阅读说明：本技术 一种具有精准定位功能的动力电池电芯冲孔装置 (Power battery cell punching device with accurate positioning function ) 是由 杨玲淼 于 2021-09-24 设计创作，主要内容包括：本发明涉及锂离子电池制造技术领域,尤其涉及一种具有精准定位功能的动力电池电芯冲孔装置,包括有滑动底架、T型开孔架、四角开槽架、间歇机构、同步打孔机构等；滑动底架中部固定安装有T型开孔架,滑动底架两侧对称设置有两四角开槽架,四角开槽架上设置有间歇机构,T型开孔架顶面设置有同步打孔机构。通过开槽限位架推动冲孔钻头相向运动,冲孔钻头同时对两电池电芯两边极耳进行冲孔,完成对电池电芯冲孔操作,相对于传统冲孔方式速度更快,提高了对电池电芯进行冲孔的效率。(The invention relates to the technical field of lithium ion battery manufacturing, in particular to a power battery cell punching device with an accurate positioning function, which comprises a sliding bottom frame, a T-shaped slotting frame, four-corner slotting frames, an intermittent mechanism, a synchronous punching mechanism and the like; the middle of the sliding bottom frame is fixedly provided with a T-shaped opening frame, two four-corner opening frames are symmetrically arranged on two sides of the sliding bottom frame, an intermittent mechanism is arranged on the four-corner opening frames, and a synchronous punching mechanism is arranged on the top surface of the T-shaped opening frame. The punching drill bits are pushed to move in opposite directions through the slotting limiting frames, the punching drill bits punch the lugs on two sides of the two battery cells simultaneously, the punching operation of the battery cells is completed, the punching speed is higher compared with a traditional punching mode, and the punching efficiency of the battery cells is improved.)

1. A power battery cell punching device with an accurate positioning function is characterized by comprising a sliding bottom frame (1), a T-shaped slotting frame (2), four-corner slotting frames (3), an intermittent mechanism (4), a synchronous punching mechanism (40), an intermittent pushing mechanism (5), a limiting mechanism (7), a rotating mechanism (8) and a resetting mechanism (80) for resetting equipment parts; the middle part of the sliding underframe (1) is fixedly provided with a T-shaped perforated frame (2), and two sides of the sliding underframe (1) are provided with chutes for passing through battery cells; two sides of the sliding bottom frame (1) above the T-shaped opening frame (2) are symmetrically provided with two four-corner opening frame (3); the slotted frames (3) at the four corners of the two sides are provided with driving intermittent mechanisms (4); a synchronous punching mechanism (40) is arranged on the left side face above the T-shaped punching frame (2), part of the synchronous punching mechanism (40) is connected with the left side of the sliding bottom frame (1), and the synchronous punching mechanism (40) is used for punching lugs on two sides of two battery cells; the four-corner slotting frame (3) is fixedly provided with an intermittent pushing mechanism (5), and the intermittent pushing mechanism (5) is used for controlling the synchronous punching mechanism (40) to operate; the left end of the sliding groove of the sliding chassis (1) is symmetrically provided with a limiting mechanism (7), the limiting mechanism (7) is used for limiting the battery cell, and two limiting mechanism (7) components are positioned between the corresponding synchronous punching mechanisms (40); a rotating mechanism (8) is arranged above the limiting mechanism (7), and the rotating mechanism (8) rotates while the limiting mechanism (7) operates, so that the battery cell can successfully drop off subsequently; the bottom of the limiting mechanism (7) is provided with a resetting mechanism (80).

2. The punching device with the accurate positioning function for the power battery cell of claim 1, wherein the intermittent mechanism (4) comprises a motor support frame (41), a bidirectional motor (42), a rectangular slotted frame (43), a lower pressing rod (44), a first return spring (45), a sliding rack frame (46), an L-shaped slotted frame (47), a first gear (48), a short shaft (49) and a missing gear (410), the motor support frame (41) is connected between the two four-corner slotted frames (3), the bidirectional motor (42) is fixedly installed on the motor support frame (41), the rectangular slotted frame (43) is fixedly connected to the left end of the four-corner slotted frame (3), the lower pressing rod (44) is vertically and slidably connected to the left part of the rectangular slotted frame (43), the first return spring (45) is fixedly connected to the lower pressing rod (44), one end of the first return spring (45) is connected to the rectangular slotted frame (43), the upper portion of the lower pressing rod (44) is connected with a sliding rack (46), the tooth portion of the sliding rack (46) is perpendicular to the sliding bottom frame (1), the outer side wall of the four-corner slotted frame (3) is fixedly provided with an L-shaped slotted frame (47), the L-shaped slotted frame (47) is connected with a first gear (48) in a rotating mode, the first gear (48) is meshed with the sliding rack (46), short shafts (49) are fixedly connected to the two ends of an output shaft of the two-way motor (42), the short shafts (49) are connected with the four-corner slotted frame (3) in a rotating mode, the short shafts (49) are provided with gear-lacking gears (410), and the gear-lacking gears (410) are meshed with the first gear (48).

3. The power battery cell punching device with the accurate positioning function according to claim 2, characterized in that the synchronous punching mechanism (40) comprises a push rod support block (401), an electric push rod (402), a slotting limit bracket (403), a special-shaped slide rail bracket (404), a punching drill bit (405), a homing spring (406) and a start switch (407), two push rod support blocks (401) are fixedly installed at the left part of the top surface of the T-shaped slotting bracket (2), the electric push rod (402) is fixedly installed on the push rod support blocks (401), the slotting limit bracket (403) is fixedly connected at one end of an expansion shaft of the electric push rod (402), a limit chute is opened at the end of the slotting limit bracket (403), two pairs of special-shaped slide rail brackets (404) are fixedly installed on two side walls of the chute opened on the sliding bottom frame (1), the punching drill bit (405) is slidably connected with the limit chute of the slotting limit bracket (403), a return spring (406) is connected between the punching drill bit (405) and the special-shaped slide rail frame (404), and a starting switch (407) is arranged on the four-corner slotted frame (3).

4. The punching device with the accurate positioning function for the power battery cell according to claim 3, characterized in that the intermittent pushing mechanism (5) comprises a dial wheel (51), a grooved wheel disc (52), a triangular rod (53), an L-shaped grooved rod (54), a special-shaped sliding rod (55) and a second reset spring (56), the dial wheel (51) is fixedly connected to a short shaft (49), the grooved wheel disc (52) is rotatably connected to the four-corner grooved frame (3), the grooved wheel disc (52) is in contact with the dial wheel (51), the triangular rod (53) is fixedly connected to the grooved wheel disc (52), the L-shaped grooved rod (54) is fixedly installed on the four-corner grooved frame (3), the special-shaped sliding rod (55) is slidably connected to the L-shaped grooved rod (54), the special-shaped sliding rod (55) is shifted to move when the triangular rod (53) rotates, the second reset spring (56) is connected to the special-shaped sliding rod (55), one end of a second return spring (56) is fixedly connected with the L-shaped grooved rod (54).

5. The power battery cell punching device with the accurate positioning function according to claim 4, characterized in that the limiting mechanism (7) comprises a special-shaped slotting and punching placing rack (71), an arc placing rack (72), a limiting ring (73), a third reset spring (74), a rectangular fixing rack (75), a limiting wedge block (76), a fourth reset spring (77), a punching connecting rod (78), a swinging wedge rack (79) and a first torsion spring (710), the left end of the sliding chute of the sliding chassis (1) is symmetrically and fixedly connected with the special-shaped slotting and punching placing rack (71), the arc placing rack (72) is rotatably connected to the right side above the special-shaped slotting and punching placing rack (71), the limiting rings (73) are symmetrically connected to two sides of the arc placing rack (72), the limiting ring (73) is shifted by the special-shaped sliding rod (55), the third reset spring (74) is connected between the limiting ring (73) and the arc placing rack (72), arc rack (72) both sides are provided with a pair of rectangle mount (75), all sliding type connection has one spacing wedge (76) on every rectangle mount (75), the hookup has fourth reset spring (77) on spacing wedge (76), fourth reset spring (77) one end and rectangle mount (75) rigid coupling, the equal rigid coupling of the tip of two spacing wedge (76) in top and the tip of two spacing wedge (76) in below has a trompil connecting rod (78), trompil connecting rod (78) go up the rotation type and be connected with swing wedge frame (79), be connected with a pair of first torsion spring (710) between swing wedge frame (79) and trompil connecting rod (78).

6. The power battery cell punching device with the accurate positioning function according to claim 5, characterized in that the rotating mechanism (8) comprises a special-shaped slotted base (81), a second gear (82), a slotted sliding rack (83), a rotating wedge-shaped frame (84), a second torsion spring (85) and a fifth return spring (86), the special-shaped slotted base (81) is fixedly installed at the top of the special-shaped slotted hole-opening placing frame (71), the second gear (82) is arranged on the arc-shaped placing frame (72), the slotted sliding rack (83) is slidably connected on the special-shaped slotted base (81), the slotted sliding rack (83) is meshed with the second gear (82), the rotating wedge-shaped frame (84) is rotatably connected on the slotted sliding rack (83), the rotating wedge-shaped frame (84) is in contact with the special-shaped sliding rod (55), the fifth return spring (86) is connected between the slotted sliding rack (83) and the special-shaped slotted base (81), a pair of second torsion springs (85) are connected between the slotted sliding rack (83) and the rotating wedge-shaped frame (84).

7. The power battery cell punching device with the accurate positioning function according to claim 6, wherein the reset mechanism (80) comprises a T-shaped lower pressing frame (801), a sixth reset spring (802), an L-shaped slide rail frame (803), a wedge-shaped limiting rod (804) and a seventh reset spring (805), the bottom of the special-shaped slotted hole-forming placing frame (71) is slidably connected with the T-shaped lower pressing frame (801), the T-shaped lower pressing frame (801) is fixedly connected with a pair of sixth reset springs (802), one end of each sixth reset spring (802) is connected with the bottom of the special-shaped slotted hole-forming placing frame (71), the L-shaped slide rail frame (803) is fixedly installed on the special-shaped slotted hole-forming placing frame (71), the wedge-shaped limiting rod (804) is slidably connected below the L-shaped slide rail frame (803), the wedge-shaped limiting rod (804) is in contact with the T-shaped lower pressing frame (801), at least one part of the wedge-shaped limiting rod (804) is clamped into a slot of the slotted sliding rack (83), a seventh reset spring (805) is connected between the wedge-shaped limiting rod (804) and the L-shaped slide rail frame (803).

8. The power battery cell punching device with the precise positioning function according to claim 7, the T-shaped drilling machine is characterized by further comprising a conveying mechanism (9), the conveying mechanism (9) is rotatably connected to the upper portion of the T-shaped drilling frame (2), the conveying mechanism (9) comprises belt pulleys (91), conveying belts (92), transmission shafts (93), three gears (94), chains (95) and flitches (96), the belt pulleys (91) are arranged on the short shafts (49), the upper portion of the T-shaped drilling frame (2) is rotatably connected with two pairs of transmission shafts (93), the belt pulleys (91) are fixedly connected to the transmission shafts (93) in the same mode, the conveying belts (92) are connected between the three belt pulleys (91) on the same side in a transmission mode, the three gears (94) on the transmission shafts (93) are fixedly connected with the three gears (94) on the same side in a transmission mode, the chains (95) on the two adjacent chains (95) are connected with the flitches (96) in a uniformly distributed mode.

9. The power battery cell punching device with the accurate positioning function according to claim 8, characterized by further comprising a blanking roller (10), wherein the short shaft (49) is fixedly connected with the blanking roller (10), and the blanking roller (10) is positioned in the four-corner slotted frame (3).

10. The power battery cell punching device with the accurate positioning function according to claim 9, characterized by further comprising a push-out mechanism (12), wherein the push-out mechanism (12) is arranged below the special-shaped slotting and perforating rack (71), the push-out mechanism (12) comprises a Z-shaped slotting frame (121), a first wedge-shaped sliding plate (122), a first extension spring (123), a rectangular four-sided slotting frame (124), a second wedge-shaped sliding plate (125), a second extension spring (126), a wedge-shaped push rod (127) and a third extension spring (128), the Z-shaped slotting frame (121) is fixedly connected to the left end of the rectangular slotting frame (43), the first wedge-shaped sliding plate (122) is slidably connected to the Z-shaped slotting frame (121), the first wedge-shaped sliding plate (122) is in contact with the lower pressing rod (44), the first extension spring (123) is connected between the first wedge-shaped sliding plate (122) and the Z-shaped slotting frame (121), a rectangular four-side slotted frame (124) is fixedly mounted on the left side of the special-shaped slotted hole placing frame (71), a wedge-shaped sliding plate II (125) is connected to the rectangular four-side slotted frame (124) in a liftable mode, the wedge-shaped sliding plate II (125) is in contact with the wedge-shaped sliding plate I (122), a second extension spring (126) is connected between the wedge-shaped sliding plate II (125) and the rectangular four-side slotted frame (124), a wedge-shaped push rod (127) is connected to the lower portion of the special-shaped slotted hole placing frame (71) in a sliding mode, the wedge-shaped push rod (127) is in contact with the wedge-shaped sliding plate II (125), the wedge-shaped push rod (127) is in contact with the special-shaped slotted base (81), a third extension spring (128) is fixedly connected to the wedge-shaped push rod (127), and one end of the third extension spring (128) is connected with the special-shaped slotted hole placing frame (71).

Technical Field

The invention relates to the technical field of lithium ion battery manufacturing, in particular to a power battery cell punching device with an accurate positioning function.

Background

With the increasing severity of energy crisis and environmental deterioration, lithium ion batteries with the advantages of cleanness, environmental protection, high efficiency and the like are increasingly favored by people, and now the lithium ion batteries are widely applied to products such as automobiles, energy storage, electric tools and the like, and in the production application of the lithium ion batteries, the battery core lug is usually processed by laser fixed connection or traditional punching.

The traditional punching method for the battery cell lug mostly adopts an upper and lower vertical punching die structure, after the battery cell is assembled, the battery cell lug is firstly punched in a single-sided mode by a punching die and then is punched in a reverse direction, but the single-sided punching efficiency of the battery cell lug is low one by one, the alignment accuracy of the cell hole sites in the punching process is poor, the consistency is low, and the improvement of the production efficiency and the comprehensive performance of the lithium ion battery is not facilitated.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide the intelligent punching device capable of improving the efficiency of punching the battery cell, ensuring the accurate positioning of the battery cell and accurately positioning the power battery cell with orderly arranged battery cells and realizing the bilateral synchronous horizontal punching, so as to solve the problems that the existing device is low in unilateral punching efficiency of battery cell lugs one by one, poor in cell hole position alignment accuracy in the punching process and low in consistency.

The technical scheme of the invention is as follows: a power battery cell punching device with an accurate positioning function comprises a sliding bottom frame, a T-shaped slotting frame, four-corner slotting frames, an intermittent mechanism, a synchronous punching mechanism, an intermittent pushing mechanism, a limiting mechanism, a rotating mechanism and a resetting mechanism for resetting equipment parts; a T-shaped perforated frame is fixedly arranged in the middle of the sliding underframe; two four-corner slotted frames are symmetrically arranged on two sides of the sliding underframe; the four-corner slotting frame is provided with an intermittent mechanism which is used for providing driving power for the equipment; the top surface of the T-shaped opening frame is provided with a synchronous punching mechanism which is used for punching lugs on two sides of two battery cells, so that the punching speed is increased; the four-corner slotting frame is fixedly provided with an intermittent pushing mechanism which is used for controlling the synchronous slotting mechanism to operate; the left end of the sliding underframe is symmetrically provided with a limiting mechanism which is used for limiting the battery cell, so that the synchronous punching mechanism can accurately position when punching a lug of the battery cell; a rotating mechanism is arranged above the limiting mechanism, and the rotating mechanism rotates the limiting mechanism while the limiting mechanism operates, so that the battery cell can successfully drop off subsequently; and a reset mechanism is arranged at the bottom of the limiting mechanism.

In a preferred embodiment of the invention, the intermittent mechanism comprises a motor supporting frame, a bidirectional motor, a rectangular slotted frame, a lower pressure rod, a first return spring, a sliding rack frame, an L-shaped slotted frame, a first gear, a short shaft and a gear lack, wherein one side of each of the two four-corner slotted frames is fixedly provided with the motor supporting frame, the bidirectional motor is fixedly arranged on the motor supporting frame, the left end of the four-corner slotted frame is fixedly connected with the rectangular slotted frame, the rectangular slotted frame is connected with the lower pressure rod in a lifting manner, the lower pressure rod is fixedly connected with the first return spring, one end of the first return spring is fixedly connected with the rectangular slotted frame, one side of the lower pressure rod is fixedly connected with the sliding rack frame, the L-shaped slotted frame is fixedly arranged on the four-corner slotted frame, the L-shaped slotted frame is rotatably connected with a first gear, the first gear is mutually meshed with the sliding rack frame, the short shaft is fixedly connected with the two ends of an output shaft of the bidirectional motor, and the short shaft is rotatably connected with the four-corner slotted frame, the short shaft is provided with a gear lack, and the gear lack is meshed with the gear I.

In a preferred embodiment of the invention, the synchronous punching mechanism comprises push rod supporting blocks, an electric push rod, a slotting limiting frame, a special-shaped slide rail frame, a punching drill bit, a homing spring and a starting switch, wherein the two push rod supporting blocks are fixedly arranged on the top surface of the T-shaped slotting frame, the electric push rod is fixedly arranged on the push rod supporting blocks, the slotting limiting frame is fixedly connected to one end of an electric push rod telescopic shaft, a limiting chute is formed in the end part of the slotting limiting frame, two pairs of special-shaped slide rail frames are fixedly arranged on the sliding bottom frame, the punching drill bit is connected to the special-shaped slide rail frame in a sliding mode and is connected with the limiting chute of the slotting limiting frame in a sliding mode, the homing spring is connected between the punching drill bit and the special-shaped slide rail frame, and the starting switch is arranged on the four-corner slotting frame.

In a preferred embodiment of the invention, the intermittent pushing mechanism comprises a dial wheel, a slotted wheel disc, a triangular rod, an L-shaped slotted rod, a special-shaped sliding rod and a second return spring, the dial wheel is fixedly connected to the short shaft, the slotted wheel disc is rotatably connected to the four-corner slotted frame, the slotted wheel disc is in contact with the dial wheel, the triangular rod is fixedly connected to the slotted wheel disc, the L-shaped slotted rod is fixedly mounted on the four-corner slotted frame, the special-shaped sliding rod is slidably connected to the L-shaped slotted rod, the special-shaped sliding rod is shifted to move when the triangular rod rotates, the second return spring is connected to the special-shaped sliding rod, and one end of the second return spring is fixedly connected to the L-shaped slotted rod.

In a preferred embodiment of the invention, the limiting mechanism comprises a special-shaped slotted hole placing frame, an arc placing frame, a limiting ring, a third return spring, a rectangular fixing frame, a limiting wedge block, a fourth return spring, a hole connecting rod, a swinging wedge frame and a first torsion spring, the left end of the sliding chassis is symmetrically and fixedly connected with the special-shaped slotted hole placing frame, the arc placing frame is rotatably connected above the special-shaped slotted hole placing frame, the two sides of the arc placing frame are symmetrically and slidably connected with the limiting ring, the special-shaped sliding rod pulls the limiting ring to move, the third return spring is connected between the limiting ring and the arc placing frame, the two sides of the arc placing frame are provided with a pair of rectangular fixing frames, the two horizontal rectangular fixing frames are jointly and slidably connected with the limiting wedge block, the limiting wedge block is connected with the fourth return spring, one end of the fourth return spring is fixedly connected with the rectangular fixing frame, the equal rigid coupling of tip of two spacing wedges in top and two spacing wedges in below's tip has an trompil connecting rod, and the last rotation type of trompil connecting rod is connected with swing wedge frame, is connected with a pair of first torsion spring between swing wedge frame and the trompil connecting rod.

In a preferred embodiment of the invention, the rotating mechanism comprises a special-shaped slotted base, a second gear, a slotted sliding rack, a rotating wedge-shaped frame, a second torsion spring and a fifth return spring, the special-shaped slotted base is fixedly installed at the top of the special-shaped slotted hole placing frame, the second gear is arranged on the arc-shaped placing frame, the slotted sliding rack is slidably connected onto the special-shaped slotted base, the slotted sliding rack is meshed with the second gear, the rotating wedge-shaped frame is rotatably connected onto the slotted sliding rack, the rotating wedge-shaped frame is in contact with the special-shaped sliding rod, the fifth return spring is connected between the slotted sliding rack and the special-shaped slotted base, and a pair of second torsion springs is connected between the slotted sliding rack and the rotating wedge-shaped frame.

In a preferred embodiment of the invention, the reset mechanism comprises a T-shaped lower pressing frame, a sixth reset spring, an L-shaped sliding rail frame, a wedge-shaped limiting rod and a seventh reset spring, the T-shaped lower pressing frame is connected to the bottom of the special-shaped slotting and perforating placing frame in a sliding mode, a pair of sixth reset springs is fixedly connected to the T-shaped lower pressing frame, one end of each sixth reset spring is connected to the bottom of the special-shaped slotting and perforating placing frame, the L-shaped sliding rail frame is fixedly mounted on the special-shaped slotting and perforating placing frame, the wedge-shaped limiting rod is connected to the lower portion of the L-shaped sliding rail frame in a sliding mode, the wedge-shaped limiting rod is in contact with the T-shaped lower pressing frame, at least one part of the wedge-shaped limiting rod is clamped into the slotting sliding rack slot, and the seventh reset spring is connected between the wedge-shaped limiting rod and the L-shaped sliding rail frame.

In a preferred embodiment of the invention, the device further comprises a conveying mechanism, the conveying mechanism is rotatably connected above the T-shaped opening frame, the conveying mechanism comprises belt pulleys, conveying belts, transmission shafts, three gears, chains and flitches, the belt pulleys are arranged on the short shafts, two pairs of transmission shafts are rotatably connected above the T-shaped opening frame, the belt pulleys are fixedly connected to the transmission shafts in the same way, the conveying belts are connected between the three belt pulleys on the same side in a common transmission manner, the three gears are fixedly connected to the transmission shafts, the chains are connected to the two gears three on the same side in a common transmission manner, and the flitches are connected to the two adjacent chains in a common uniform arrangement manner.

In a preferred embodiment of the present invention, the device further comprises a blanking roller, wherein the short shaft is fixedly connected with the blanking roller, and the blanking roller is positioned in the four-corner slotted frame.

In a preferred embodiment of the invention, the pushing mechanism is arranged below the special-shaped slotting and perforating rack and comprises a Z-shaped slotting rack, a first wedge-shaped sliding plate, a first extension spring, a rectangular four-side slotting rack, a second wedge-shaped sliding plate, a second extension spring, a wedge-shaped push rod and a third extension spring, wherein the left end of the rectangular slotting rack is fixedly connected with the Z-shaped slotting rack, the Z-shaped slotting rack is slidably connected with a first wedge-shaped sliding plate which is contacted with a lower pressing rod, the first extension spring is connected between the first wedge-shaped sliding plate and the Z-shaped slotting rack, the rectangular four-side slotting rack is fixedly arranged at the left side of the special-shaped slotting and perforating rack, the second wedge-shaped sliding plate is connected on the rectangular four-side slotting rack in a lifting manner, the second wedge-shaped sliding plate is contacted with the first wedge-shaped sliding plate, and the second extension spring is connected between the second wedge-shaped sliding plate and the rectangular four-side slotting rack, the wedge-shaped pushing rod is in contact with the wedge-shaped sliding plate II, the wedge-shaped pushing rod is in contact with the special-shaped slotting base, a third extension spring is fixedly connected to the wedge-shaped pushing rod, and one end of the third extension spring is connected with the special-shaped slotting and perforating rack.

Compared with the prior art, the invention has the following advantages:

through spacing ring court near four corners fluting frame direction motion, make spacing wedge motion in opposite directions block spacing ring for spacing ring can block battery electricity core, carries on spacingly to battery electricity core, reaches the purpose with battery electricity core accurate positioning.

The punching drill bits are pushed to move in opposite directions through the slotting limiting frames, the punching drill bits punch the lugs on two sides of the two battery cells simultaneously, the punching operation of the battery cells is completed, the punching speed is higher compared with a traditional punching mode, and the punching efficiency of the battery cells is improved.

Can learn according to the number of teeth of slotted slip rack and gear two, gear two drives arc rack and the last device and rotates ninety degrees, is convenient for make the battery electricity core of accomplishing the operation of punching a hole drop.

Promote battery electricity core through wedge catch bar and move towards being close to four corners fluting frame direction, push away battery electricity core to the slip chassis on, make battery electricity core arrange in order, avoid battery electricity core to arrange in a jumble, reduce follow-up work load.

Drawings

Fig. 1 is a schematic perspective view of a first embodiment of the present invention.

Fig. 2 is a schematic perspective view of a second embodiment of the present invention.

FIG. 3 is a schematic view of a first partial body structure according to the present invention.

Fig. 4 is a schematic view of a first partial body structure of the intermittent mechanism of the present invention.

Fig. 5 is an enlarged schematic view of the intermittent mechanism a of the present invention.

FIG. 6 is a schematic view of a second partial body structure according to the present invention.

Fig. 7 is a partially disassembled three-dimensional structure diagram of the synchronous punching mechanism of the present invention.

FIG. 8 is an enlarged schematic view of the present invention B.

Fig. 9 is a schematic separated perspective view of the rotating mechanism of the present invention.

Fig. 10 is a partially disassembled perspective view of the spacing mechanism of the present invention.

Fig. 11 is a schematic perspective view of the reset mechanism of the present invention.

Fig. 12 is a schematic perspective view of the conveying mechanism of the present invention.

Fig. 13 is a schematic view of a second partial body structure of the intermittent mechanism of the present invention.

Fig. 14 is a schematic separated perspective view of the pushing mechanism of the present invention.

Wherein the figures include the following reference numerals: 1. a sliding chassis, 2, a T-shaped slotted frame, 3, a four-corner slotted frame, 4, an intermittent mechanism, 41, a motor supporting frame, 42, a bidirectional motor, 43, a rectangular slotted frame, 44, a lower pressing rod, 45, a first return spring, 46, a sliding rack frame, 47, an L-shaped slotted frame, 48, a first gear, 49, a short shaft, 410, a missing gear, 40, a synchronous punching mechanism, 401, a push rod supporting block, 402, an electric push rod, 403, a slotted limiting frame, 404, a special-shaped slide rail frame, 405, a punching drill bit, 406, a homing spring, 407, a starting switch, 5, an intermittent pushing mechanism, 51, a dial wheel, 52, a sheave disc, 53, a triangular rod, 54, an L-shaped slotted rod, 55, a special-shaped slide rod, 56, a second return spring, 7, a limiting mechanism, 71, a special-shaped slotted hole placing frame, 72, an arc placing frame, 73, a limiting ring, 74 and a third return spring, 75. 76, a limiting wedge block, 77, a fourth return spring, 78, a perforated connecting rod, 79, a swinging wedge frame, 710, a first torsion spring, 8, a rotating mechanism, 81, a special-shaped slotted base, 82, a second gear, 83, a slotted sliding rack, 84, a rotating wedge frame, 85, a second torsion spring, 86, a fifth return spring, 80, a return mechanism, 801, a T-shaped lower pressing frame, 802, a sixth return spring, 803, an L-shaped sliding rail frame, 804, a wedge limiting rod, 805, a seventh return spring, 9, a conveying mechanism, 91, a belt pulley, 92, a conveying belt, 93, a transmission shaft, 94, a third gear, 95, a chain, 96, a flitch, 10, a blanking roller, 12, a pushing mechanism, 121, a Z-shaped slotted frame, 122, a first wedge sliding plate, 123, a first extension spring, 124, a rectangular four-side slotted frame, 125, a second wedge sliding plate, 126, a special-shaped slotted base, 82, a second gear, a sixth return spring, a third return spring, a fourth return spring, a third return spring, a fourth torsion spring, 8, a fourth return spring, a fourth torsion spring, a fourth return spring, a fourth torsion spring, a sixth return spring, a sixth return spring, a sixth return spring, a sixth return, A second extension spring 127, a wedge-shaped push rod 128 and a third extension spring.

Detailed Description

The standard parts used in the invention can be purchased from the market, the special-shaped parts can be customized according to the description of the specification and the description of the attached drawings, and the specific connection mode of each part adopts the conventional means of mature bolts, rivets, fixed connection, sticking and the like in the prior art, and the detailed description is not repeated.

Example 1

A power battery core punching device with accurate positioning function, which comprises a sliding bottom frame 1, a T-shaped slotting frame 2, four-corner slotting frames 3 and an intermittent mechanism 4 as shown in figures 1-11, synchronous punching mechanism 40, intermittent type pushing mechanism 5, stop gear 7, rotary mechanism 8 and canceling release mechanical system 80, 1 middle part fixed mounting of slip chassis has T type trompil frame 2, 1 bilateral symmetry of slip chassis is provided with two four corners slotting machines 3, be provided with intermittent type mechanism 4 on the slotting machine 3 in four corners, 2 top surfaces of T type slotting machines are provided with the synchronous punching mechanism 40 that is used for punching to battery electricity core, fixed mounting has intermittent type pushing mechanism 5 on the slotting machine 3 in four corners, 1 left end symmetry of slip chassis is provided with stop gear 7, stop gear 7 is used for spacing battery electricity core, stop gear 7 top is provided with rotary mechanism 8, stop gear 7 bottom is provided with canceling release mechanical system 80.

The intermittent mechanism 4 comprises a motor supporting frame 41, a bidirectional motor 42, a rectangular slotted frame 43, a lower pressing rod 44, a first return spring 45, a sliding rack frame 46, an L-shaped slotted frame 47, a first gear 48, a short shaft 49 and a missing gear 410, wherein the motor supporting frame 41 is fixedly arranged on one side of each of the two four-corner slotted frames 3, the bidirectional motor 42 is fixedly arranged on the motor supporting frame 41, the rectangular slotted frame 43 is fixedly connected with the left end of each of the four-corner slotted frames 3, the rectangular slotted frame 43 far away from the four-corner slotted frame 3 is connected with a lower pressing rod 44 in a lifting mode, the lower pressing rod 44 is fixedly connected with a first return spring 45, one end of the first return spring 45 far away from the lower pressing rod 44 is fixedly connected with the rectangular slotted frame 43, the sliding rack frame 46 is fixedly connected with one side of the lower pressing rod 44, the L-shaped slotted frame 47 is fixedly arranged on the four-corner slotted frame 3, the L-shaped slotted frame 47 is connected with the first gear 48 in a rotating mode, the first gear 48 is meshed with the sliding rack 46, the two ends of the output shaft of the bidirectional motor 42 are fixedly connected with short shafts 49, the short shafts 49 are rotatably connected with the four-corner slotted frame 3, the short shafts 49 are provided with gear-lacking gears 410, and the gear-lacking gears 410 are meshed with the first gear 48.

The synchronous punching mechanism 40 comprises a push rod supporting block 401, an electric push rod 402, a slotting limiting frame 403, a special-shaped slide rail frame 404, a punching drill bit 405, a homing spring 406 and a starting switch 407, wherein the top surface of the T-shaped slotting frame 2 is fixedly provided with the two push rod supporting blocks 401, the push rod supporting blocks 401 are fixedly provided with the electric push rod 402, one end of a telescopic shaft of the electric push rod 402 is fixedly connected with the slotting limiting frame 403, two ends of the slotting limiting frame 403 are provided with limiting chutes, the sliding bottom frame 1 is fixedly provided with two pairs of special-shaped slide rail frames 404, the special-shaped slide rail frames 404 are slidably connected with the punching drill bit 405, the punching drill bit 405 is used for punching the lugs at the two sides of the two battery cells, the punching drill bit 405 is slidably connected with the limiting chutes of the slotting limiting frame 403, the slotting limiting frame 403 is used for pushing the punching drill bit 405 to move, the homing spring 406 is connected between the punching drill bit 405 and the special-shaped slide rail frames 404, the starting switch 407 is arranged on the four-corner slotting frame 3, the start switch 407 is used to control the extension and contraction of the electric putter 402.

The intermittent pushing mechanism 5 comprises a dial wheel 51, a grooved wheel 52, a triangular rod 53, an L-shaped grooved rod 54, a special-shaped sliding rod 55 and a second return spring 56, the dial wheel 51 is fixedly connected to the short shaft 49, the grooved wheel 52 is rotatably connected to the four-corner slotted frame 3 close to the short shaft 49, the grooved wheel 52 is in contact with the dial wheel 51, the triangular rod 53 is fixedly connected to the grooved wheel 52, the L-shaped grooved rod 54 is fixedly mounted on the four-corner slotted frame 3, the special-shaped sliding rod 55 is slidably connected to the L-shaped grooved rod 54, the special-shaped sliding rod 55 is pushed to move when the triangular rod 53 rotates, the triangular rod 53 is used for pushing the special-shaped sliding rod 55 to move towards the direction close to the four-corner slotted frame 3, the second return spring 56 is connected to the special-shaped sliding rod 55, and one end of the second return spring 56 far away from the special-shaped sliding rod 55 is fixedly connected to the L-shaped slotted rod 54.

The limiting mechanism 7 comprises a special-shaped slotted hole-forming placing frame 71, an arc-shaped placing frame 72, a limiting circular ring 73, a third reset spring 74, a rectangular fixing frame 75, a limiting wedge-shaped block 76, a fourth reset spring 77, a hole-forming connecting rod 78, a swinging wedge-shaped frame 79 and a first torsion spring 710, the left end of the sliding bottom frame 1 is symmetrically and fixedly connected with the special-shaped slotted hole-forming placing frame 71, the arc-shaped placing frame 72 is rotatably connected above the special-shaped slotted hole-forming placing frame 71, the limiting circular rings 73 are symmetrically and slidably connected on two sides of the arc-shaped placing frame 72, the limiting circular rings 73 are used for blocking battery cells, the limiting circular ring 73 is moved by stirring when the special-shaped sliding rod 55 moves, the special-shaped sliding rod 55 is used for pushing the limiting circular ring 73 to move towards the direction close to the four-corner slotted hole frame 3, the third reset spring 74 is connected between the limiting circular ring 73 and the arc-shaped placing frame 72, and a pair of rectangular fixing frames 75 are arranged on two sides of the arc-shaped placing frame 72, two rectangle mounts 75 of same level go up common sliding type connection with spacing wedge 76, the hookup has fourth reset spring 77 on the spacing wedge 76, keep away from fourth reset spring 77 one end and the rectangle mount 75 rigid coupling of spacing wedge 76, the equal rigid coupling of tip of two spacing wedges 76 in the tip of two spacing wedges 76 in top and the tip of two spacing wedges 76 in below has a trompil connecting rod 78, trompil connecting rod 78 goes up the rotation type and is connected with swing wedge frame 79, be connected with a pair of first torsion spring 710 between swing wedge frame 79 and the trompil connecting rod 78.

The rotating mechanism 8 comprises a special-shaped slotted base 81, a second gear 82, a slotted sliding rack 83, a rotating wedge-shaped frame 84, a second torsion spring 85 and a fifth return spring 86, the special-shaped slotted base 81 is fixedly installed at the top of the special-shaped slotted hole placing frame 71, the second gear 82 is arranged on the arc-shaped placing frame 72 close to the special-shaped slotted hole placing frame 71, the special-shaped slotted base 81 is connected with the slotted sliding rack 83 in a sliding mode, the slotted sliding rack 83 is meshed with the second gear 82, the rotating wedge-shaped frame 84 is connected to the slotted sliding rack 83 in a rotating mode, the rotating wedge-shaped frame 84 is in contact with the special-shaped sliding rod 55, the fifth return spring 86 is connected between the slotted sliding rack 83 and the special-shaped slotted base 81, and the pair of second torsion springs 85 is connected between the slotted sliding rack 83 and the rotating wedge-shaped frame 84.

The reset mechanism 80 comprises a T-shaped lower pressing frame 801 and a sixth reset spring 802, the T-shaped lower pressing frame 71 is connected to the bottom of the special-shaped slotted hole placing frame 71 far away from the arc placing frame 72 in a sliding mode, the T-shaped lower pressing frame 801 is fixedly connected with a pair of sixth reset springs 802, one end of each sixth reset spring 802 far away from the T-shaped lower pressing frame 801 is connected with the bottom of the special-shaped slotted hole placing frame 71, the L-shaped sliding rail frame 803 is fixedly installed on the special-shaped slotted hole placing frame 71 close to the T-shaped lower pressing frame 801, the wedge-shaped limiting rod 804 is connected below the L-shaped sliding rail frame 803 in a sliding mode, the wedge-shaped limiting rod 804 is in contact with the T-shaped lower pressing frame 801, at least one part of the wedge-shaped limiting rod 804 is clamped into the slotted sliding rack 83 slot, the wedge-shaped limiting rod 804 is used for clamping the slotted sliding rack 83, and the seventh reset spring 805 is connected between the wedge-shaped limiting rod 804 and the L-shaped sliding rail frame 803.

When the battery cores need to be punched, a worker places the two battery cores on the arc-shaped placing frame 72, the worker starts the two-way motor 42 to rotate reversely, the output shaft of the two-way motor 42 rotates to drive the short shaft 49 and the upper device thereof to rotate, the short shaft 49 drives the gear lacking 410 to rotate reversely, the tooth part of the gear lacking 410 is meshed with the gear one 48, the thickness of the gear one 48 is larger than that of the gear lacking 410, the gear one 48 rotates forwardly to drive the rack 46 meshed therewith to move downwards, the rack 46 drives the lower pressing rod 44 to move downwards, the lower pressing rod 44 moves downwards to compress the first return spring 45, the lower pressing rod 44 cannot be in contact with the swinging wedge-shaped frame 79, and after the subsequent arc-shaped placing frame 72 and the upper device thereof rotate ninety degrees, the lower pressing rod 44 can push the swinging wedge-shaped frame 79 to swing. When the gear lacking 410 is separated from the first gear 48, the compressed first return spring 45 drives the lower pressing rod 44 and the sliding rack 46 to move upwards for returning, so that the next process is conveniently carried out, and the intermittent mechanism 4 drives the limiting mechanism 7 through linkage, so that the devices are matched with each other in operation.

When missing gear 410 and gear 48 and separating, dial wheel 51 rotates and can promote channel wheel dish 52 and triangle pole 53 and rotate, the triangle pole 53 is rotatory can stir heterotypic slide bar 55 towards being close to 3 direction movements of four corners slotted frame, heterotypic slide bar 55 can promote spacing ring 73 towards the direction movement that arc rack 72 placed the battery electric core when being close to 3 direction movements of four corners slotted frame, both ends can promote spacing wedge 76 withdrawal about spacing ring 73, when spacing ring 73 moves to wedge 76 opposite side, compressed fourth reset spring 77 drives spacing wedge 76 and resets and blocks spacing ring 73, spacing ring 73 ring position can block the battery electric core this moment, spacing ring 73 ring position is spacing to the battery electric core. Meanwhile, the special-shaped sliding rod 55 can push the rotating wedge-shaped frame 84 to swing, when the special-shaped sliding rod 55 is separated from the rotating wedge-shaped frame 84, the compressed second torsion spring 85 resets to drive the rotating wedge-shaped frame 84 to swing and reset, so that the special-shaped sliding rod 55 can only push the rotating wedge-shaped frame 84 when moving towards the direction close to the four-corner slotting frame 3, and the function that the intermittent mechanism 4 drives the rotating mechanism 8 to move through linkage is realized.

The special-shaped sliding rod 55 presses the starting switch 407 when moving towards the direction close to the four-corner slotting frame 3, the starting switch 407 controls the electric push rod 402 to contract, the electric push rod 402 contracts to drive the slotting limiting frame 403 to move towards the direction close to the four-corner slotting frame 3, the limiting sliding grooves on the two sides of the slotting limiting frame 403 push the punching drill bits 405 to move towards each other when moving towards the direction close to the four-corner slotting frame 3, and the punching drill bits 405 moving towards each other punch holes on the lugs on the two sides of the battery cell. Subsequently, the electric push rod 402 extends to drive the slotting limit frame 403 to move towards the direction away from the four-corner slotting frame 3, the slotting limit frame 403 pushes the punching drill 405 to move relatively, the punching drill 405 does not punch holes on the battery cell any more, and thus the function of simultaneously punching holes on two sides of the battery cell is realized.

When the triangular rod 53 is separated from the special-shaped sliding rod 55, the stretched second return spring 56 is reset to drive the special-shaped sliding rod 55 to move in the direction away from the four-corner slotting frame 3, the special-shaped sliding rod 55 is separated from the limiting ring 73, the rotary wedge-shaped frame 84 is blocked by the slotting sliding rack 83, the special-shaped sliding rod 55 can push the rotary wedge-shaped frame 84 and the upper device thereof to move oppositely, the slotting sliding rack 83 drives the second gear 82 and the upper device thereof to rotate, and the second gear 82 drives the arc-shaped placing frame 72 and the upper device thereof to rotate ninety degrees according to the tooth number of the slotting sliding rack 83 and the second gear 82, so that a battery cell completing punching operation can fall off conveniently. The opposite movement of the slotted sliding rack 83 pushes the wedge-shaped limiting rod 804 to move towards the direction far away from the four-corner slotted frame 3, and the compressed seventh reset spring 805 resets to drive the wedge-shaped limiting rod 804 to move towards the direction close to the four-corner slotted frame 3 for resetting, so that the wedge-shaped limiting rod 804 clamps the slotted sliding rack 83.

Then, the third gear 410 is meshed with the first gear 48 again, and the above operations are repeated, the pressing rod 44 contacts with the swinging wedge-shaped frame 79, the pressing rod 44 pushes the swinging wedge-shaped frame 79 to swing, and the compressed first torsion spring 710 is reset to drive the swinging wedge-shaped frame 79 to swing and reset. When the lower pressing rod 44 moves upwards, the lower pressing rod 44 can push the swinging wedge-shaped frame 79 and the upper device thereof to move oppositely, the limiting wedge-shaped block 76 does not block the limiting ring 73 any more, the compressed third reset spring 74 resets to drive the limiting ring 73 to move and reset towards the direction far away from the four-corner slotted frame 3, the limiting ring 73 does not block the battery cell, the battery cell drops downwards to the special-shaped slotted hole placing frame 71 under the influence of gravity, the battery cell can push the T-shaped lower pressing frame 801 to move downwards, the T-shaped lower pressing frame 801 pushes the wedge-shaped limiting rod 804 to move towards the direction far away from the four-corner slotted frame 3, the wedge-shaped limiting rod 804 no longer clamps the slotted sliding rack 83, the compressed fifth reset spring 86 resets to drive the slotted sliding rack 83 and the upper device thereof to move relatively, and the slotted sliding rack 83 drives the second gear 82 and the upper device thereof to rotate and reset ninety degrees. The staff takes away the battery cell that will accomplish the punching operation from heterotypic fluting trompil rack 71, is reset by tensile sixth reset spring 802 and drives T type pushing frame 801 upward movement down, and the seventh reset spring 805 of compressed resets and drives wedge gag lever post 804 and reset towards being close to the 3 direction movements of four corners fluting frame, and wedge gag lever post 804 blocks fluting slip rack 83 again, repeats above-mentioned operation, carries out the work of punching a hole to battery cell utmost point ear.

Example 2

Based on embodiment 1, as shown in fig. 12 to 13, the battery pack further includes a conveying mechanism 9, the conveying mechanism 9 is rotatably connected above the T-shaped rack 2, the conveying mechanism 9 is used for conveying the battery cells, the conveying mechanism 9 includes a pulley 91, a conveying belt 92, and a transmission shaft 93, gear three 94, chain 95 and flitch 96, be provided with belt pulley 91 on the minor axis 49, 2 top rotary types of T type trompil frame are connected with two pairs of transmission shafts 93, the same rigid coupling has belt pulley 91 on the transmission shaft 93, common transmission type is connected with the conveyer belt 92 that is used for transmitting power between three belt pulleys 91 of homonymy, the rigid coupling has three 94 of two gears on the transmission shaft 93, common transmission type is connected with chain 95 on two gears three 94 of homonymy, it is connected with flitch 96 to be the mode of evenly arranging jointly on two adjacent chains 95, flitch 96 is used for carrying battery electricity core to arc rack 72 on.

Still including unloading gyro wheel 10, the rigid coupling has unloading gyro wheel 10 on the minor axis 49, and unloading gyro wheel 10 is used for carrying the battery electricity core of four corners slotting machine 3 top to its below, and unloading gyro wheel 10 is located four corners slotting machine 3.

Carry battery cell to four corners slotted frame 3 in one by other unloader, minor axis 49 rotates and can drive unloading gyro wheel 10 and rotate, and unloading gyro wheel 10 rotates and can carry the battery cell of top to four corners slotted frame 3 below, and battery cell drops to on flitch 96 from 3 feed openings in four corners slotted frame. Simultaneously minor axis 49 rotates and drives belt pulley 91 and rotate to belt pulley 91 passes through conveyer belt 92 and drives transmission shaft 93 and three 94 rotations of gear, and then three 94 drive chains 95 of gear and flitch 96 rotate, makes flitch 96 carry battery electricity core to arc rack 72 on, replaces artifical manual battery electricity core of placing, improves production efficiency.

Example 3

Based on embodiment 2, as shown in fig. 14, the battery pack further includes a push-out mechanism 12, the push-out mechanism 12 is disposed below the special-shaped slotted hole placement frame 71, the push-out mechanism 12 is configured to push the battery cells into the sliding slots on the sliding bottom frame 1, the push-out mechanism 12 includes a Z-shaped slotted frame 121, a first wedge-shaped sliding plate 122, a first extension spring 123, a rectangular four-sided slotted frame 124, a second wedge-shaped sliding plate 125, a second extension spring 126, a wedge-shaped push rod 127, and a third extension spring 128, the left end of the rectangular slotted frame 43 is fixedly connected with the Z-shaped slotted frame 121, the Z-shaped slotted frame 121 is slidably connected with a first wedge-shaped sliding plate 122, the first wedge-shaped sliding plate 122 and the lower push rod 44 are in contact with each other, the lower push rod 44 is configured to push the first wedge-shaped sliding plate 122 to move in a direction away from the four-sided slotted frame 3, the first extension spring 123 is connected between the first wedge-shaped sliding plate 122 and the Z-shaped slotted frame 121, the left side of the special-shaped slotted hole placement frame 71 is fixedly installed with a rectangular four-sided slotted frame 124, a second wedge-shaped sliding plate 125 is connected to the rectangular four-side slotted frame 124 in a lifting manner, the second wedge-shaped sliding plate 125 is in contact with the first wedge-shaped sliding plate 122, the first wedge-shaped sliding plate 122 is used for pushing the second wedge-shaped sliding plate 125 to move downwards, a second extension spring 126 is connected between the second wedge-shaped sliding plate 125 and the rectangular four-side slotted frame 124, a wedge-shaped push rod 127 is connected below the special-shaped slotted hole placing frame 71 close to the rectangular four-side slotted frame 124 in a sliding manner, the wedge-shaped push rod 127 is used for pushing a battery cell into a sliding groove on the sliding bottom frame 1, the wedge-shaped push rod 127 is in contact with the second wedge-shaped sliding plate 125, the second wedge-shaped sliding plate 125 is used for pushing the wedge-shaped push rod 127 to move towards the direction close to the four-side slotted frame 3, the wedge-shaped push rod 127 is in contact with the slotted special-shaped slotted base 81, a third extension spring 128 is fixedly connected to the wedge-shaped push rod 127, and one end of the third extension spring 128 far away from the wedge-shaped push rod 127 is connected with the special-shaped slotted hole placing frame 71.

When the lower pressing rod 44 moves downwards, the lower pressing rod 44 is separated from the first wedge-shaped sliding plate 122, the first stretching spring 123 in a stretching state resets to drive the first wedge-shaped sliding plate 122 to move towards the direction close to the four-corner slotted frame 3, the first wedge-shaped sliding plate 122 is separated from the second wedge-shaped sliding plate 125, the second stretching spring 126 in a stretching state resets to drive the second wedge-shaped sliding plate 125 to move upwards, the second wedge-shaped sliding plate 125 is separated from the wedge-shaped pushing rod 127, and the stretched third stretching spring 128 resets to drive the wedge-shaped pushing rod 127 to move towards the direction far from the four-corner slotted frame 3. When the lower pressing rod 44 moves upwards, the lower pressing rod 44 pushes the first wedge-shaped sliding plate 122 to move towards the direction far away from the four-corner slotting frame 3, so that the first wedge-shaped sliding plate 122 pushes the second wedge-shaped sliding plate 125 to move downwards, and then the second wedge-shaped sliding plate 125 pushes the wedge-shaped pushing rod 127 to move towards the direction close to the four-corner slotting frame 3, so that the wedge-shaped pushing rod 127 pushes the battery cells to move towards the direction close to the four-corner slotting frame 3, the battery cells are pushed into the sliding grooves in the sliding bottom frame 1, the battery cells are arranged in order, the disordered arrangement of the battery cells is avoided, and the subsequent workload is reduced.

The intermittent mechanism 4 can simultaneously drive the synchronous punching mechanism 40 and the limiting mechanism 7 to operate, so that the limiting mechanism 7 and the synchronous punching mechanism 40 operate in a matched mode, power sources are saved, and the pushing mechanism 12 can be driven by the lower pressing rod 44 to operate.

The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.