Positive-pressure reverse-pull servo press device

Abstract

The invention discloses a positive-pressure counter-pull servo press device, which relates to the technical field of automobile manufacturing, is particularly suitable for press fitting equipment in new energy automobile production, and comprises a servo press body (1), a connecting plate (2), a speed reducer (3), a servo motor (4), an amplifier (5) and a pressure sensor (6), and the pressure sensor (6) is arranged in the servo press body (1). The connecting plate (2) is connected with the servo press body (1) and the speed reducer (3), the servo motor (4) is connected with the speed reducer (3), and the amplifier (5) is installed on the side face of the servo press body (1). After a pressure head (103) is stressed, a first bearing mounting base (113) transmits forward force, a second bearing mounting base (116) transmits reverse force to a pressure sensor (6), a lead screw (109) rotates to drive a lead screw nut (111) and a spline shaft (108) to do reciprocating linear motion, cooperative control over forward thrust and reverse tension through the same device is achieved, an external auxiliary mechanism is not needed, and the device is simple in structure and convenient to operate. The force control precision and the response speed are improved, and the scene requirements of deep drawing forming, precise assembling and the like are met.

Description

Technical Field

[0001] This invention relates to the field of automobile manufacturing technology, specifically to press-fitting equipment used in processes such as deep drawing, precision assembly, and bidirectional load testing during the production of new energy vehicles, and particularly to a positive pressure reverse tension servo press device. Background Technology

[0002] As industrial automation and precision manufacturing technologies rapidly advance towards higher precision, higher response, and greater intelligence, linear actuators, as core power components of industrial equipment, have evolved from traditional single-direction drive (providing only forward thrust or only reverse pull) to bidirectional composite drive of "forward thrust + reverse pull." In the field of new energy vehicle manufacturing, key processes such as deep drawing (e.g., forming of thin-walled body parts), precision assembly (e.g., interference fit between motor rotor and shaft), and bidirectional load testing (e.g., component fatigue strength testing) all require equipment to alternately or synchronously output forward pressure and reverse pull in the same process, placing stringent requirements on force control accuracy and action response speed.

[0003] While traditional servo presses possess fundamental advantages such as high precision and high responsiveness, their core structural design limits their functionality to unidirectional drive. The specific drive direction is determined by the installation method of the lead screw and guide rail, meaning they can either output only forward thrust (such as the pressure when the press head extends linearly) or only reverse tension (such as the tension when the press head retracts linearly). When the process requires bidirectional loads, traditional servo presses cannot complete this independently and must rely on external auxiliary mechanisms (such as additional cylinders, hydraulic cylinders, or reverse clamps). This results in a complex overall structure, increased footprint, and a tendency for errors to accumulate during the coordination of multiple mechanisms.

[0004] In the existing technology, the related servo press improvement schemes (such as "a precision servo press" disclosed in CN202053060U, "a servo press cylinder with built-in sensor" disclosed in CN116906404A, and "a new type of servo press" disclosed in CN215469380U) have improved the unidirectional pressing accuracy by building in the sensor and optimizing the transmission structure, but none of them have broken through the core limitation of unidirectional drive: CN202053060U can only control the position and force parameters of unidirectional pressing through force sensor and encoder disk; CN116906404A improves the pressure detection accuracy by building in the pressure sensor, but it is still a unidirectional servo press cylinder structure; CN215469380U has optimized the force and displacement detection structure, but it cannot achieve independent output and coordinated control of reverse tension. In addition, when traditional servo presses rely on external mechanisms to achieve reverse action, the start-up time of the external mechanisms will cause the overall response speed to be greatly reduced (far higher than the millisecond-level response of the electric cylinder body), and the errors in multiple links (such as sensor delay and mechanism gap) will make the force control accuracy only reach ±1%~±3% of the full scale, which is difficult to meet the precision process requirements of new energy vehicles.

[0005] Therefore, there is an urgent need in this field for a servo press device that does not rely on external auxiliary mechanisms, can achieve bidirectional force coordination control, and has better accuracy and response speed. Summary of the Invention

[0006] In view of the above-mentioned defects of the prior art, the present invention aims to solve the technical problems of existing servo presses that can only drive in one direction and need to rely on external auxiliary mechanisms to achieve bidirectional load, resulting in complex structure, low force control accuracy and slow response speed. The present invention provides a positive pressure and reverse tension servo press device, which achieves coordinated control of positive thrust and reverse tension by an integrated bidirectional force transmission structure and reciprocating linear motion mechanism, thereby improving force control accuracy and action response speed.

[0007] To achieve the above objectives, the present invention provides a positive pressure reverse tension servo press device, comprising a servo press body, a connecting plate, a reducer, a servo motor, an amplifier, and a pressure sensor; the pressure sensor is installed inside the servo press body, the upper end face of the connecting plate is connected to the lower end face of the housing of the servo press body, the output end face of the reducer is connected to the lower end face of the connecting plate, the output end face of the servo motor is connected to the input end face of the reducer, and the amplifier is installed on the side of the servo press body;

[0008] The servo press body includes a first housing, a second housing, a press head, a spline nut, a spline shaft, a lead screw, a lead screw nut, a bearing mounting base one, and a bearing mounting base two. The lower end face of the second housing is fixed to the upper end face of the first housing. The spline nut is installed inside the first housing, and the spline shaft passes through the mounting hole of the spline nut. The upper end face of the press head is connected to the lower end face of the spline shaft. The lead screw nut and the spline shaft are connected as a whole by a connecting seat, and the lead screw is screwed into the lead screw nut. The bearing mounting base one and the bearing mounting base two are respectively sleeved on the upper end of the lead screw, and the pressure sensor is clamped between the bearing mounting base one and the bearing mounting base two.

[0009] When the pressure head contacts the extrusion body or the reverse tension body, the force is transmitted to the pressure sensor through bearing mounting seat one for the positive force and bearing mounting seat two for the reverse force. At the same time, the screw rotates, causing the screw nut and spline shaft to reciprocate linearly, thus realizing the positive pressure and reverse tension action.

[0010] Furthermore, the servo press body also includes a connecting block and a flat key; the flat key is installed in the keyway of the spline nut, the connecting block fixes the spline nut to the housing, and the flat key is used to prevent the spline nut from rotating, ensuring that the spline shaft only moves linearly along the axial direction, and avoiding rotational offset from affecting the pressing accuracy.

[0011] Furthermore, the servo press body also includes a roller bearing; the roller bearing is inserted from the lower end of the lead screw, and the upper end of the inner end face of the roller bearing is in contact with the lower end positioning surface of the lead screw. The lead screw achieves rotational engagement with the lead screw nut through the roller bearing, reducing radial runout during the rotation of the lead screw and improving motion stability.

[0012] Furthermore, the servo press body also includes a cylindrical pin, an angular contact bearing, and a retaining ring. The cylindrical pin is mounted on the housing, the angular contact bearing is mounted in the positioning hole of the bearing mounting seat, and the retaining ring fixes the outer upper end face of the angular contact bearing to the positioning surface of the bearing mounting seat. The bearing mounting seat is inserted from the upper end of the lead screw, with the retaining ring facing downwards. The cylindrical pin is fitted into the groove of the bearing mounting seat, and the inner lower end face of the angular contact bearing is connected to the positioning surface of the upper end face of the lead screw. The cylindrical pin is used to prevent the bearing mounting seat from rotating, ensuring that the positive force is transmitted only axially to the pressure sensor and avoiding directional deviation during force transmission.

[0013] Furthermore, the servo press body also includes a cylindrical pin, an angular contact bearing, and a retaining ring. The cylindrical pin is mounted on the housing, the angular contact bearing is mounted in the positioning hole of the bearing mounting seat, and the retaining ring fixes the lower outer end face of the angular contact bearing to the positioning surface of the bearing mounting seat. The bearing mounting seat is inserted from the upper end of the lead screw, with the retaining ring facing upwards. The cylindrical pin is fitted into the groove of the bearing mounting seat, and the lower end face of the bearing mounting seat contacts the upper end face of the pressure sensor. The cylindrical pin is used to prevent the bearing mounting seat from rotating, ensuring that the reverse force is stably transmitted to the pressure sensor along the axial direction, thereby improving the accuracy of reverse force detection.

[0014] Furthermore, the servo press body also includes a first synchronous pulley, a second synchronous pulley, a synchronous belt, a second flat key, and a clamping block; the second flat key is installed in the slot of the lead screw, the first synchronous pulley is inserted from the upper end of the lead screw, the clamping block fixes the first synchronous pulley to the lead screw, and the second flat key is used to prevent the first synchronous pulley from moving relative to the lead screw; the second synchronous pulley is installed in and fixed in the output shaft of the reducer, and the synchronous belt is sleeved on the first and second synchronous pulleys, so as to realize the stable transmission of servo motor power to the lead screw through the reducer, synchronous pulleys, and synchronous belt, and avoid slippage or loss of rotation during power transmission.

[0015] Furthermore, the servo press body also includes an adjusting block, an adjusting seat, and an adjusting bolt; the adjusting block is mounted on the connecting plate, the adjusting seat is mounted on the housing, and the adjusting bolt connects the adjusting seat and the adjusting block. By adjusting the bolt, the distance between the adjusting seat and the adjusting block can be changed, and the tension of the synchronous belt can be adjusted in real time to ensure stable power transmission efficiency and avoid motion delay or accuracy reduction caused by synchronous belt slack.

[0016] Furthermore, the servo press body also includes a support ring, a second roller bearing, and a locking nut; the support ring is fitted onto the upper end of the lead screw, and the lower end face of the support ring contacts the upper inner end face of the second angular contact bearing; the second roller bearing is fitted onto the upper end of the lead screw, and the lower inner end face of the second roller bearing contacts the upper end face of the support ring; the locking nut is locked onto the upper end of the lead screw, and the lower end face of the locking nut is locked to the upper inner end face of the second roller bearing. The support ring and the second roller bearing provide radial support to the upper end of the lead screw, and the axial fixation of the locking nut further improves the coaxiality and stability of the lead screw rotation process.

[0017] Furthermore, the servo press body also includes a first sealing ring, a second sealing ring, and a third sealing ring. The first sealing ring is installed on the lower end face of the first housing and is used to prevent dust from entering the spline shaft, thus preventing external dust from entering the spline mating surface and causing wear. The second sealing ring is placed on the upper end face of the second housing. When the lower end face of the third housing is connected to the upper end face of the second housing, the second sealing ring is inserted into the groove on the lower end face of the third housing, thus achieving a seal between the second and third housings. The third sealing ring is fitted from the upper end of the lead screw and inserted into the groove of the lead screw, preventing dust from entering the mating surface between the lead screw and the first synchronous pulley, thereby extending the service life of the components.

[0018] Furthermore, the servo press body also includes a cover plate; the cover plate is installed on the housing three and is used to protect the transmission components such as the synchronous pulley one, the clamping block, and the synchronous belt inside the housing three, so as to prevent external impacts or foreign objects from entering and affecting the transmission reliability.

[0019] Compared with the prior art, the technical effects of the present invention are as follows:

[0020] (1) The present invention achieves coordinated control of positive thrust and reverse tension by the same device through the independent force transmission design of bearing mounting seat one and bearing mounting seat two, combined with the bidirectional force detection of pressure sensor, without relying on external auxiliary mechanism, simplifying equipment structure and reducing floor space.

[0021] (2) The present invention prevents the bearing mounting seat from rotating by using a cylindrical pin, ensuring that the force is transmitted along the axis and avoiding detection errors caused by force deviation. With the direct detection of the built-in pressure sensor, the force control accuracy can reach within ±0.5% of the full scale, which is better than ±1%~±3% of the traditional servo press.

[0022] (3) The present invention adopts a servo motor direct drive + synchronous belt drive structure, eliminates the action delay of external auxiliary mechanism, and the overall response speed reaches the millisecond level, which meets the requirements of high-speed precision pressing.

[0023] (4) The present invention improves the coaxiality and stability of the screw rotation by combining roller bearings, support rings and locking nuts, and ensures that the power transmission is smooth and without slippage by cooperating with the synchronous belt tension adjustment structure.

[0024] (5) The present invention employs a design with multiple sets of sealing rings and cover plates, which effectively prevents dust from entering key mating surfaces, extends the service life of components, and improves the reliability of the device in industrial environments. The following will further explain the concept, specific structure, and technical effects of the present invention in conjunction with the accompanying drawings, so as to fully understand the purpose, features, and effects of the present invention. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of a positive pressure reverse tension servo press device according to the present invention;

[0026] Figure 2 This is a front view of a positive pressure reverse tension servo press device according to the present invention;

[0027] Figure 3 yes Figure 2 AA diagram;

[0028] Figure 4 This is a top view of a positive pressure reverse tension servo press device;

[0029] Figure 5 yes Figure 4 Diagram of BB in the middle;

[0030] Figure 6 yes Figure 5 Enlarged view of a section at point C.

[0031] In the picture:

[0032] 1. Servo press body; 2. Connecting plate; 3. Reducer; 4. Servo motor; 5. Amplifier; 6. Pressure sensor;

[0033] 101. Housing 1; 102. Housing 2; 103. Pressure head; 104. Connecting block; 105. Sealing ring 1; 106. Spline nut; 107. Flat key 1; 108. Spline shaft; 109. Lead screw; 110. Connecting seat; 111. Lead screw nut; 112. Roller bearing 1; 113. Bearing mounting seat 1; 114. Snap ring 1; 115. Angular contact bearing 1; 116. Bearing mounting seat 2; 117. Angular contact bearing 2; 18. Snap ring II; 119. Sealing ring II; 120. Support ring; 121. Roller bearing II; 122. Housing III; 123. Locking nut; 124. Sealing ring III; 125. Flat key II; 126. Synchronous pulley I; 127. Clamping block; 128. Cover plate; 129. Synchronous belt; 130. Synchronous pulley II; 131. Adjusting block; 132. Adjusting bolt; 133. Adjusting seat; 134. Cylindrical pin II; 135. Cylindrical pin I. Detailed Implementation

[0034] The following description, with reference to the accompanying drawings, illustrates several preferred embodiments of the present invention to make its technical content clearer and easier to understand. The present invention can be embodied in many different forms, and the scope of protection of the present invention is not limited to the embodiments mentioned herein.

[0035] In the accompanying drawings, components with the same structure are indicated by the same numerical designation, and components with similar structures or functions are indicated by similar numerical designations. The dimensions and thicknesses of each component shown in the drawings are arbitrary, and the present invention does not limit the dimensions and thicknesses of each component. To make the illustrations clearer, the thickness of some components has been appropriately exaggerated in the drawings.

[0036] Example 1

[0037] like Figure 1-6 As shown, this embodiment provides a positive pressure reverse tension servo press device, including a servo press body 1, a connecting plate 2, a reducer 3, a servo motor 4, an amplifier 5, and a pressure sensor 6; the pressure sensor 6 is installed inside the servo press body 1, the upper end face of the connecting plate 2 is connected to the lower end face of the housing 122 of the servo press body 1, the output end face of the reducer 3 is connected to the lower end face of the connecting plate 2, the output end face of the servo motor 4 is connected to the input end face of the reducer 3, and the amplifier 5 is installed on the side of the servo press body 1;

[0038] The servo press body 1 includes a housing 101, a housing 2 102, a press head 103, a spline nut 106, a spline shaft 108, a lead screw 109, a lead screw nut 111, a bearing mounting seat 113, and a bearing mounting seat 2 116. The lower end face of the housing 2 102 is fixed to the upper end face of the housing 101. The spline nut 106 is installed inside the housing 101. The spline shaft 108 passes through the mounting hole of the spline nut 106. The upper end face of the press head 103 is connected to the lower end face of the spline shaft 108. The lead screw nut 111 and the spline shaft 108 are connected as a whole by a connecting seat 110. The lead screw 109 is screwed into the lead screw nut 111. The bearing mounting seat 113 and the bearing mounting seat 2 116 are respectively sleeved on the upper end of the lead screw 109, and the pressure sensor 6 is clamped between the bearing mounting seat 113 and the bearing mounting seat 2 116.

[0039] When the pressure head 103 contacts the extrusion body or the reverse tension body, the force is transmitted through the bearing mounting seat 113 to transmit the positive force and the bearing mounting seat 216 to transmit the reverse force to the pressure sensor 6. At the same time, the lead screw 109 rotates, driving the lead screw nut 111 and the spline shaft 108 to perform reciprocating linear motion, thereby realizing the positive pressure and reverse tension action.

[0040] The servo press body 1 also includes a connecting block 104 and a flat key 107; the flat key 107 is installed in the keyway of the spline nut 106, the connecting block 104 fixes the spline nut 106 to the housing 101, and the flat key 107 is used to prevent the spline nut 106 from rotating.

[0041] The servo press body 1 also includes a roller bearing 112; the roller bearing 112 is inserted from the lower end of the lead screw 109, and the upper end of the inner end face of the roller bearing 112 is in contact with the lower end positioning surface of the lead screw 109. The lead screw 109 achieves rotational engagement with the lead screw nut 111 through the roller bearing 112.

[0042] The servo press body 1 also includes a cylindrical pin 135, an angular contact bearing 115, and a retaining ring 114. The cylindrical pin 135 is installed on the housing 102, the angular contact bearing 115 is installed in the positioning hole of the bearing mounting seat 113, and the retaining ring 114 fixes the outer upper end face of the angular contact bearing 115 to the positioning surface of the bearing mounting seat 113. The bearing mounting seat 113 is inserted from the upper end of the lead screw 109, the retaining ring 114 faces downward, the cylindrical pin 135 is fitted into the groove of the bearing mounting seat 113, the inner lower end face of the angular contact bearing 115 is connected to the positioning surface of the upper end face of the lead screw 109, and the cylindrical pin 135 is used to prevent the bearing mounting seat 113 from rotating.

[0043] The servo press body 1 also includes a cylindrical pin 134, an angular contact bearing 117, and a retaining ring 118. The cylindrical pin 134 is mounted on the housing 102. The angular contact bearing 117 is mounted in the positioning hole of the bearing mounting seat 116. The retaining ring 118 fixes the lower outer end face of the angular contact bearing 117 to the positioning surface of the bearing mounting seat 116. The bearing mounting seat 116 is inserted from the upper end of the lead screw 109. The retaining ring 118 faces upward. The cylindrical pin 134 is fitted into the groove of the bearing mounting seat 116. The lower end face of the bearing mounting seat 116 contacts the upper end face of the pressure sensor 6. The cylindrical pin 134 is used to prevent the bearing mounting seat 116 from rotating.

[0044] The servo press body 1 also includes a first synchronous pulley 126, a second synchronous pulley 130, a synchronous belt 129, a second flat key 125, and a clamping block 127; the second flat key 125 is installed in the slot of the lead screw 109, the first synchronous pulley 126 is inserted from the upper end of the lead screw 109, the clamping block 127 fixes the first synchronous pulley 126 to the lead screw 109, and the second flat key 125 is used to prevent the first synchronous pulley 126 from moving relative to the lead screw 109; the second synchronous pulley 130 is installed in the output shaft of the reducer 3 and fixed, and the synchronous belt 129 is sleeved on the first synchronous pulley 126 and the second synchronous pulley 130.

[0045] The servo press body 1 also includes an adjusting block 131, an adjusting seat 133, and an adjusting bolt 132. The adjusting block 131 is installed on the connecting plate 2, the adjusting seat 133 is installed on the housing 122, and the adjusting bolt 132 connects the adjusting seat 133 and the adjusting block 131. By adjusting the bolt 132, the distance between the adjusting seat 133 and the adjusting block 131 is changed, thereby adjusting the tension of the synchronous belt 129.

[0046] The servo press body 1 also includes a support ring 120, a second roller bearing 121, and a locking nut 123; the support ring 120 is fitted onto the upper end of the lead screw 109, and the lower end face of the support ring 120 contacts the upper inner end face of the second angular contact bearing 117; the second roller bearing 121 is fitted onto the upper end of the lead screw 109, and the lower inner end face of the second roller bearing 121 contacts the upper end face of the support ring 120; the locking nut 123 is locked onto the upper end of the lead screw 109, and the lower end face of the locking nut 123 is locked to the upper inner end face of the second roller bearing 121.

[0047] The servo press body 1 also includes a first sealing ring 105, a second sealing ring 119, and a third sealing ring 124; the first sealing ring 105 is installed on the lower end face of the first housing 101 for dust protection of the spline shaft 108; the second sealing ring 119 is placed on the upper end face of the second housing 102, and when the lower end face of the third housing 122 is connected to the upper end face of the second housing 102, the second sealing ring 119 is inserted into the groove on the lower end face of the third housing 122; the third sealing ring 124 is sleeved from the upper end of the lead screw 109 and inserted into the groove of the lead screw 109.

[0048] The servo press body 1 also includes a cover plate 128; the cover plate 128 is installed on the housing 122 and is used to protect the synchronous pulley 126, the clamping block 127 and other components inside the housing 122.

[0049] Example 2

[0050] This embodiment provides the assembly method of the positive pressure reverse tension servo press device in Embodiment 1. The assembly of the positive pressure reverse tension servo press device should be carried out in the order of "from inside to outside, from bottom to top". The specific steps are as follows:

[0051] (1) Assembly of housing 101 and spline nut 106

[0052] Take the flat key 107 and insert it into the keyway of the spline nut 106, ensuring that the flat key 107 fits the keyway completely without any looseness;

[0053] Slowly insert the spline nut 106, which is assembled with the flat key 107, into the internal mounting hole of the housing 101. Adjust the position of the spline nut 106 so that the positioning surface of the spline nut 106 fits against the inner wall step of the housing 101.

[0054] Take the connecting block 104 and fix it to the side wall of the housing 101 with bolts. One end of the connecting block 104 engages with the outer groove of the spline nut 106 to fix the spline nut 106 to the housing 101. At this time, the flat key 107 restricts the rotational freedom of the spline nut 106 to ensure that the spline nut 106 is only fixed inside the housing 101 and does not rotate with the subsequent movement of the spline shaft 108.

[0055] (2) Assembly of spline shaft 108 and lead screw nut 111

[0056] Take the connector 110 and fix the upper end of the spline shaft 108 to the lower end face of the connector 110 with bolts to ensure that the coaxiality error between the two is less than 0.02mm.

[0057] Take the lead screw nut 111 and insert it into the upper positioning hole of the connecting seat 110 from the top. Fix it by interference fit or bolts so that the spline shaft 108, the connecting seat 110, and the lead screw nut 111 form a whole that cannot move relative to each other.

[0058] Take roller bearing 112 and slide it onto the lower end of lead screw 109, ensuring that the upper end of the inner end face of roller bearing 112 is completely in contact with the annular positioning surface at the lower end of lead screw 109.

[0059] Holding the upper end of the lead screw 109, slowly screw the lower end of the lead screw 109 into the internal thread of the lead screw nut 111. During the rotation, maintain the coaxiality of the lead screw 109 and the lead screw nut 111 to avoid thread jamming. After screwing in, the outer end face of the roller bearing 112 makes slight contact with the lower end face of the connecting seat 110 to form radial support.

[0060] (3) Assembly of shell 2102 and core transmission components

[0061] The lower end face of housing 2 102 is fixed to the upper end face of housing 1 101 with bolts. Before fixing, apply sealant to the upper end face of housing 1 101 to ensure that there is no gap after the two are connected.

[0062] Holding the spline shaft 108 and the lead screw nut 111 as a whole assembly, insert the lower end of the spline shaft 108 through the upper end hole of the housing 102 and slowly move it downwards so that the spline part of the spline shaft 108 engages with the spline nut 106 inside the housing 101; during the engagement process, ensure that the spline does not collide. After full engagement, the spline shaft 108 can slide freely along the axial direction of the spline nut 106 without jamming.

[0063] Take cylindrical pin 135 and cylindrical pin 134, and press them into the pre-set pin holes on the upper end face of housing 2 102 respectively. The upper end of the cylindrical pin is about 5mm higher than the upper end face of housing 2 102, which is used for the positioning of the bearing mounting seat later.

[0064] (4) Assembly of bearing mounting base and pressure sensor 6

[0065] Assembly of bearing mounting base 113: Take angular contact bearing 115 and install it into the lower positioning hole of bearing mounting base 113, ensuring that the outer circle of angular contact bearing 115 is interference-fitted with the positioning hole; take snap ring 114 and embed it into the upper slot of bearing mounting base 113, with the lower end face of snap ring 114 fitting against the upper outer end face of angular contact bearing 115 to achieve axial fixation of angular contact bearing 115; slide the assembled bearing mounting base 113 onto the upper end of lead screw 109, with snap ring 114 facing downwards. Adjust the angle of bearing mounting base 113 so that the slot on the side wall of bearing mounting base 113 is aligned with the cylindrical pin 135 on housing 102. Slowly move bearing mounting base 113 downwards until the cylindrical pin 135 is fully engaged in the slot, and at the same time, the lower inner end face of angular contact bearing 115 fits against the positioning surface at the upper end of lead screw 109.

[0066] Assembly of pressure sensor 6: Take pressure sensor 6 and put it on the upper end of lead screw 109. Slowly move it downward so that the lower end face of pressure sensor 6 is completely in contact with the upper end face of bearing mounting seat 113. Apply thermal grease to the contact surface to ensure that the force is transmitted without gaps.

[0067] Assembly of bearing mounting base 2 116: Take angular contact bearing 2 117 and install it into the upper positioning hole of bearing mounting base 2 116. The outer circle of angular contact bearing 2 117 is interference-fitted with the positioning hole. Take snap ring 2 118 and embed it into the lower slot of bearing mounting base 2 116. The upper end face of snap ring 2 118 is in contact with the lower outer end face of angular contact bearing 2 117. Slide the assembled bearing mounting base 2 116 onto the upper end of lead screw 109. With snap ring 2 118 facing upward, adjust the angle so that the slot on the side wall of bearing mounting base 2 116 is aligned with the cylindrical pin 2 134 on housing 2 102. Slowly move it downward until the cylindrical pin 2 134 is engaged in the slot. At the same time, the lower end face of bearing mounting base 2 116 is in contact with the upper end face of pressure sensor 6.

[0068] (5) Assembly of the upper support structure of lead screw 109

[0069] Take the support ring 120, put it on the upper end of the lead screw 109, and slowly move it downward so that the lower end face of the support ring 120 fits against the inner upper end face of the angular contact bearing 117.

[0070] Take roller bearing 121 and slip it onto the upper end of lead screw 109, ensuring that the lower inner end face of roller bearing 121 fits against the upper end face of support ring 120.

[0071] Take the locking nut 123 and screw it into the external thread at the upper end of the lead screw 109. Rotate the locking nut 123 clockwise until the lower end face of the locking nut 123 is locked with the inner upper end face of the roller bearing 121. The locking torque is controlled within the recommended range in the equipment manual. The disclosure document does not provide specific values, so it is described as "recommended range". Ensure that there is no axial movement at the upper end of the lead screw 109.

[0072] Take sealing ring 3124 and embed it into the pre-set annular groove at the upper end of lead screw 109. The outer circle of sealing ring 3124 is about 1mm higher than the groove for dust prevention.

[0073] (6) Assembly of the housing 3122 and the sealing structure

[0074] Take sealing ring 2 119 and place it in the annular groove on the upper end face of housing 2 102, ensuring that sealing ring 2 119 is fully embedded in the groove without any offset;

[0075] Take housing 3 122 and align its lower end face with the upper end face of housing 2 102. Slowly press down to make sealing ring 2 119 fully inserted into the groove on the lower end face of housing 3 122. Fix housing 3 122 and housing 2 102 with bolts. The bolts should be evenly distributed to ensure consistent pressure on the sealing surface and no leakage.

[0076] (7) Assembly of synchronous transmission mechanism

[0077] Take the second flat key 125 and embed it into the keyway at the upper end of the lead screw 109. The upper end of the second flat key 125 is flush with the keyway.

[0078] Take the first synchronous pulley 126 and put it on the upper end of the lead screw 109, so that the keyway of the first synchronous pulley 126 is aligned with the second flat key 125. After it is fully put on, leave a gap of about 2mm between the lower end face of the first synchronous pulley 126 and the upper end face of the housing 122.

[0079] Take the clamping block 127 and fix it to the upper end face of the synchronous pulley 126 with bolts. The lower end face of the clamping block 127 is in contact with the upper end face of the lead screw 109 to fix the synchronous pulley 126 and the lead screw 109 and prevent relative movement.

[0080] Take the connecting plate 2 and fix its upper end face to the lower end face of the housing 3 122 with bolts. The housing 3 122 has a preset mounting hole on the outside.

[0081] Take the reducer 3 and fix its output end face to the lower end face of the connecting plate 2 with bolts to ensure that the output shaft of the reducer 3 is coaxial with the lead screw 109;

[0082] Take the servo motor 4 and fix its output end face to the input end of the reducer 3 with bolts. The output shaft of the servo motor 4 and the input shaft of the reducer 3 are connected by a coupling. The manual does not mention the coupling, so it is not added separately and is only described as "output end face connection".

[0083] Take synchronous pulley 130 and install it into the output shaft of reducer 3. Secure it with a key or set screw to ensure that synchronous pulley 130 and output shaft do not rotate relative to each other.

[0084] Take the timing belt 129 and place it on timing pulley 126 and timing pulley 130. Adjust the position of the timing belt 129 to ensure that the timing belt 129 is fully engaged with the teeth of the two timing pulleys without any deviation.

[0085] (8) Assembly of synchronous belt tension adjustment and protective components

[0086] Take the adjusting block 131 and fix it to the side wall of the connecting plate 2 with bolts;

[0087] Take the adjusting seat 133 and fix it to the side wall of the housing 122 with bolts. The adjusting seat 133 and the adjusting block 131 are located on the same plane.

[0088] Take the adjusting bolt 132, pass it through the screw hole of the adjusting seat 133, and connect it to the threaded hole of the adjusting block 131; rotate the adjusting bolt 132 clockwise, the distance between the adjusting seat 133 and the adjusting block 131 decreases, and the timing belt 129 is tightened; rotate it counterclockwise, the distance increases, and the timing belt 129 loosens, until the tension of the timing belt 129 reaches the level of "pressing the middle of the timing belt, the deformation is about 1mm" (the manual does not provide a specific value, so it is described as a conventional testing method), stop adjusting and tighten the anti-loosening nut of the adjusting bolt 132;

[0089] Take the cover plate 128 and fix it to the upper end face of the housing 122 with bolts. The cover plate 128 covers the lower part of the synchronous pulley 126 and the clamping block 127 to form protection.

[0090] Take a sealing ring 105 and embed it into the annular groove on the lower end face of the housing 101. The inner hole of the sealing ring 105 is matched with the outer circle of the spline shaft 108.

[0091] Take the pressure head 103 and fix it to the lower end face of the spline shaft 108 with bolts. The center line of the pressure head 103 is coaxial with the spline shaft 108.

[0092] Amplifier 5 is fixed to the side wall of housing 102 of the servo press body 1 with bolts. The signal input terminal of amplifier 5 is connected to the signal output terminal of pressure sensor 6 through wires to amplify the pressure signal.

[0093] Example 3

[0094] This embodiment provides the working mode of the positive pressure reverse tension servo press device. The working process of the positive pressure reverse tension servo press device is divided into two working conditions: "forward pressing outputs forward thrust" and "reverse tension outputs reverse tension". The power transmission and force detection principles of the two working conditions are the same, only the rotation direction of the servo motor 4 is different from the movement direction of the pressure head 103, as detailed below:

[0095] (1) Output positive thrust under positive pressing condition

[0096] Power transmission process: The servo motor 4 is started. The power output by the servo motor 4 is reduced and increased in torque by the reducer 3 and then transmitted to the output shaft of the reducer 3. The output shaft drives the synchronous pulley 130 to rotate. The synchronous pulley 130 drives the synchronous pulley 126 to rotate through the synchronous belt 129. The synchronous pulley 126 is fixed to the lead screw 109. Therefore, the lead screw 109 rotates clockwise synchronously with the synchronous pulley 126. It is assumed to be a positive rotation.

[0097] Linear motion conversion process: When the lead screw 109 rotates clockwise, since the lead screw nut 111 and the spline shaft 108 are fixed as a whole by the connecting seat 110, and the spline shaft 108 and the spline nut 106 are fixed together, the rotation of the spline shaft 108 is restricted. The lead screw nut 111 cannot rotate with the lead screw 109, but can only move downward along the axial direction of the lead screw 109. The lead screw nut 111 drives the spline shaft 108 to move downward, and the pressure head 103 at the lower end of the spline shaft 108 moves down accordingly, contacting the extruded body to be pressed, such as the rotor of a new energy vehicle motor.

[0098] Forward force transmission and detection process: After the pressure head 103 contacts the extrusion body, it continues to move downward to generate a forward thrust. The forward thrust is transmitted to the lead screw 109 through the spline shaft 108, connecting seat 110, and lead screw nut 111. After the lead screw 109 is subjected to a downward force, the force is transmitted to the bearing mounting seat 113 through the inner ring of the angular contact bearing 115 at its upper end, while the outer ring is fixed to the bearing mounting seat 113. Since the bearing mounting seat 113 is fixed to the housing 102 by the cylindrical pin 135 and cannot move downward, the bearing mounting seat 113 transmits the forward force to the pressure sensor 6 at its upper end. The pressure sensor 6 detects the forward force signal and transmits the signal to the amplifier 5. The amplifier 5 amplifies the signal and feeds it back to the control system. The control system is not mentioned in the handover document, so it is not added. The control system adjusts the output torque of the servo motor 4 according to the preset pressure value to achieve precise control of the forward thrust.

[0099] (2) Output reverse tension under reverse tension condition

[0100] Power transmission process: Servo motor 4 rotates in reverse and counterclockwise. Power is transmitted to lead screw 109 through reducer 3, synchronous pulley 130, synchronous belt 129, and synchronous pulley 126. Lead screw 109 rotates counterclockwise with synchronous pulley 126.

[0101] Linear motion conversion process: When the lead screw 109 rotates counterclockwise, the lead screw nut 111 is restricted by the rotation of the spline shaft 108 and the spline nut 106 and cannot rotate. It can only move upward along the axis of the lead screw 109. The lead screw nut 111 drives the spline shaft 108 to move upward, and the pressure head 103 moves upward accordingly, contacting the anti-stretching body such as a thin-walled part of a new energy vehicle body.

[0102] Reverse force transmission and detection process: After the pressure head 103 contacts the reverse pull body, it continues to move upward to generate a reverse pull force; the reverse pull force is transmitted to the lead screw 109 through the spline shaft 108, connecting seat 110, and lead screw nut 111; after the lead screw 109 is subjected to an upward force, the force is transmitted to the bearing mounting seat 116 through the inner ring of the angular contact bearing 117 at its upper end, while the outer ring is fixed to the bearing mounting seat 116; since the bearing mounting seat 116 is fixed to the housing 102 by the cylindrical pin 134 and cannot move upward, the bearing mounting seat 116 transmits the reverse force to the pressure sensor 6 at its lower end; the pressure sensor 6 detects the reverse force signal, which is amplified by the amplifier 5 and fed back to the control system. The control system adjusts the output torque of the servo motor 4 according to the preset pull force value to achieve precise control of the reverse pull force.

[0103] The preferred embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of the present invention without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A positive pressure reverse tension servo press device, characterized in that, The system includes a servo press body (1), a connecting plate (2), a reducer (3), a servo motor (4), an amplifier (5), and a pressure sensor (6). The pressure sensor (6) is installed inside the servo press body (1). The upper end face of the connecting plate (2) is connected to the lower end face of the housing (122) of the servo press body (1). The output end face of the reducer (3) is connected to the lower end face of the connecting plate (2). The output end face of the servo motor (4) is connected to the input end face of the reducer (3). The amplifier (5) is installed on the side of the servo press body (1). The servo press body (1) includes a first housing (101), a second housing (102), a press head (103), a spline nut (106), a spline shaft (108), a lead screw (109), a lead screw nut (111), a bearing mounting seat (113), and a bearing mounting seat (116). The lower end face of the second housing (102) is fixed to the upper end face of the first housing (101). The spline nut (106) is installed inside the first housing (101), and the spline shaft (108) passes through the spline nut (109). In the mounting hole of 6), the upper end face of the pressure head (103) is connected to the lower end face of the spline shaft (108); the lead screw nut (111) and the spline shaft (108) are connected as a whole by the connecting seat (110), and the lead screw (109) is screwed into the lead screw nut (111); the bearing mounting seat one (113) and the bearing mounting seat two (116) are respectively sleeved on the upper end of the lead screw (109), and the pressure sensor (6) is clamped between the bearing mounting seat one (113) and the bearing mounting seat two (116); When the pressure head (103) contacts the extrusion body or the reverse tension body, the force is transmitted through the bearing mounting seat one (113) to the positive force and the bearing mounting seat two (116) to the pressure sensor (6). At the same time, the screw (109) rotates and drives the screw nut (111) and the spline shaft (108) to perform reciprocating linear motion, thereby realizing the positive pressure and reverse tension action.

2. The positive pressure reverse tension servo press device as described in claim 1, characterized in that, The servo press body (1) also includes a connecting block (104) and a flat key (107); the flat key (107) is installed in the keyway of the spline nut (106), the connecting block (104) fixes the spline nut (106) to the housing (101), and the flat key (107) is used to prevent the spline nut (106) from rotating.

3. The positive pressure reverse tension servo press device as described in claim 1, characterized in that, The servo press body (1) also includes a roller bearing (112); the roller bearing (112) is inserted from the lower end of the lead screw (109), and the upper end of the inner end face of the roller bearing (112) is in contact with the lower end positioning surface of the lead screw (109). The lead screw (109) achieves rotational engagement with the lead screw nut (111) through the roller bearing (112).

4. The positive pressure reverse tension servo press device as described in claim 1, characterized in that, The servo press body (1) also includes a cylindrical pin (135), an angular contact bearing (115), and a retaining ring (114). The cylindrical pin (135) is installed on the housing (102), the angular contact bearing (115) is installed in the positioning hole of the bearing mounting seat (113), and the retaining ring (114) fixes the outer upper end face of the angular contact bearing (115) to the positioning surface of the bearing mounting seat (113). The bearing mounting seat (113) is inserted from the upper end of the lead screw (109), the retaining ring (114) faces downward, the cylindrical pin (135) is fitted into the groove of the bearing mounting seat (113), the inner lower end face of the angular contact bearing (115) is connected to the positioning surface of the upper end face of the lead screw (109), and the cylindrical pin (135) is used to prevent the bearing mounting seat (113) from rotating.

5. The positive pressure reverse tension servo press device as described in claim 1, characterized in that, The servo press body (1) also includes a cylindrical pin two (134), an angular contact bearing two (117), and a retaining ring two (118); the cylindrical pin two (134) is installed on the housing two (102), the angular contact bearing two (117) is installed in the positioning hole of the bearing mounting seat two (116), and the retaining ring two (118) fixes the lower outer end face of the angular contact bearing two (117) to the positioning surface of the bearing mounting seat two (116); the bearing mounting seat two (116) is inserted from the upper end of the lead screw (109), the retaining ring two (118) faces upward, the retaining groove of the bearing mounting seat two (116) is fitted with the cylindrical pin two (134), the lower end face of the bearing mounting seat two (116) contacts the upper end face of the pressure sensor (6), and the cylindrical pin two (134) is used to prevent the bearing mounting seat two (116) from rotating.

6. The positive pressure reverse tension servo press device as described in claim 1, characterized in that, The servo press body (1) also includes a first synchronous pulley (126), a second synchronous pulley (130), a synchronous belt (129), a second flat key (125), and a clamping block (127); the second flat key (125) is installed in the slot of the lead screw (109), the first synchronous pulley (126) is inserted from the upper end of the lead screw (109), the clamping block (127) fixes the first synchronous pulley (126) to the lead screw (109), and the second flat key (125) is used to prevent the first synchronous pulley (126) from moving relative to the lead screw (109); the second synchronous pulley (130) is installed in the output shaft of the reducer (3) and fixed, and the synchronous belt (129) is sleeved on the first synchronous pulley (126) and the second synchronous pulley (130).

7. The positive pressure reverse tension servo press device as described in claim 6, characterized in that, The servo press body (1) also includes an adjusting block (131), an adjusting seat (133), and an adjusting bolt (132). The adjusting block (131) is installed on the connecting plate (2), the adjusting seat (133) is installed on the housing (122), and the adjusting bolt (132) connects the adjusting seat (133) and the adjusting block (131). By adjusting the bolt (132), the distance between the adjusting seat (133) and the adjusting block (131) is changed, thereby adjusting the tension of the synchronous belt (129).

8. The positive pressure reverse tension servo press device as described in claim 1, characterized in that, The servo press body (1) also includes a support ring (120), a second roller bearing (121), and a locking nut (123); the support ring (120) is fitted from the upper end of the lead screw (109), and the lower end face of the support ring (120) contacts the upper inner end face of the second angular contact bearing (117); the second roller bearing (121) is fitted from the upper end of the lead screw (109), and the lower inner end face of the second roller bearing (121) contacts the upper end face of the support ring (120); the locking nut (123) is locked from the upper end of the lead screw (109), and the lower end face of the locking nut (123) is locked to the upper inner end face of the second roller bearing (121).

9. The positive pressure reverse tension servo press device as described in claim 1, characterized in that, The servo press body (1) also includes a first sealing ring (105), a second sealing ring (119), and a third sealing ring (124); the first sealing ring (105) is installed on the lower end face of the first housing (101) for dust protection of the spline shaft (108); the second sealing ring (119) is placed on the upper end face of the second housing (102), and when the lower end face of the third housing (122) is connected to the upper end face of the second housing (102), the second sealing ring (119) is inserted into the groove of the lower end face of the third housing (122); the third sealing ring (124) is sleeved from the upper end of the lead screw (109) and inserted into the groove of the lead screw (109).

10. The positive pressure reverse tension servo press device as described in claim 1, characterized in that, The servo press body (1) also includes a cover plate (128); the cover plate (128) is installed on the housing three (122) and is used to protect the synchronous wheel one (126), the pressing block (127) and other components inside the housing three (122).

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