A constant-force compression device and method for achieving bearing necking in elongated parts.

Abstract

This invention discloses a constant-force pressing device and method for closing bearings on elongated parts. In the device, a fixed angle seat, a guide rail slider assembly, and a baffle force measuring assembly are mounted on the platform of a mobile cabinet. A pressure head assembly is mounted on the two side sliders of the guide rail slider assembly, located between the fixed angle seat and the baffle force measuring assembly. The actuating end of an electric cylinder passes through a hole in the middle end plate of the fixed angle seat and connects to the connecting shaft of the pressure head assembly. The mandrel of the bearing fixing mold passes through the bearing mounting hole of the bearing to be closed in the lug of the elongated part. The closing molds at both ends abut and press against the pressure plate during bearing closing. A control system connected to the electric cylinder controls the actuating end of the electric cylinder to extend, pushing the pressure plate towards the baffle and pressing the bearing fixing mold located between the pressure plate and the baffle. This causes the closing molds at both ends to simultaneously apply pressure to both ends of the bearing with their annular blade structures on their opposite end faces, thus achieving the closing and fixing of the bearing on the lug of the elongated part.

Description

Technical Field

[0001] This invention relates to, but is not limited to, the field of bearing installation technology, and particularly to a constant force compression device and method for achieving bearing narrowing of long and narrow parts. Background Technology

[0002] The elongated part has multiple lugs on its side, which are close together. The axis of the lug housing holes is parallel to and close to the length of the part. When machining the bearing end, a high and accurate pressure is required. The pressure must be applied gradually at a certain loading rate to reach the appropriate value, and impact force must be strictly prohibited. When the appropriate pressure is reached, the equipment can hold it for a certain period before unloading. The press working surface is located at the center of the press. The lugs on the elongated part with the bearing cannot be placed on the press working surface. Furthermore, due to the poor pressure accuracy of the press itself, it is difficult to place the end in the exact center, resulting in insufficient pressure precision and preventing the bearing end from being machined.

[0003] Chinese patent CN 213559516 U discloses a tooling for closing the bearing end of a bracket-type component. This tooling facilitates the closing assembly of the bracket-type component bearing by moving the working surface of the press to the edge of the worktable. However, this utility model patent uses edge force to achieve the closing, resulting in simultaneous force on the protective block and the bracket-type component. This leads to large force errors, and the axial direction of the lug housing hole in the bracket part differs from that of the elongated parts mentioned in this invention patent, thus failing to achieve the closing function for bearings in elongated parts.

[0004] Existing bearing clamping devices typically use a press to control the driving force, but their structure and force accuracy cannot meet the requirements for precise clamping of long and narrow parts. Summary of the Invention

[0005] The purpose of this invention is to solve the above-mentioned technical problems. This invention provides a constant force compression device and method for achieving bearing retraction in elongated parts, which solves the problem that existing methods for bearing retraction in elongated parts use a press to control the driving force, and the structure and force accuracy are difficult to meet the requirements for precise constant force compression in elongated parts.

[0006] The technical solution of the present invention: The present invention provides a constant force pressing device for bearing closing of narrow and long parts, comprising: an electric cylinder 2, a fixed angle seat 3, a pressing head assembly 4, a guide rail slider assembly 5, a bearing fixing mold 6, a baffle force measuring assembly 7, a moving cabinet 8, and a control system 9; the guide rail slider assembly 5 includes two parallel guide rails 51 and a slider 52 slidably disposed on each guide rail 51;

[0007] The fixed angle seat 3, the guide rail slider assembly 5, and the baffle force measuring assembly 7 are fixedly installed on the platform of the mobile cabinet 8; the two parallel guide rails 51 in the guide rail slider assembly 5 are fixedly installed on both sides of the fixed angle seat 3 and the baffle force measuring assembly 7, and the pressure head assembly 4 is installed on the two side sliders 52 and located between the fixed angle seat 3 and the baffle force measuring assembly 7; the electric cylinder 2 is fixedly installed on the fixed angle seat 3.

[0008] The pressure head assembly 4 includes a pressure plate 43 vertically mounted on the two side sliders 52, and a connecting shaft 42 vertically fixed on one side end face of the pressure plate 43; the actuating end of the electric cylinder 2 passes through the clearance hole on the middle end plate of the fixed angle seat 3 and is fixedly connected to the connecting shaft 42 of the pressure head assembly 4, so as to drive the entire pressure head assembly 4 to move along the guide rail through the connecting shaft 42 when the actuating end of the electric cylinder 2 moves.

[0009] The baffle force measuring assembly 7 includes: a baffle 72 arranged parallel to the pressure plate 43, and a force sensor 71 disposed in the middle groove on the upper part of the end face of the baffle 72 near the pressure plate 43;

[0010] The bearing fixing mold 6 includes: a mandrel 61 and closing molds 62 connected to both ends of the mandrel 61; the mandrel 61 passes through the bearing hole of the bearing 10 to be closed in the bearing mounting hole on the lug of the elongated part; the closing molds 62 at both ends are set as cylinders with annular blade structures on opposite end faces; one end of the closing mold 62 is provided with a countersunk hole on its outer end face for connecting with the end of the force sensor 71; the other end of the closing mold 62 is set as a plane for pressing against the pressure plate 43 when the bearing is closed.

[0011] The control system 9 is located inside the mobile cabinet 8. The control system 9 is connected to the electric cylinder 2. When performing bearing closing on the long and narrow part 1, the control system 9 extends the actuating end of the electric cylinder 2 to push the pressure plate 43 toward the baffle 72 and press the bearing fixing mold 6 located between the pressure plate 43 and the baffle 72. This causes the closing molds 62 at both ends to apply pressure to both ends of the bearing with their annular blade structure on their opposite end faces, thereby achieving the closing and fixing of the bearing 10 on the lug of the long and narrow part 1.

[0012] Optionally, in the constant force compression device described above for achieving bearing narrowing of elongated parts,

[0013] The pressure head assembly 4 further includes: a T-shaped stop pin 41; a countersunk hole is provided on the side end face of the pressure plate 43 near the baffle 72, and the pin end of the T-shaped stop pin 41 passes through the countersunk hole of the pressure plate 43, so that its T-shaped end is restricted in the countersunk hole; one end of the connecting shaft 42 is provided with an internal thread for screwing and fixing with the external thread of the pin end of the T-shaped stop pin 41, and the other end of the connecting shaft 42 is provided with an external thread for screwing and fixing with the external thread of the actuating end of the electric cylinder 2.

[0014] Optionally, in the constant force compression device described above for achieving bearing narrowing of elongated parts,

[0015] The pressure head assembly 4 further includes: connecting plates symmetrically arranged on both sides of the pressure plate 43, and reinforcing ribs arranged between the connecting plates and the pressure plate 43; the pressure head assembly 4 is fixedly connected to the corresponding sliders 52 through the connecting plates on both sides.

[0016] Optionally, in the constant force compression device described above for achieving bearing narrowing of elongated parts,

[0017] In the bearing fixing mold 6, the opposite end faces of the two closing molds 62 are provided with central shaft holes. The diameter of the middle shaft of the mandrel 61 matches the diameter of the bearing inner hole of the bearing to be closed. The diameters of the cylindrical shafts on both sides match the diameters of the central shaft holes of the closing molds 62 at both ends, and are used to insert and fix them on the closing molds 62 at both ends.

[0018] Among them, the outer inclination angle of the annular blade structure set on the opposite end face of the two closing molds 62 is the same as the outer inclination angle of the bearing mounting hole on the ear plate of the elongated part 1, and the diameter and depth of the countersunk hole on the outer end face of one closing mold 62 match the protrusion structure on the end face of the force sensor 71.

[0019] Optionally, in the constant force pressing device for achieving bearing closing of elongated parts as described above, the upper end plane of the pressure plate 43 is higher than the upper end face of the electric cylinder 2, and the distance between the two upper end faces is greater than the distance between the bearing mounting hole axis on the ear plate of the elongated part 1 and the lower end face of the part.

[0020] The upper surface of the baffle 72 is flush with the upper surface of the pressure plate 43, and the distance between the axis of the force sensor 71 and the upper surface of the baffle 72 is less than the distance between the axis of the bearing mounting hole on the ear piece of the elongated part 1 and the lower surface of the part.

[0021] Optionally, in the constant force compression device described above for achieving bearing narrowing of elongated parts,

[0022] The stroke of the electric cylinder 2 is a, the overall length of the bearing fixing mold 6 is b, and the farthest distance between the pressure plate 43 and the baffle 72 is c. Therefore, the initial position of the pressure plate 43 and the distance between the baffle 72 are set to satisfy the following constraints:

[0023] c < a + b and c > b.

[0024] Optionally, in the constant force compression device described above for achieving bearing narrowing of elongated parts,

[0025] The control system 9 includes: a controller 92 disposed inside the mobile cabinet 8, and a screen 91 disposed on the table surface of the mobile cabinet 8;

[0026] The control system 9 is a servo feedback control system 9, which controls the pressure generated after the pressure plate 43 contacts the bearing fixing mold 6 to be gradually applied to the set pressure value at a preset loading rate; and adjusts the pressure applied by the electric cylinder 2 and the loading rate according to the pressure value fed back by the force sensor 71 in the baffle force measuring component 7. When the pressure is loaded to the set pressure value, after holding the pressure for a preset time, the electric cylinder 2 is controlled to drive the pressure head component 4 to automatically retract, completing the bearing closing; the screen 91 is used to display the running speed and position of the electric cylinder and the pressure data on the bearing in real time, and outputs a curve of pressure changing with time and position.

[0027] Secondly, embodiments of the present invention also provide a constant-force compression method for achieving bearing narrowing of elongated parts, wherein the constant-force compression method for bearing narrowing of elongated parts is performed using a constant-force compression device as described in any of the above claims, the constant-force compression method comprising:

[0028] Step 1: Before installation, check the structural integrity and surface cleanliness of the bearing;

[0029] Step 2: The bearing is clamped by the end-closing molds 62 in the bearing fixing mold 6, including: the bearing to be closed is inserted into the bearing mounting hole on the lug of the elongated part 1, the mandrel 61 passes through the bearing hole, and the end-closing molds 62 are arranged opposite each other with their annular blade structure and are both connected to the two ends of the mandrel 61 facing the bearing direction. The annular blade structure of the end-closing molds 62 is stuck into the groove of the bearing.

[0030] Step 3: Place the bearing fixing mold 6 between the pressure plate 43 and the baffle 72. The countersunk hole on the outer end face of one end of the closing mold 62 is connected to the protrusion of the force sensor 71 set on the end face of the baffle 72 and is close to the force sensor 71. The other end of the closing mold 62 is set close to the end face of the pressure plate 43.

[0031] Step 4: The electric cylinder 2 is started by the control system 9 and its actuating end is moved towards the bearing side. After the pressure plate 43 of the pressure head assembly 4 presses against the other end closing mold 62, the pressure generated gradually increases to the set pressure value according to the preset loading rate. Under the action of pressure, the axial direction of the bearing fixing mold 6 is automatically perpendicular to the end face of the baffle 72.

[0032] Step 5: After the control system 9 detects that the pressure value fed back by the force sensor 71 has reached the set pressure value, it controls the electric cylinder 2 to drive the pressure head assembly 4 to automatically retract after the pressure holding time is preset, thus completing the bearing closing operation.

[0033] Optionally, the constant force compression method for achieving bearing narrowing of elongated parts as described above further includes:

[0034] Step 6: Perform a quality inspection on the bearing after the bearing end-closing operation is completed. The quality inspection standards include:

[0035] Bearing visual inspection: There should be no wrinkles, cracks and burrs at the end of the bearing. Extrusion marks are allowed. The edge gap at the end of the bearing should be less than 0.1mm.

[0036] Check the no-load starting torque of the bearing; the no-load starting torque meets the installation requirements.

[0037] Check the axial thrust of the bearing. Under the specified axial thrust, there should be no relative displacement between the bearing and the housing bore, or the relative displacement should not exceed 0.1 mm.

[0038] Optionally, in the constant force compression method for achieving bearing narrowing of long and narrow parts as described above, the method for determining the set pressure value in step 4 is as follows:

[0039] The baffle 72 in the baffle force measuring assembly 7 undergoes a small-angle deformation under pressure, so that the angle between the axis of the bearing fixing mold 6 and the normal of the baffle 72 is α.

[0040] The pressure value fed back by the pressure sensor 71 is F1, and the axial pressure of the bearing fixing mold 6 is F2. When the control system 9 detects the feedback pressure value F1 = F2cosα, it indicates that the axial pressure applied to the bearing fixing mold 6 has reached the set pressure value.

[0041] The beneficial effects of the present invention: The embodiments of the present invention provide a constant force pressing device and method for achieving bearing closing on elongated parts. Targeting the special structure of elongated parts and the bearing mounted on the lugs of such parts, a fixed angle seat 3, a guide rail slider assembly 5, a baffle force measuring assembly 7, and a pressure head assembly 4 mounted on the guide rail slider assembly 5 are used. An electric cylinder 2 pushes the pressure head assembly 4, causing the bearing fixing mold 6 between the pressure plate 43 of the pressure head assembly 4 and the baffle 72 of the baffle force measuring assembly 7 to exert pressure on the bearing to be closed. The annular blade structure at both ends of the bearing fixing mold 6, which engages with the bearing end faces, simultaneously applies pressure to both end faces of the bearing, thereby achieving the closing and fixing of the bearing 10 on the lugs of the elongated part. The technical solution provided by the embodiments of the present invention has the following beneficial effects:

[0042] (1) The overall strength deformation of the constant force compression device for bearing end provided by the present invention is very small and the force value is accurate. It adopts a double guide rail with double slider structure, stop pin constraint, force value feedback, servo motor, strength analysis, and frame structure on the upper surface of the moving cabinet to improve the overall strength and force value accuracy of the device.

[0043] (2) The bearing end cap pressure device provided by the present invention is designed based on the structural characteristics of long and narrow parts. It can realize the end cap function of bearings in long and narrow parts, and can meet the precise end cap requirements of other complex parts. It has strong versatility.

[0044] (3) The bearing end cap pressure device provided by the present invention can be moved and used in different work positions. It is lightweight, simple and easy to operate, and convenient and quick. Attached Figure Description

[0045] The accompanying drawings are provided to further understand the technical solutions of the present invention and constitute a part of the specification. They are used together with the embodiments of this application to explain the technical solutions of the present invention and do not constitute a limitation on the technical solutions of the present invention.

[0046] Figure 1 This is a schematic diagram of the overall structure of a constant force compression device for achieving bearing narrowing of long and narrow parts, provided by an embodiment of the present invention.

[0047] Figure 2 for Figure 1 The illustrated embodiment provides a partially enlarged structural diagram of a constant force compression device for achieving bearing narrowing of elongated parts.

[0048] Figure 3 A schematic diagram of the structure of the elongated part used in the constant force compression device provided in the embodiment of the present invention;

[0049] Figure 4 for Figure 1 The illustrated embodiment provides a schematic diagram of the bearing fixing mold in a constant force compression device for narrow and elongated parts to achieve bearing narrowing.

[0050] Figure 5 for Figure 1 The schematic diagram shown is an overall structural diagram of the pressure head assembly in the constant force pressing device for narrow and elongated parts to achieve bearing narrowing.

[0051] Figure 6 for Figure 5 A cross-sectional view of the pressure head assembly provided in the illustrated embodiment;

[0052] Figure 7 for Figure 1 A schematic diagram of the structural parameters in the constant force compression device for achieving bearing narrowing of elongated parts provided in the embodiment shown;

[0053] Figure 8 This is a flowchart of a constant-force compression method for achieving bearing narrowing of long and narrow parts, provided as an embodiment of the present invention.

[0054] Explanation of reference numerals in the attached figures:

[0055] 1. Narrow and elongated parts; 2. Electric cylinder; 3. Fixed angle seat; 4. Pressure head assembly; 41. T-shaped stop pin; 42. Connecting shaft; 43. Pressure plate; 5. Guide rail slider assembly; 51. Guide rail; 52. Slider; 6. Bearing fixing mold; 61. Mandrel; 62. Closing mold; 7. Baffle force measuring assembly; 71. Force sensor; 72. Baffle; 8. Mobile cabinet; 9. Control system; 91. Screen; 92. Controller; 10. Bearing. Detailed Implementation

[0056] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

[0057] As explained in the background section, there is a need for the structure of elongated parts and the bearing end caps on their side plates. However, existing bearing end capping devices typically use a press to control the driving force, and their structure and force accuracy cannot meet the requirements for precise end capping of elongated parts.

[0058] To address the aforementioned problems and the bearing end reduction requirements for elongated parts, embodiments of the present invention provide a constant force compression device and method for achieving bearing end reduction in elongated parts.

[0059] The present invention provides the following specific embodiments, which can be combined with each other. For the same or similar concepts or processes, they may not be described again in some embodiments.

[0060] Figure 1 This is a schematic diagram of the overall structure of a constant force compression device for achieving bearing narrowing of elongated parts, provided by an embodiment of the present invention. Figure 2 for Figure 1 The illustrated embodiment provides a partially enlarged structural diagram of a constant-force compression device for achieving bearing narrowing of elongated parts. Figure 2 The diagram illustrates the structural relationship between the fixed angle seat 3, the pressure head assembly 4, the guide rail slider assembly 5, and the baffle force measuring assembly 7. (Refer to...) Figure 2 and Figure 3 As shown, the overall structure of the constant force pressing device for bearing closing of narrow parts provided in this embodiment of the invention includes: an electric cylinder 2, a fixed angle seat 3, a pressing head assembly 4, a guide rail slider assembly 5 (including a guide rail 51 and a slider 52), a bearing fixing mold 6, a baffle force measuring assembly 7 (including a force sensor 71 and a baffle 72), a moving cabinet 8, and a control system 9; the guide rail slider assembly 5 includes two parallel guide rails 51 and a slider 52 slidably disposed on each guide rail 51.

[0061] like Figure 3The diagram shown is a structural schematic of the elongated part used in the constant force compression device provided in an embodiment of the present invention. Figure 3 The long and narrow part 1 has multiple lugs on one side (only one lug is shown in the figure). The bearing is pressed into the bearing mounting hole of the lug, and both ends of the lug are provided with an outer inclined angle to cooperate with the bearing's closing structure.

[0062] like Figure 1 and Figure 2 In the structure of the constant force pressing device shown, the fixed angle seat 3, the guide rail slider assembly 5, and the baffle force measuring assembly 7 are fixedly installed on the table of the mobile cabinet 8; the two parallel guide rails 51 in the guide rail slider assembly 5 are fixedly installed on both sides of the fixed angle seat 3 and the baffle force measuring assembly 7, and the pressure head assembly 4 is installed on the two side sliders 52 and located between the fixed angle seat 3 and the baffle force measuring assembly 7; the electric cylinder 2 is fixedly installed on the fixed angle seat 3 so as to fix the electric cylinder 2 on the table of the mobile cabinet 8 through the fixed angle seat 3.

[0063] It can be seen that the end plate of the fixed angle seat 3, the pressure plate 43 in the pressure head assembly 4, and the baffle 72 in the baffle force measuring assembly 7 are arranged in parallel in the embodiment of the present invention, and the fixed angle seat 3, the pressure head assembly 4, the guide rail slider assembly 5 and the baffle force measuring assembly 7 are all symmetrical structures along the center line of the two guide rails 51.

[0064] like Figure 2 The diagram illustrates the structure of the pressure head assembly 4, which includes a pressure plate 43 vertically mounted on two side sliders 52, and a connecting shaft 42 vertically fixed on one end face of the pressure plate 43. The actuating end of the electric cylinder 2 passes through the clearance hole on the middle end plate of the fixed angle seat 3 and is fixedly connected to the connecting shaft 42 of the pressure head assembly 4. When the actuating end of the electric cylinder 2 moves, the connecting shaft 42 can drive the entire pressure head assembly 4 to move along the guide rail.

[0065] like Figure 2 The diagram illustrates the structure of the baffle force measuring assembly 7, which includes: a baffle 72 arranged parallel to the pressure plate 43, a force sensor 71 disposed in the middle groove on the upper part of the end face of the baffle 72 near the pressure plate 43, and a plurality of reinforcing ribs disposed on the other side of the baffle 72.

[0066] Figure 4 for Figure 1The schematic diagram of the bearing fixing mold in the constant force pressing device for closing the bearing opening of elongated parts provided in the embodiment shown is shown. In this embodiment, the bearing fixing mold 6 includes: a mandrel 61 and closing molds 62 respectively connected to both ends of the mandrel 61; since the bearing to be closed is installed in the bearing mounting hole on the lug of the elongated part, the mandrel 61 passes through the bearing hole of the bearing on the elongated part, and the closing molds 62 at both ends are set as cylinders with annular blade structures on opposite end faces. The outer inclination angle of the blade structure is the same as the outer inclination angle of the bearing mounting hole on the lug. One end closing mold 62 ( Figure 4 The outer end face of the right end of the device is provided with a countersunk hole for connection with the end of the force sensor 71, and the other end is closed by a die 62. Figure 4 The outer end face of the left end of the bearing is set as a plane, which is used to abut and press against the pressure plate 43 when the bearing is closed.

[0067] like Figure 1 As shown, the main structure of the control system 9 is set inside the mobile cabinet 8. The control system 9 is connected to the electric cylinder 2. When performing bearing closing on the narrow and elongated parts, the control system 9 extends the actuating end of the electric cylinder 2 to push the pressure plate 43 to move towards the baffle 72 and press the bearing fixing mold 6 located between the pressure plate 43 and the baffle 72. This causes the closing molds 62 at both ends to apply pressure to both ends of the bearing with the annular blade structure on their opposite end faces, thereby realizing the closing and fixing of the bearing 10 on the lug of the narrow and elongated parts 1.

[0068] In one implementation of the present invention, a possible implementation of the pressure head assembly 4 is provided. Figure 5 for Figure 1 The schematic diagram shown in the embodiment is an overall structural diagram of the pressure head assembly in a constant force compression device for narrow and elongated parts to achieve bearing narrowing. Figure 6 for Figure 5 A cross-sectional view of the pressure head assembly provided in the illustrated embodiment. Figure 5 and Figure 6 As shown, in addition to the aforementioned pressure plate 43 and connecting shaft 42, the pressure head assembly 4 in this implementation also includes a T-shaped stop pin 41.

[0069] In this implementation, a countersunk hole is provided on the side end face of the pressure plate 43 near the baffle 72. The pin end of the T-shaped stop pin 41 passes through the countersunk hole of the pressure plate 43, so that its T-shaped end is restricted in the countersunk hole. One end of the connecting shaft 42 is provided with an internal thread for screwing and fixing with the external thread of the pin end of the T-shaped stop pin 41. The other end of the connecting shaft 42 is provided with an external thread for screwing and fixing with the external thread of the actuating end of the electric cylinder 2.

[0070] Furthermore, in this implementation, the pressure head assembly 4 also includes: connecting plates symmetrically arranged on both sides of the pressure plate 43, and reinforcing ribs disposed between the connecting plates and the pressure plate 43, such as... Figure 5 As shown, the pressure plate 43 forms an "I"-shaped symmetrical structure. Additionally, the pressure head assembly 4 is fixedly connected to the corresponding sliders 52 via connecting plates on both sides. Correspondingly, the guide rail slider assembly 5 is configured with a double guide rail 51 and a double slider 52 structure, with two sliders 52 on each guide rail 51. The four sliders 52 are symmetrically arranged along the pressure plate 43, and each connecting plate of the pressure head assembly 4 is fixedly connected to two sliders 52 on the same side.

[0071] In one implementation of this invention, a possible implementation of the bearing fixing mold 6 is provided. For example... Figure 4 As shown, in the bearing fixing mold 6 of this implementation, the opposite end faces of the two closing molds 62 are provided with central shaft holes. The diameter of the middle shaft of the mandrel 61 matches the diameter of the bearing inner hole of the bearing to be closed. The diameters of the cylindrical shafts on both sides match the diameters of the central shaft holes of the closing molds 62 at both ends, and are used to insert and fix them on the closing molds 62 at both ends.

[0072] In this implementation, the outer inclination angle of the annular blade structure set on the opposite end face of the two closing molds 62 is the same as the outer inclination angle of the bearing mounting hole on the lug of the elongated part, so that the bearing after closing is level with the inclination angle on the lug end face of the elongated part. The diameter and depth of the countersunk hole on the outer end face of one closing mold 62 match the protrusion structure on the end face of the force sensor 71, so that the closing mold 62 at this end is fixed to the force sensor 71. The closing mold 62 at the other end is close to the end face of the pressure plate 43 before pressure is applied.

[0073] In practical applications, the mandrel 61 can be set as an integral structure with the closing mold 62 at either end. After the closing mold 62 with the mandrel 61 passes through the bearing hole at the end of its mandrel 61, it is fixedly connected to the opposite end face of the other closing mold 62, and pressure is subsequently applied to the bearing.

[0074] It should be noted that, based on Figure 3 The specific structure of the elongated part shown is such that, when the bearing on the lug of this type of part is narrowed, the part itself is placed directly above the overall constant force compression device. Therefore, the structural constraints in the constant force compression device should meet the following conditions:

[0075] First, the upper end plane of the pressure plate 43 is higher than the upper end face of the electric cylinder 2, and the distance between the two upper end faces is greater than the distance between the bearing mounting hole axis on the ear piece of the elongated part 1 and the lower end face of the part, so as to avoid structural interference between the elongated part 1 and the constant force pressing device.

[0076] Second, the upper end face of the baffle 72 is flush with the upper end face of the pressure plate 43. The distance between the axis of the force sensor 71 and the upper end face of the baffle 72 is less than the distance between the axis of the bearing mounting hole on the ear piece of the narrow part 1 and the lower end face of the part, so that the end of the bearing fixing mold 62 after the bearing is assembled can be connected to the end face of the force sensor 71.

[0077] In one implementation of this invention, a parameter description of the structural design in the constant force compression device is provided, such as... Figure 7 As shown, Figure 1 The schematic diagram shows the structural parameters of the constant force compression device for narrow and elongated parts to achieve bearing narrowing provided in the embodiment shown.

[0078] In this implementation, the stroke of the electric cylinder 2 is a, the overall length of the bearing fixing mold 6 is b, and the farthest distance between the pressure plate 43 and the baffle 72 is c. Therefore, setting the initial position of the pressure plate 43 and the distance between the baffle 72 satisfies the following constraints:

[0079] c < a + b and c > b.

[0080] In one implementation of this invention, a possible implementation of the control system 9 is provided. The control system 9 in this implementation includes a controller 92 and a screen 91. The controller 92 is installed inside the mobile cabinet 8 and serves as the main control component for controlling the closing operation. The screen 91 is installed above the tabletop of the mobile cabinet 8 and is used to display parameters of the closing operation and feedback pressure, etc.

[0081] In this implementation, the control system 9 is a servo feedback control system 9, which controls the pressure generated after the pressure plate 43 contacts the bearing fixing mold 6, gradually applying pressure to the set pressure value at a preset loading rate; and adjusts the pressure applied by the electric cylinder 2 and the loading rate according to the pressure value fed back by the force sensor 71 in the baffle force measuring component 7. When the pressure is loaded to the set pressure value, after holding the pressure for a preset time, the electric cylinder 2 is controlled to drive the pressure head component 4 to automatically retract, completing the bearing closing; the screen 91 is used to display the running speed and position of the electric cylinder and the pressure data on the bearing in real time, and outputs a curve of pressure changing with time and position.

[0082] Furthermore, in this implementation, the electric cylinder 2 is driven by a servo motor, which is equipped with a multi-turn absolute encoder to provide real-time feedback on the motor position.

[0083] In one embodiment of the present invention, the upper surface of the mobile cabinet 8 is a frame structure, the main body of the mobile cabinet 8 is made of aluminum alloy, and it has four casters at the bottom for easy overall movement. Additionally, the bearing is a spherical bearing, and the outer ring of the spherical bearing has grooves.

[0084] The constant-force pressing device for closing bearings on elongated parts provided in this embodiment of the invention addresses the special structure of elongated parts and the bearings mounted on the lugs of such parts. It employs a fixed angle seat 3, a guide rail slider assembly 5, a baffle force measuring assembly 7, and a pressure head assembly 4 mounted on the guide rail slider assembly 5, all fixedly mounted on a mobile cabinet 8. An electric cylinder 2 pushes the pressure head assembly 4, causing pressure to be applied to the bearing fixing mold 6 between the pressure plate 43 of the pressure head assembly 4 and the baffle 72 of the baffle force measuring assembly 7. The annular blade structure at both ends of the bearing fixing mold 6, which engages with the bearing end faces, simultaneously applies pressure to both end faces of the bearing, thereby achieving the closing and fixing of the bearing 10 on the lugs of the elongated part. The constant-force pressing device provided in this embodiment of the invention has the following beneficial effects:

[0085] (1) The overall strength deformation of the constant force compression device for bearing end provided by the present invention is very small and the force value is accurate. It adopts a double guide rail with double slider structure, stop pin constraint, force value feedback, servo motor, strength analysis, and frame structure on the upper surface of the moving cabinet to improve the overall strength and force value accuracy of the device.

[0086] (2) The bearing end cap pressure device provided by the present invention is designed based on the structural characteristics of long and narrow parts. It can realize the end cap function of bearings in long and narrow parts, and can meet the precise end cap requirements of other complex parts. It has strong versatility.

[0087] (3) The bearing end cap pressure device provided by the present invention can be moved and used in different work positions. It is lightweight, simple and easy to operate, and convenient and quick.

[0088] Based on the constant-force compression device for achieving bearing narrowing of elongated parts provided in the above embodiments of the present invention, the embodiments of the present invention also provide a constant-force compression method for achieving bearing narrowing of elongated parts. The constant-force compression method for bearings on elongated parts can be executed using the constant-force compression device for achieving bearing narrowing of elongated parts provided in any of the above embodiments. Figure 8 The diagram shows a flowchart of a constant-force compression method for achieving bearing narrowing of elongated parts according to an embodiment of the present invention. This constant-force compression method may include the following steps:

[0089] Step 1: Before installation, check the structural integrity and surface cleanliness of the bearing;

[0090] In step 1, the bearing should be free from damage, rust, metal shavings, or other contaminants.

[0091] Step 2: The bearing is clamped by the end-closing molds 62 in the bearing fixing mold 6, including: the bearing to be closed is inserted into the bearing mounting hole on the lug of the elongated part, the mandrel 61 passes through the bearing hole, the end-closing molds 62 are arranged opposite each other with their annular blade structure and are both connected to the two ends of the mandrel 61 facing the bearing direction, and the annular blade structure of the end-closing molds 62 is stuck into the groove of the bearing.

[0092] Step 3: Place the bearing fixing mold 6 between the pressure plate 43 and the baffle 72. The countersunk hole on the outer end face of one end of the closing mold 62 is connected to the protrusion of the force sensor 71 set on the end face of the baffle 72 and is close to the force sensor 71. The other end of the closing mold 62 is set close to the end face of the pressure plate 43.

[0093] Step 4: The electric cylinder 2 is started by the control system 9 and its actuating end is moved towards the bearing side. After the pressure plate 43 of the pressure head assembly 4 presses against the other end closing mold 62, the pressure generated gradually increases to the set pressure value according to the preset loading rate. Under the action of pressure, the axial direction of the bearing fixing mold 6 is automatically perpendicular to the end face of the baffle 72.

[0094] Step 5: After the control system 9 detects that the pressure value fed back by the force sensor 71 has reached the set pressure value, it controls the electric cylinder 2 to drive the pressure head assembly 4 to automatically retract after the pressure holding time is preset, thus completing the bearing closing operation.

[0095] Furthermore, the constant-force compression method for achieving bearing narrowing of elongated parts provided in this embodiment of the invention may further include the following steps:

[0096] Step 6: Perform a quality inspection on the bearings after the bearing end-closing operation. The quality inspection standards include:

[0097] Bearing visual inspection: There should be no wrinkles, cracks and burrs at the end of the bearing. Extrusion marks are allowed. The edge gap at the end of the bearing should be less than 0.1mm.

[0098] Check the no-load starting torque of the bearing; the no-load starting torque meets the installation requirements.

[0099] Check the axial thrust of the bearing. Under the specified axial thrust, there should be no relative displacement between the bearing and the housing bore, or the relative displacement should not exceed 0.1 mm.

[0100] In one implementation of this invention, the method for determining the pressure value in step 4 is, for example:

[0101] Considering that the baffle 72 in the baffle force measuring assembly 7 undergoes a small-angle deformation under pressure, the angle between the axis of the bearing fixing mold 6 and the normal of the baffle 72 is α.

[0102] In this implementation, the pressure value fed back by the pressure sensor 71 is F1, and the axial pressure of the bearing fixing mold 6 is F2. When the control system 9 detects the fed-back pressure value F1, it is:

[0103] When F1 = F2cosα, it indicates that the axial pressure applied to the bearing fixing mold 6 has reached the set pressure value. In this embodiment of the invention, the value of α can be obtained by strength simulation using finite element software.

[0104] While the embodiments disclosed in this invention are as described above, they are merely illustrative of the embodiments to facilitate understanding of the invention and are not intended to limit the invention. Any person skilled in the art to which this invention pertains may make any modifications and variations in the form and details of the implementation without departing from the spirit and scope disclosed herein; however, the scope of patent protection for this invention shall still be determined by the scope defined in the appended claims.

Claims

1. A constant-force compression device for achieving bearing necking in elongated parts, characterized in that, include: Electric cylinder (2), fixed angle seat (3), pressure head assembly (4), guide rail slider assembly (5), bearing fixing mold (6), baffle force measuring assembly (7), mobile cabinet (8) and control system (9); the guide rail slider assembly (5) includes two parallel guide rails (51) and a slider (52) slidably disposed on each guide rail (51); The fixed angle seat (3), guide rail slider assembly (5), and baffle force measuring assembly (7) are fixedly installed on the table of the mobile cabinet (8); the two parallel guide rails (51) in the guide rail slider assembly (5) are fixedly installed on both sides of the fixed angle seat (3) and the baffle force measuring assembly (7), and the pressure head assembly (4) is installed on the two side sliders (52) and located between the fixed angle seat (3) and the baffle force measuring assembly (7); the electric cylinder (2) is fixedly installed on the fixed angle seat (3); The pressure head assembly (4) includes a pressure plate (43) vertically mounted on the two side sliders (52), and a connecting shaft (42) vertically fixed on one side end face of the pressure plate (43); the actuating end of the electric cylinder (2) passes through the clearance hole on the middle end plate of the fixed angle seat (3) and is fixedly connected to the connecting shaft (42) of the pressure head assembly (4), so as to drive the entire pressure head assembly (4) to move along the guide rail through the connecting shaft (42) when the actuating end of the electric cylinder (2) moves; The baffle force measuring assembly (7) includes: a baffle (72) arranged parallel to the pressure plate (43), and a force sensor (71) disposed in the middle groove on the upper part of the end face of the baffle (72) near the pressure plate (43); The bearing fixing mold (6) includes: a mandrel (61) and closing molds (62) connected to both ends of the mandrel (61); the mandrel (61) passes through the bearing hole of the bearing to be closed (10) in the bearing mounting hole on the lug of the elongated part; the closing molds (62) at both ends are set as cylinders with annular blade structure on opposite end faces; one end of the closing mold (62) has a countersunk hole on its outer end face for connecting with the end of the force sensor (71); the other end of the closing mold (62) has a flat surface for pressing against the pressure plate (43) when the bearing is closed. The control system (9) is located inside the mobile cabinet (8). The control system (9) is connected to the electric cylinder (2) and is used to control the actuating end of the electric cylinder (2) to extend when performing bearing closing on the long and narrow part (1) to push the pressure plate (43) to move towards the baffle (72) and press the bearing fixing mold (6) located between the pressure plate (43) and the baffle (72), so that the closing molds (62) at both ends of the bearing simultaneously apply pressure to the two ends of the bearing with the annular blade structure on their opposite end faces, thereby realizing the closing and fixing of the bearing (10) on the lug of the long and narrow part (1).

2. The constant force compression device for achieving bearing narrowing of elongated parts according to claim 1, characterized in that, The pressure head assembly (4) further includes: a T-shaped stop pin (41); a countersunk hole is provided on one end face of the pressure plate (43) near the baffle (72), and the pin end of the T-shaped stop pin (41) passes through the countersunk hole of the pressure plate (43), so that its T-shaped end is restricted in the countersunk hole; one end of the connecting shaft (42) is provided with an internal thread for screwing and fixing with the external thread of the pin end of the T-shaped stop pin (41), and the other end of the connecting shaft (42) is provided with an external thread for screwing and fixing with the external thread of the actuating end of the electric cylinder (2).

3. The constant force compression device for achieving bearing narrowing of elongated parts according to claim 2, characterized in that, The pressure head assembly (4) further includes: connecting plates symmetrically arranged on both sides of the pressure plate (43), and reinforcing ribs arranged between the connecting plates and the pressure plate (43); the pressure head assembly (4) is fixedly connected to the corresponding sliders (52) through the connecting plates on both sides.

4. The constant force compression device for achieving bearing narrowing of elongated parts according to claim 1, characterized in that, In the bearing fixing mold (6), the two closing molds (62) have central shaft holes on their opposite end faces. The diameter of the middle shaft of the mandrel (61) matches the diameter of the bearing inner hole of the bearing to be closed. The diameters of the cylindrical shafts on both sides match the diameters of the central shaft holes of the closing molds (62) at both ends, and are used to insert and fix them on the closing molds (62) at both ends. Among them, the outer inclination angle of the annular blade structure set on the opposite end face of the two closing molds (62) is the same as the outer inclination angle of the bearing mounting hole on the ear plate of the elongated part (1), and the diameter and depth of the countersunk hole on the outer end face of one closing mold (62) match the protrusion structure on the end face of the force sensor (71).

5. The constant force compression device for achieving bearing narrowing of elongated parts according to any one of claims 1 to 4, characterized in that, The upper plane of the pressure plate (43) is higher than the upper surface of the electric cylinder (2), and the distance between the two upper surfaces is greater than the distance between the bearing mounting hole axis on the ear piece of the narrow part (1) and the lower surface of the part. The upper surface of the baffle (72) is flush with the upper surface of the pressure plate (43), and the distance between the axis of the force sensor (71) and the upper surface of the baffle (72) is less than the distance between the axis of the bearing mounting hole on the ear piece of the narrow part (1) and the lower surface of the part.

6. The constant force compression device for achieving bearing narrowing of elongated parts according to any one of claims 1 to 4, characterized in that, The stroke of the electric cylinder (2) is a, the overall length of the bearing fixing mold (6) is b, and the farthest distance between the pressure plate (43) and the baffle (72) is c. Then, the distance between the initial position of the pressure plate (43) and the baffle (72) satisfies the following constraints: c < a + b and c > b.

7. The constant force compression device for achieving bearing narrowing of elongated parts according to any one of claims 1 to 4, characterized in that, The control system (9) includes: a controller (92) disposed inside the mobile cabinet (8) and a screen (91) disposed on the table of the mobile cabinet (8); The control system (9) is a servo feedback control system (9), which is used to control the pressure generated after the pressure plate (43) contacts the bearing fixing mold (6) and gradually apply pressure to the set pressure value at a preset loading rate; and adjust the pressure applied by the electric cylinder (2) and the loading rate according to the pressure value fed back by the force sensor (71) in the baffle force measuring component (7). When the pressure is loaded to the set pressure value, after holding the pressure for a preset time, the electric cylinder (2) is controlled to drive the pressure head component (4) to automatically retract and complete the bearing closing; the screen (91) is used to display the running speed and position of the electric cylinder (2) and the pressure data on the bearing in real time, and output the pressure change curve with time and position.

8. A constant-force compression method for achieving bearing necking in elongated parts, characterized in that, A constant-force compression method for bearings on elongated parts is performed using a constant-force compression device as described in any one of claims 1 to 7, wherein the constant-force compression method includes: Step 1: Before installation, check the structural integrity and surface cleanliness of the bearing; Step 2, clamping the bearing with the end-closing molds (62) in the bearing fixing mold (6), including: inserting the bearing to be closed into the bearing mounting hole on the lug of the elongated part (1), the mandrel (61) passing through the bearing hole, the end-closing molds (62) with their annular blade structure set opposite each other and both facing the bearing direction are connected to the two ends of the mandrel (61), and the annular blade structure of the end-closing molds (62) is stuck into the groove of the bearing; Step 3: Place the bearing fixing mold (6) between the pressure plate (43) and the baffle (72). The countersunk hole on the outer end face of the closing mold (62) at one end is connected to the protrusion of the force sensor (71) on the end face of the baffle (72) and is close to the force sensor (71). The closing mold (62) at the other end is set close to the end face of the pressure plate (43). Step 4: Start the electric cylinder (2) through the control system (9) and control its actuating end to move towards the bearing side. Push the pressure plate (43) of the pressure head assembly (4) to press against the other end closing mold (62). The pressure generated gradually increases to the set pressure value according to the preset loading rate. Under the action of pressure, the axial direction of the bearing fixing mold (6) is automatically perpendicular to the end face of the baffle (72). Step 5: After the control system (9) detects that the pressure value fed back by the force sensor (71) has reached the set pressure value, it controls the electric cylinder (2) to drive the pressure head assembly (4) to automatically retract after the pressure holding time is preset, and completes the bearing closing operation.

9. The constant-force compression method for achieving bearing narrowing in long and narrow parts according to claim 8, characterized in that, Also includes: Step 6: Perform a quality inspection on the bearing after the bearing end-closing operation is completed. The quality inspection standards include: Bearing visual inspection: There should be no wrinkles, cracks and burrs at the end of the bearing. Extrusion marks are allowed. The edge gap at the end of the bearing should be less than 0.1mm. Check the no-load starting torque of the bearing; the no-load starting torque meets the installation requirements. Check the axial thrust of the bearing. Under the specified axial thrust, there should be no relative displacement between the bearing and the housing bore, or the relative displacement should not exceed 0.1 mm.

10. The constant-force compression method for achieving bearing narrowing in long and narrow parts according to claim 8, characterized in that, The method for determining the pressure value in step 4 is as follows: The baffle (72) in the baffle force measuring assembly (7) undergoes a small-angle deformation under pressure, so that the angle between the axis of the bearing fixing mold (6) and the normal of the baffle (72) is α. The pressure value fed back by the pressure sensor (71) is F1, and the axial pressure of the bearing fixing mold (6) is F2. When the control system (9) detects the feedback pressure value F1 = F2cosα, it indicates that the axial pressure applied to the bearing fixing mold (6) has reached the set pressure value.

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