direction, which is the jig's stepping direction. The unidirectional push module is fixedly connected to the end of the piston rod of the push rod cylinder 4 and moves along the jig's stepping direction with the piston rod of the push rod cylinder 4.

[0023] The product loading fixture 7 is a long, strip-shaped plate with multiple product positioning stations evenly spaced along the stepping direction on its bearing surface. These stations are used to hold multiple products to be pressed. Multiple stepping slots are evenly spaced along the side of the product loading fixture 7 along the stepping direction. Each stepping slot is a vertical slot penetrating the side of the product loading fixture 7. The spacing between adjacent stepping slots is equal to the spacing between adjacent product positioning stations, ensuring that the product loading fixture 7 advances exactly one station spacing for each push stroke completed by the unidirectional push module. The product loading fixture 7 rests on the bearing surface of the workbench base plate 8 and can slide freely along the fixture's stepping direction.

[0024] The unidirectional pushing module is a unidirectional pusher structure, comprising a pusher body 55 and a pivoting block 6. The pusher body 5 is fixedly connected to the end of the piston rod of the pusher cylinder 4. The pivoting block 6 is hinged to the pusher body 5 via a pin, and the pivoting block 6 can swing around the pin in a vertical plane. Under its own weight, the pivoting block 6's push-in end naturally hangs down and extends into the stepping grid of the product loading fixture 7. When the piston rod of the pusher cylinder 4 extends in the stepping direction, the push-in end of the pivoting block 6 abuts against the groove wall of the stepping grid, pushing the product loading fixture 7 to move one workstation distance in the stepping direction. When the piston rod of the pusher cylinder 4 retracts in the opposite direction of the stepping direction, the push-in end of the pivoting block 6 is pushed upward around the pin by the partition wall between adjacent stepping grids, and after passing the partition wall, it falls back down under its own weight, and the push-in end falls into the next stepping grid, thus realizing the unidirectional pushing function.

[0025] It should be understood that the product loading fixture 7 rests on the worktable base plate 8, located directly below the pressing upper mold 3. The pushing stroke direction of the push rod cylinder 4 is consistent with the stepping direction of the product loading fixture 7, enabling the pushing action of the unidirectional push module to drive the product loading fixture 7 to perform intermittent stepping linear motion along the stepping direction. The vertical movement trajectory of the pressing upper mold 3 is aligned with each product positioning station on the product loading fixture 7, so that after each stepping to the desired position, the pressing upper mold 3 can accurately press the product at the corresponding station.

[0026] In some embodiments, a guide groove is provided on the bearing surface of the workbench base plate 8 along the stepping direction, and a guide protrusion that mates with the guide groove is provided on the bottom surface of the product loading fixture 7. The guide protrusion is embedded in the guide groove and slides along the stepping direction, forming a constraint in the horizontal direction perpendicular to the stepping direction to prevent the product loading fixture 7 from shifting laterally during the stepping process.

[0027] In some embodiments, a guide rail is provided on the bearing surface of the workbench base plate 8 along the stepping direction, and a corresponding groove is provided on the bottom surface of the product loading fixture 7 to slide and engage with the guide rail. The groove is sleeved outside the guide rail and slides along the stepping direction, guiding and limiting the stepping movement of the product loading fixture 7.

[0028] Furthermore, in order to achieve the functions of automatically triggering the cyclic pressing action after the product loading fixture 7 is in place and automatically stopping after the product loading fixture 7 leaves, this device also includes a proximity switch 9, a cycle time relay 10, a first solenoid valve and a second solenoid valve.

[0029] The proximity switch 9 is fixedly installed on the workbench base plate 8, and the sensing area of ​​the proximity switch 9 is aligned with the travel path of the product loading fixture 7. When the product loading fixture 7 is within the sensing area of ​​the proximity switch 9, the proximity switch 9 is turned on and outputs an electrical signal; when the product loading fixture 7 completely leaves the sensing area, the proximity switch 9 is turned off.

[0030] A cyclic time relay 10 is installed inside a control box 11, which is fixedly connected to a C-shaped bracket 1. The cyclic time relay 10 has a first delay period and a second delay period, and is equipped with normally closed and normally open contacts. The power supply terminal of the cyclic time relay 10 is electrically connected to the output terminal of the proximity switch 9. When the proximity switch 9 is turned on, the cyclic time relay 10 is energized and begins to operate: during the first delay period, the normally closed contact remains closed, and the normally open contact remains open; after the first delay period ends, the second delay period begins, the normally closed contact opens, and the normally open contact closes; after the second delay period ends, the first delay period begins again, and so on, alternating in a cycle.

[0031] The control terminal of the first solenoid valve is electrically connected to the normally closed contact of the cycle time relay 10. The air port of the first solenoid valve is connected to the air source assembly 12 and the cylinder body of the push rod cylinder 4 through air pipelines. When the normally closed contact is closed, the first solenoid valve is energized and reversed, supplying air to the push rod cylinder 4, and the piston rod of the push rod cylinder 4 extends to perform a pushing action; when the normally closed contact is open, the first solenoid valve is de-energized and resets, and the piston rod of the push rod cylinder 4 retracts.

[0032] The control terminal of the second solenoid valve is electrically connected to the normally open contact of the cycle time relay 10. The air port of the second solenoid valve is connected to the air source assembly 12 and the cylinder body of the main cylinder 2 via air pipelines. When the normally open contact is closed, the second solenoid valve is energized and reverses direction, supplying air to the main cylinder 2, and the piston rod of the main cylinder 2 extends to perform the pressing action; when the normally open contact is open, the second solenoid valve is de-energized and resets, and the piston rod of the main cylinder 2 retracts.

[0033] The air source dual unit 12 is fixedly installed on the side of the C-shaped bracket 1. The air inlet end of the air source dual unit 12 is connected to an external air source, and the air outlet end of the air source dual unit 12 is connected to the air inlet ports of the first solenoid valve and the second solenoid valve through air pipelines, respectively, to provide the first solenoid valve and the second solenoid valve with filtered and pressure-regulated compressed air.

[0034] It should be noted that the durations of the first and second delay periods of the cycle time relay 10 are adjustable. The duration of the first delay period should be sufficient to allow the push rod cylinder 4 to complete one full extension and retraction stroke. The duration of the second delay period should be sufficient to allow the main cylinder 2 to complete one full extension-pressing and retraction return stroke. By adjusting the durations of the two delay periods, the pressing process requirements of different products can be adapted.

[0035] Furthermore, to facilitate operators switching between working modes, a power switch 13 and a manual / automatic switch 14 are installed on the control box 11 panel. The power switch 13 is used to control the on / off state of the entire machine's power supply. The manual / automatic switch 14 is used to switch between manual and automatic modes. In manual mode, the operator triggers a pressing action once each time a button is pressed; in automatic mode, after the proximity switch 9 senses the product loading fixture 7, the cycle time relay 10 automatically and alternately controls the push rod cylinder 4 and the main cylinder 2 to perform cyclic step pressing.

[0036] Furthermore, to facilitate recording the number of pressing operations, a counter 15 is installed on the control box 11 panel. The counter 15 is electrically connected to the normally open contact of the cycle time relay 10. Each time the main cylinder 2 completes a pressing operation, the count value of the counter 15 increases by one, making it easier for operators to keep track of the pressing progress and production statistics.

[0037] The operator first connects the air source, allowing compressed air to be filtered and pressure-regulated by the air source assembly 12 before being supplied to the air circuit. Then, the operator closes the power switch 13 to connect the entire machine's circuit. The manual / automatic switch 14 is then switched to automatic mode.

[0038] The operator places multiple products to be pressed sequentially into the product positioning stations of the product loading fixture 7. Then, the product loading fixture 7 with the loaded products is placed into the bearing surface of the worktable base plate 8 from the C-shaped opening side of the C-shaped bracket 1, so that the first product positioning station of the product loading fixture 7 is aligned with the position directly below the pressing upper mold 3, and at the same time, the pivoting end of the one-way push module 6 is lowered into the first step grid of the product loading fixture 7.

[0039] Once the product loading fixture 7 is in place, the proximity switch 9 senses the product loading fixture 7 and activates, outputting an electrical signal to the cycle time relay 10. The cycle time relay 10 is energized and begins the first delay period. During the first delay period, the normally closed contact closes, the first solenoid valve is energized and reverses direction, the piston rod of the push rod cylinder 4 extends, and the pivoting block 6 of the one-way push module abuts against the wall of the stepping grid, pushing the product loading fixture 7 forward one station spacing along the stepping direction. After the first delay period ends, the normally closed contact opens, the first solenoid valve is de-energized and resets, the piston rod of the push rod cylinder 4 retracts, and the pivoting block 6, during its retraction, passes over the partition between adjacent stepping grids and falls back into the next stepping grid.

[0040] In some embodiments, the process of the pivoting block 6 passing over the partition is as follows: when the piston rod of the push rod cylinder 4 retracts, the pivoting end of the pivoting block 6 contacts the inclined surface or top of the partition along the retraction direction, and is lifted up around the pin axis by the pushing force of the partition. The pivoting end disengages from the current step and passes over the top of the partition. Then, under its own weight, it swings down around the pin axis and falls back down, and the pivoting end falls into the next step.

[0041] Then, the second delay period begins. The normally open contact closes, the second solenoid valve is energized and reversed, the piston rod of the main cylinder 2 extends, and the upper pressing mold 3 moves downward in the vertical direction, applying pressing force to the product at the current station to complete the pressing. After the second delay period ends, the normally open contact opens, the second solenoid valve is de-energized and resets, the piston rod of the main cylinder 2 retracts, and the upper pressing mold 3 resets.

[0042] After this, the cycle time relay 10 re-enters the first delay period, and the push rod cylinder 4 pushes the product loading fixture 7 forward one station spacing again. Then, the main cylinder 2 performs the pressing again. This alternating cycle continues, with the product loading fixture 7 advancing gradually, and the products at each station being pressed in sequence.

[0043] After all product positioning stations on the product loading fixture 7 have completed pressing, the product loading fixture 7 completely leaves the sensing area of ​​the proximity switch 9 after the last step push. The proximity switch 9 is disconnected, the cycle time relay 10 is de-energized and reset, the first solenoid valve and the second solenoid valve are both de-energized and reset, the push rod cylinder 4 and the main cylinder 2 both stop operating, and the entire cycle step pressing process is automatically terminated.

[0044] The operator removes the product loading fixture 7 that has been pressed, reloads the product to be pressed, and places it back onto the worktable base plate 8 to start the next cycle of automatic step-by-step pressing operation.

[0045] This embodiment adds a pusher cylinder 4, a one-way pushing module, and a corresponding product loading fixture 7 to a general-purpose pneumatic press, forming a stepping feeding structure. The pusher cylinder 4 drives the one-way pushing module to enter the stepping grid of the product loading fixture 7. Each push causes the product loading fixture 7 to advance one workstation distance, thereby replacing manual repositioning with automatic stepping repositioning driven by the pusher cylinder 4. Therefore, operators do not need to manually move the workpiece position after each pressing, reducing repetitive operations.

[0046] This embodiment uses the dual-delay alternating output of the cyclic time relay 10 to control the push rod cylinder 4 and the main cylinder 2 to work alternately in a step-first, then pressing sequence, achieving automatic cycling after a single start. During the duration that the proximity switch 9 senses the product loading fixture 7, the push rod cylinder 4 and the main cylinder 2 continuously alternate until the product loading fixture 7 is completely removed from the sensing area and then automatically stops. Therefore, the operator only needs to place the product loading fixture 7 once to complete the continuous pressing of all products on the entire plate of product loading fixture 7, eliminating the need for repeated button presses and thus improving the efficiency of continuous pressing operations.

[0047] Furthermore, the unidirectional push module adopts a pivot block 6 structure, utilizing the weight of the pivot block 6 to achieve unidirectional push-in and reverse overtaking functions, completing the step-by-step switching of the step grid without the need for an additional power source or complex transmission structure. The proximity switch 9 serves as the start / stop signal source, automatically cutting off the power supply to the cycle time relay 10 after the product loading fixture 7 leaves, causing the entire device to automatically stop and reset, avoiding idle travel. Therefore, this device achieves automatic cyclic stepping pressing function with a simple structure, reducing the labor intensity of operators.

[0048] Example 2 According to an embodiment of this invention, based on Embodiment 1, an automatic cyclic step-by-step pressing device is provided, which is used to apply a constant pressing force to products at each station in the chip packaging pressing process of a precision ceramic substrate. It includes at least a C-shaped support 1, a main cylinder 2, a gas-liquid constant pressure module, a floating pressing assembly, and a cyclic control unit.

[0049] In some embodiments, a starting limit block is fixed at the starting end of the linear guide and a stopping limit block is fixed at the ending end of the stepping. The starting limit block and the stopping limit block respectively limit the extreme positions at both ends of the travel of the loading fixture along the stepping direction, preventing the loading fixture from detaching from the linear guide.

[0050] The main cylinder 2 is vertically fixed to the bottom surface of the crossbeam on the C-shaped bracket 1. The cylinder shaft of the main cylinder 2 is arranged vertically and located directly above the pressing station. The piston rod of the main cylinder 2 extends downward vertically to drive the gas-liquid constant pressure module and the floating pressing assembly to descend rapidly to a preset height close to the top surface of the product before stopping.

[0051] The gas-hydraulic constant pressure module is installed at the lower end of the piston rod of the main cylinder 2 and moves synchronously with the piston rod in the vertical direction. The gas-hydraulic constant pressure module includes at least one vertically arranged sealed cylinder and one isolation piston. The inner cavity of the sealed cylinder is divided into two independent enclosed spaces by the isolation piston: an air chamber located in the upper part of the inner cavity and a hydraulic chamber located in the lower part of the inner cavity. The outer circumference of the isolation piston is sealed to the inner wall of the sealed cylinder, and the isolation piston can slide vertically up and down within the inner cavity of the sealed cylinder. A gas pressure port is located at the top of the sealed cylinder, connecting to the air chamber. A hydraulic output port is located at the bottom of the sealed cylinder, connecting to the hydraulic chamber. The hydraulic chamber is filled with a sealed, incompressible liquid.

[0052] The air pressure interface is connected to the output end of the precision pressure reducing valve via a flexible air tube. The input end of the precision pressure reducing valve is connected to the factory air source, and the precision pressure reducing valve is fixedly mounted on the C-shaped bracket 1. The precision pressure reducing valve adjusts the factory air source to a set constant output pressure. The constant output pressure value is predetermined according to the required pressure and remains unchanged during operation. The flexible air tube accommodates the relative displacement between the output end of the precision pressure reducing valve and the air pressure interface that moves with the piston rod of the main cylinder 2 due to the extension and retraction of the piston rod.

[0053] In some embodiments, the upper end of the sealing cylinder is provided with a flange, and the flange is connected to the lower end of the piston rod of the main cylinder 2 by a thread.

[0054] The floating pressing assembly is installed below the sealing cylinder and includes at least a connecting cylinder, a guide post, a floating pressure head, and a sealing piston. The connecting cylinder is a cylindrical shell with an open bottom, and its upper end is fixedly connected to the bottom end of the sealing cylinder. A guide post is installed vertically within the inner cavity of the connecting cylinder, with its upper end fixed to the top wall of the inner cavity and extending downwards vertically. A linear bearing sleeve is provided at the upper end of the floating pressure head, which is fitted onto the guide post, allowing the floating pressure head to slide vertically up and down along the guide post. The lower end of the floating pressure head extends beyond the bottom opening of the connecting cylinder, and its bottom surface is a flat pressing working surface, facing the product carried on the loading fixture.

[0055] In some embodiments, the upper end of the connecting cylinder and the bottom end of the sealing cylinder are connected as one unit by threads.

[0056] In some embodiments, two parallel guide posts are installed vertically within the inner cavity of the connecting cylinder. These two guide posts are symmetrically arranged along the width of the connecting cylinder, and their upper ends are fixed to the top wall of the inner cavity. Two linear bearing sleeves are correspondingly provided at the upper end of the floating pressure head, and these sleeves are respectively fitted onto the two guide posts. The two symmetrically arranged guide posts provide dual-point guiding constraints for the floating pressure head, improving its stability and anti-tilting capability when sliding vertically.

[0057] A vertically oriented hydraulic piston hole is located at the center of the top surface of the floating pressure head. This hydraulic piston hole is a cylindrical blind hole with its opening facing upwards and its bottom wall closed. A sealing piston is inserted into the hydraulic piston hole from the top surface of the floating pressure head. The outer circumference of the sealing piston is sealed to the inner wall of the hydraulic piston hole, and the bottom surface of the sealing piston abuts against the bottom wall of the hydraulic piston hole. A hydraulic interface is located at the top of the sealing piston. The sealing piston is fixed to the top wall of the connecting cylinder cavity. Under hydraulic pressure, the floating pressure head slides vertically relative to the sealing piston. The bottom wall of the hydraulic piston hole, bearing the hydraulic pressure, drives the entire floating pressure head downwards.

[0058] A hydraulic hose is vertically arranged inside the connecting cylinder. The upper end of the hydraulic hose is connected to the hydraulic output port at the bottom of the sealing cylinder via a sealing connector, and the lower end of the hydraulic hose is connected to the hydraulic interface at the top of the sealing piston via a sealing connector. The hydraulic hose transmits the liquid pressure in the hydraulic chamber of the sealing cylinder to the enclosed space between the top surface of the sealing piston and the bottom wall of the hydraulically stressed piston hole. The hydraulic hose has sufficient redundant length, and the redundant part naturally bends within the connecting cylinder to accommodate the vertical sliding stroke of the floating pressure head relative to the connecting cylinder without stretching or breaking.

[0059] When the precision pressure reducing valve fills the air chamber with the set pressure P 气 When the gas is in the chamber, a constant gas pressure acts on the top surface of the isolating piston, pushing it to slide vertically downwards, thus pressurizing the sealed liquid within the hydraulic chamber. According to Pascal's principle, the liquid pressure within the hydraulic chamber is equal to the gas pressure within the gas chamber, meaning the pressure within the hydraulic chamber is also P. 气 The hydraulic pressure inside the hydraulic chamber is transmitted through the hydraulic output port and hydraulic hose to the closed space between the top surface of the sealed piston and the bottom wall of the hydraulically stressed piston hole. The hydraulic pressure acts on the bottom wall of the hydraulically stressed piston hole, driving the floating pressure head to slide down along the guide post, contact the top surface of the product and apply a pressing force.

[0060] The pressure force F applied to the product by the floating pressure head 压合 The following relationship must be satisfied: F 压合 =P 气 ×A 密封 ; Among them, P 气 The constant output air pressure value set for the precision pressure reducing valve, A 密封 This is the effective pressure-bearing area of ​​the sealing piston. Due to P 气 The pressure is a constant value and does not change with the displacement of the isolation piston or floating head. The fluid in the hydraulic chamber is an incompressible medium that does not attenuate during pressure transmission; therefore, F... 压合 It is a constant value and is independent of the downward distance when the floating pressure head contacts the product.

[0061] It should be noted that when the effective pressure-bearing area A of the sealing piston...密封 The effective pressure-bearing area A of the isolation piston is greater than 隔离 At this time, the pressure output by the floating pressure head is greater than the thrust generated by the air pressure in the air chamber acting directly on the isolation piston, achieving a gas-liquid force amplification effect. By selecting different ratios of the isolation piston area to the sealing piston area, the force amplification ratio can be adjusted to adapt to different pressure requirements.

[0062] Furthermore, to limit the travel range of the floating pressure head along the guide post and prevent it from detaching from the guide post, an annular groove is provided at the lower end of the guide post, and a retaining ring is embedded in the groove. The retaining ring is located below the linear bearing sleeve of the floating pressure head, serving as the ultimate stop for the floating pressure head's downward sliding. The lower surface of the top wall of the connecting cylinder serves as the ultimate contact surface for the floating pressure head's upward movement. When the air chamber is vented and depressurized, the pressure in the hydraulic chamber is released, and the floating pressure head is no longer subjected to downward hydraulic thrust. Under its own weight, the floating pressure head falls back along the guide post to the initial position defined by the retaining ring.

[0063] The device in Embodiment 2 also includes a cycle control unit, which coordinates the timing of the actions of the main cylinder 2, the push rod cylinder 4 and the precision pressure reducing valve to achieve automatic cycles of stepping, rapid descent, inflation and pressurization, pressure holding, exhaust and depressurization and return to position, and includes the cycle time relay 10 of Embodiment 1.

[0064] The apparatus in Example 2 performs the pressing operation cyclically according to the following steps during operation: After the loading fixture reaches its stepping position, the piston rod of the main cylinder 2 extends downward, driving the pneumatic-hydraulic constant pressure module and the floating pressing assembly to descend rapidly until the bottom surface of the floating pressure head is approximately 2mm from the top surface of the product. A preset gap ensures that the floating pressure head does not contact the product during the rapid descent, preventing impact.

[0065] After the main cylinder 2 stops, the precision pressure reducing valve fills the air chamber of the sealed cylinder with gas at a set pressure. The constant gas pressure in the air chamber acts on the top surface of the isolating piston, pushing the isolating piston downwards and pressurizing the sealed liquid in the hydraulic chamber. The hydraulic pressure in the hydraulic chamber is transmitted through the hydraulic hose to the closed space between the top surface of the sealed piston and the bottom wall of the hydraulically stressed piston hole. The hydraulic pressure acts on the bottom wall of the hydraulically stressed piston hole, driving the floating pressure head to slide downwards along the guide post. After the pressing working surface of the floating pressure head contacts the top surface of the product, it applies a constant pressing force to the product. Because the air chamber pressure is constant and the pressure transmitted by the liquid does not decrease, the applied pressing force is a constant value no matter how far the floating pressure head descends to contact the product.

[0066] After the floating pressure head applies pressure to the product, it keeps the air chamber pressure constant and maintains a constant pressure on the product. The pressure is held for a set time to complete the bonding process between the chip and the substrate.

[0067] After the pressure holding time ends, the air chamber is vented and depressurized through the air pressure port, and the gas pressure in the air chamber drops to zero. The pressure in the hydraulic chamber is then released, and the floating pressure head is no longer subjected to downward hydraulic thrust. Under its own weight, the floating pressure head falls back to the initial position defined by the snap ring along the guide post.

[0068] The piston rod of the main cylinder 2 retracts, causing the gas-liquid constant pressure module and the floating pressing assembly to return to their initial height.

[0069] This completes the pressing cycle for one station. The push rod cylinder 4 extends again, pushing the loading fixture to the next station, and repeats the pressing process until all products at all stations on the loading fixture have been pressed.

[0070] A pneumatic-hydraulic constant pressure module replaces the spring as the source of the clamping force. The precision pressure reducing valve outputs a constant air pressure value, which remains unchanged regardless of the displacement of the isolation piston or floating pressure head. The enclosed liquid within the hydraulic chamber is an incompressible medium, exhibiting no attenuation during pressure transmission. Therefore, the clamping force applied to the product by the floating pressure head is determined solely by the air pressure set by the precision pressure reducing valve and the pressure-bearing area of ​​the sealing piston, and is independent of the actual downward distance of the floating pressure head when it contacts the product. When the downward distance of the floating pressure head varies among products at different stations on the same fixture due to height differences, the clamping force experienced by each product remains consistent. This eliminates the problem of clamping force variation with compression caused by the linear mechanical characteristics of springs, meeting the stringent requirements for clamping force deviation in precision chip packaging.

[0071] The embodiments of the present invention have been described above. However, the embodiments are not limited to the specific implementation methods described above. The specific implementation methods described above are merely illustrative and not restrictive. Those skilled in the art can make more equivalent embodiments under the guidance of the present embodiments, and all of them are within the protection scope of the present embodiments.

Claims

1. An automatic cyclic step-pressing device, characterized in that, include: The C-shaped bracket has a vertical column section and an upper crossbeam and a base section extending from the vertical column section. The upper crossbeam and the base section extend to the same side to form a C-shaped opening. The workbench base plate is fixedly connected to the base section; The main cylinder has its cylinder body fixedly mounted on the upper crossbeam, and its piston rod reciprocates in the vertical direction. The upper mold is pressed and fixedly connected to the end of the piston rod of the main cylinder; The push rod cylinder has its cylinder body fixedly mounted on the bottom plate of the worktable, and the piston rod reciprocates horizontally. A one-way push module is fixedly connected to the end of the piston rod of the push rod cylinder; The product loading fixture is placed on the workbench base plate and slides along the stepping direction. Multiple product positioning stations are arranged at equal intervals along the stepping direction on its bearing surface, and multiple stepping grids are opened at equal intervals along its side along the stepping direction. The unidirectional push module includes a pusher body and a pivot block. The pivot block is hinged to the pusher body by a pin and extends into the step grid under its own weight. When the piston rod of the pusher cylinder extends, the pivot block pushes the product loading fixture forward by one station spacing. When the piston rod of the pusher cylinder retracts, the pivot block crosses the partition and falls into the next step grid.

2. The automatic cyclic step pressing device according to claim 1, characterized in that, The step grid is a slot that runs vertically through the side of the product loading fixture, and the spacing between adjacent step grids is equal to the spacing between adjacent product positioning stations.

3. The automatic cyclic step-pressing device according to claim 1, characterized in that, The pivoting block swings around the pin shaft in the vertical plane; when the piston rod of the pusher cylinder retracts, the pivoting block's input end is pushed upward around the pin shaft by the partition wall between adjacent step grids, and after passing the top of the partition wall, it swings downward around the pin shaft and falls back down under its own weight, with the input end falling into the next step grid.

4. The automatic cyclic step-pressing device according to claim 1, characterized in that, The workbench base plate has a guide groove on its bearing surface along the stepping direction. The bottom surface of the product loading fixture has a guide protrusion that mates with the guide groove. The guide protrusion is embedded in the guide groove and slides along the stepping direction.

5. The automatic cyclic step pressing device according to claim 1, characterized in that, The workbench base plate has a guide rail on its bearing surface along the stepping direction. The bottom surface of the product loading fixture has a sliding groove that slides with the guide rail. The sliding groove is fitted around the guide rail and slides along the stepping direction.

6. The automatic cyclic step pressing device according to claim 1, characterized in that, It also includes a proximity switch and a cyclic time relay; the proximity switch is fixedly installed on the workbench base plate, and the sensing area is aligned with the travel path of the product loading fixture; the power supply terminal of the cyclic time relay is electrically connected to the output terminal of the proximity switch, and the cyclic time relay has an alternating first delay period and a second delay period, and is provided with normally closed contacts and normally open contacts; during the first delay period, the normally closed contacts are closed and the normally open contacts are open, and during the second delay period, the normally closed contacts are open and the normally open contacts are closed; When the product loading fixture leaves the sensing area of ​​the proximity switch, the proximity switch disconnects, and the cycle time relay is de-energized and resets.

7. The automatic cyclic step pressing device according to claim 6, characterized in that, It also includes a first solenoid valve and a second solenoid valve; the control terminal of the first solenoid valve is electrically connected to the normally closed contact of the cycle time relay, and the air port of the first solenoid valve is connected to the air source and the cylinder body of the push rod cylinder. When the normally closed contact is closed, the first solenoid valve is energized and reverses to extend the piston rod of the push rod cylinder. When the normally closed contact is open, the first solenoid valve is de-energized and resets to retract the piston rod of the push rod cylinder. The control terminal of the second solenoid valve is electrically connected to the normally open contact of the cycle time relay, and the air port of the second solenoid valve is connected to the air source and the cylinder body of the main cylinder. When the normally open contact is closed, the second solenoid valve is energized and reverses to extend the piston rod of the main cylinder. When the normally open contact is open, the second solenoid valve is de-energized and resets to retract the piston rod of the main cylinder.

8. The automatic cyclic step pressing device according to claim 7, characterized in that, It also includes a dual air source unit, which is fixedly installed on the side of the C-shaped bracket. The air inlet end of the dual air source unit is connected to an external air source, and the air outlet end of the dual air source unit is connected to the air inlet ports of the first solenoid valve and the second solenoid valve through air pipelines, respectively.

9. The automatic cyclic step pressing device according to claim 6, characterized in that, It also includes a control box, which is fixedly connected to a C-shaped bracket; the control box panel is equipped with a power switch and a manual / automatic switch. The power switch controls the on / off of the power supply of the whole machine, and the manual / automatic switch switches between manual mode and automatic mode; in automatic mode, after the proximity switch senses the product loading fixture, the cycle time relay alternately controls the push rod cylinder and the main cylinder to perform cyclic step-by-step pressing.

10. The automatic cyclic step pressing device according to claim 9, characterized in that, A counter is installed on the control box panel. The counter is electrically connected to the normally open contact of the cycle time relay. The counter value increases once every time the main cylinder completes a pressing action.

Images